author | hgs |
Mon, 09 Aug 2010 10:51:30 +0530 | |
changeset 14 | 8bd192d47aaa |
parent 0 | 671dee74050a |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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|
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#ifndef CPIX_CPIX_ASYNC_H |
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#define CPIX_CPIX_ASYNC_H |
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|
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#include "cpixidxdb.h" |
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#include "cpixsearch.h" |
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|
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/**************************************************************** |
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* |
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* O V E R V I E W |
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* |
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* CPix API for some asynchronous API operations (not all sync |
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* operations have async conterparts). All async operations are |
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* semantically equivalent to their synchronous brethren, they just |
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* happen to be asynchronous. For sample function |
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* |
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* "int cpix_Foo_bar(cpix_Foo * thisFoo, |
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* int arg);" |
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* |
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* The following async function will be created: |
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* |
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* "cpix_JobId cpix_Foo_asyncBar(cpix_Foo * thisFoo, |
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* int arg, |
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* void * cookie, |
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* void (* callback)(void *, cpix_JobId));" |
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* |
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* Argument thisFoo has the same meaning in both the sync and the |
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* async version: the operation "bar(int)" is performed on that |
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* object. If there is an error during creating the async job itself, |
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* the error is reported on thisFoo. |
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* |
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* Hypothetical argument "arg" has the exact same meaning: some argument |
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* for "bar(int)". |
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* |
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* Argument "cookie" is some client specific data that the client |
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* wants to see as an argument given to the callback in the async |
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* version - to be able to identify the request. |
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* |
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* Argument "callback" is a callback function that can conceptually |
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* give kick the caller with the given cookie and the job id that was |
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* allocated for the job. The arguments given to the callback will be |
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* the cookie and the job id that has been completed. The callback |
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* should be doing no serious processing of the results, only some |
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* administrative work to signal some party to collect the results. |
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* |
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* Normally, once the asyncBar has kicked the callback, the client can |
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* come and collect the results of the async operation 'bar', like |
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* |
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* int cpix_Foo_asyncBarResults(cpix_Foo * thisFoo, |
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* cpix_JobId jobId); |
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* |
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* Where the return value is given there as well as error status is |
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* communicated through thisFoo. For all (non-cancellable) async |
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* functions calls, there must be a corresponding result-collection |
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* call. Such result collection call must be done only after the |
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* callback has been called by the worker. DO NOT collect the results |
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* as part of the callback. |
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* |
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* NOTE, that the job-creation itself may fail, that is, the call to |
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* cpix_Foo_asuyncBar may report error on thisFoo. In that case the |
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* job was not created, there is no need to cancel or collect the |
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* results. |
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* |
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* Some async operations are cancellable. |
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* |
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* Calling cancel on an object (cpix_IdxDb*, cpix_IdxSearcher* or |
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* cpix_Hits*) will guarantee that the callback is not called for the |
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* client object once the cancel function returns. For all cancellable |
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* async function calls, there must be either a cancel or a |
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* result-collection call. Cancel operations can be called any time, |
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* even before the callback has been called by the worker. |
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* |
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* Instances of cpix_IdxDb and cpix_IdxSearcher should not be deleted |
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* before either cancel() or cpix_XXX_asyncXXXResults() is |
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* called. Argument instances like cpix_Document, cpix_Analyzer, |
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* cpix_Query can be immediately released by the client call. |
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* |
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* Any argument that is an object (like cpix_Document*, const |
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* wchar_t*, ...) can be immediately discarded by the client after a |
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* call to cpix_XXX_cancelMMM(): those instances are either cloned or |
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* have reference counted lifetime management. |
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* |
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* NOTE: |
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* |
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* 1 Don't ever use the same cpix_IdxDb or cpix_IdxSearch instance |
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* from multiple threads. These objects themselves are not |
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* thread-safe. |
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* |
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* 2 You should be able to use different cpix_IdxDb instances that |
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* actually manage the same underlyng physical index volume - that |
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* should work. |
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* |
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* 3 Make absolutely certain that you clear the error status on |
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* cpix_Foo on all async operations (like cpix_Foo_asyncBar, |
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* cpix_foo_asyncBarResults, cpix_Foo_cancel()). Failure to do so |
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* may result in leaking error-status objects. (Obviously, you |
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* should check the error status on cpix_Foo anyway after all calls |
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* anyway.) To clear the error status, use macro cpix_ClearError |
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* from cpixerror.h. |
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* |
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* 4 If you use an async version of an operation, then you MUST use |
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* the async version of each operation where available. |
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* |
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* That means that once you use (any of) this ASYNC api, you must |
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* never call any of these functions: |
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* |
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* cpix_IdxDb_add, |
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* cpix_IdxDb_deleteDocuments, |
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* cpix_IdxDb_update, |
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* cpix_IdxDb_flush, |
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* cpix_IdxDb_doHousekeeping, |
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* cpix_IdxDb_search, |
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* cpix_IdxSearcher_search, |
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* cpix_Hits_doc. |
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* |
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* |
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* RULES concerning cancel(), cpix_XXX_asyncXXXResults() |
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* (results(), for short) and callback(): |
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* |
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* 1 Once cancel() returns, callback() will not occur. |
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* |
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* 2 There must be exactly one of these calls: cancel() and |
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* results(). There can be no duplicate cancels() or calling |
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* results() after cancel() has been called. |
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* |
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* 3 results() give back results, possibly transferring ownership of |
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* resulting instances to the client, but cancel() makes sure that |
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* all resources related to the job are released. |
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* |
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* 4 Therefore once a call to cancel() has been made, you must not |
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* attempt to try to collect the results by calling result(). |
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* |
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* 5 callback() may occur any time before cancel() returns. It can |
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* happen that the client is already in the cancel() call, and |
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* during that time callback() happens. In that case, the client |
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* must clear the called back status, and make sure that the |
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* results() are not called by mistake. |
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*/ |
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|
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|
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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|
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|
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/** |
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* Every asynchronous job will have an ID allocated, one must |
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* collect the result of the job / cancel it referring to that ID. |
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*/ |
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typedef size_t cpix_JobId; |
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|
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|
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/** |
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* Callback type to signal the client that the operation has |
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* completed. Normally, after the callback, the client would |
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* proceed to collect the error status and possible return values. |
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*/ |
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typedef void cpix_AsyncCallback(void * cookie, |
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cpix_JobId jobId); |
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|
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|
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|
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|
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/** |
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* Each cancel operation returns how the cancel request was |
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* handled. Useful for development purposes (logging and observing |
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* clien behaviour) but has no real benefit for end user. |
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*/ |
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enum cpix_CancelAction_ |
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{ |
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/** |
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* If the cancel request while the request was still |
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* pending in the job queue - the job was killed even |
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* before it could have started. |
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*/ |
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cpix_CANCEL_SHALLOW, |
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|
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/** |
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* The cancel request cam exactly while the job was being |
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* executed - the job was interrupted and killed that way. |
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*/ |
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cpix_CANCEL_DEEP, |
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|
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/** |
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* The cancel request came after the job was already done. |
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*/ |
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cpix_CANCEL_JOBDONE, |
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|
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/** |
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* Unknown error during cancel. |
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*/ |
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cpix_CANCEL_ERROR |
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}; |
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typedef cpix_CancelAction_ cpix_CancelAction; |
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|
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|
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/*************************************************************** |
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* |
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* A S Y N C F U N C T I O N S |
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* |
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*/ |
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/** |
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* Corresponding sync function: cpix_IdxDb_add (cpixidxdb.h), see |
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* overview and description for params 'thisIdxDb', 'document' and |
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* 'analyzer' there. Error status is signaled on thisIdxDb right |
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* away if the very creation of the asynchronous job has |
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* failed. In that case, you can't collect the results of the |
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* operation. |
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* |
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* For a general description of parameters 'cookie' and |
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* 'callback', see the OVERVIEW comment above. |
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* |
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* @return the job id of the created job, if successful |
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*/ |
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cpix_JobId cpix_IdxDb_asyncAdd(cpix_IdxDb * thisIdxDb, |
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cpix_Document * document, |
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cpix_Analyzer * analyzer, |
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void * cookie, |
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cpix_AsyncCallback * callback); |
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|
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|
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/** |
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* Collects the results on the completed async add operation on |
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* thisIdxDb. Error status of the job execution is signalled on |
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* thisIdxDb. |
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*/ |
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void cpix_IdxDb_asyncAddResults(cpix_IdxDb * thisIdxDb, |
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cpix_JobId jobId); |
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|
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|
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/** |
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* Corresponding to sync function: cpix_IdxDb_deleteDocuments |
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* (cpixidxdb.h), see overview and description for params 'thisIdxDb' |
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* and 'docUid' there. Error status is signaled on thisIdxDb right |
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* away if the very creation of the asynchronous job has |
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* failed. In that case, you can't collect the results of the |
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* operation. |
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* |
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* For a general description of parameters 'cookie' and |
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* 'callback', see the OVERVIEW comment above. |
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* |
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* @return the job id of the created job, if successful |
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*/ |
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cpix_JobId cpix_IdxDb_asyncDeleteDocuments(cpix_IdxDb * thisIdxDb, |
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const wchar_t * docUid, |
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void * cookie, |
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cpix_AsyncCallback * callback); |
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|
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|
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/** |
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* Collects the results on the completed async delete documents |
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* operation on thisIdxDb. Error status of the job execution is |
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* signalled on thisIdxDb. |
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*/ |
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int32_t cpix_IdxDb_asyncDeleteDocumentsResults(cpix_IdxDb * thisIdxDb, |
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cpix_JobId jobId); |
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|
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|
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|
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/** |
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* Corresponding sync function: cpix_IdxDb_update (cpixidxdb.h), see |
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* overview and description for params 'thisIdxDb', 'document' and |
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* 'analyzer' there. Error status is signaled on thisIdxDb right |
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* away if the very creation of the asynchronous job has |
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* failed. In that case, you can't collect the results of the |
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* operation. |
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* |
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* For a general description of parameters 'cookie' and |
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* 'callback', see the OVERVIEW comment above. |
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* |
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* @return the job id of the created job, if successful |
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*/ |
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cpix_JobId cpix_IdxDb_asyncUpdate(cpix_IdxDb * thisIdxDb, |
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cpix_Document * document, |
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cpix_Analyzer * analyzer, |
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void * cookie, |
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cpix_AsyncCallback * callback); |
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|
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|
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/** |
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* Collects the results of the completed async update operation on |
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* thisIdxDb. Error status of the job execution is signalled on |
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* thisIdxDb. |
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*/ |
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void cpix_IdxDb_asyncUpdateResults(cpix_IdxDb * thisIdxDb, |
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cpix_JobId jobId); |
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|
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|
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|
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/** |
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* Corresponding sync function: cpix_IdxDb_flush (cpixidxdb.h), |
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* see overview and description for params 'thisIdxDb'. Error |
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* status is signaled on thisIdxDb right away if the very creation |
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* of the asynchronous job has failed. In that case, you can't |
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* collect the results of the operation. |
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* |
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* For a general description of parameters 'cookie' and |
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* 'callback', see the OVERVIEW comment above. |
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* |
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* @return the job id of the created job, if successful |
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*/ |
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cpix_JobId cpix_IdxDb_asyncFlush(cpix_IdxDb * thisIdxDb, |
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void * cookie, |
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cpix_AsyncCallback * callback); |
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|
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|
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/** |
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* Collects the results of the completed flush operation on the |
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* given thisIdxDb. Error status of the job execution is signalled |
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* on thisIdxDb. |
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*/ |
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void cpix_IdxDb_asyncFlushResults(cpix_IdxDb * thisIdxDb, |
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cpix_JobId jobId); |
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|
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|
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|
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/** |
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* Corresponding sync function: cpix_doHousekeeping (cpixinit.h), |
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* see overview. This function is a "static"/"library" function, |
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* that is, it does not have a "this" parameter, only cpix_Result |
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* that can tell if the creation of async job has failed. On |
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* failure of creating the job, you can't collect the results of |
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* the operation. |
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* |
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* For a general description of parameters 'cookie' and |
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* 'callback', see the OVERVIEW comment above. |
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* |
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* @return the job id of the created job, if successful |
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*/ |
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cpix_JobId cpix_asyncDoHousekeeping(cpix_Result * result, |
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void * cookie, |
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cpix_AsyncCallback * callback); |
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|
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|
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/** |
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* Collects the results of the completed doHousekeeping |
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* operation. Error status of job execution is signalled on |
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* result. |
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*/ |
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void cpix_asyncDoHousekeepingResults(cpix_Result * result, |
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cpix_JobId jobId); |
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|
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|
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/** |
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* TODO: review this comment "Error status is NOT signaled on thisIdxDb" |
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* Corresponding sync function: cpix_IdxDb_search (cpixidxdb.h), |
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* see overview and description for params 'thisIdxDb' and |
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* 'query'. Error status is NOT signaled on thisIdxDb. Error |
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* status is signaled on thisIdxDb right away if the very creation |
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* of the asynchronous job has failed. In that case, you can't |
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* cancel or collect the results of the operation. |
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* |
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* For a general description of parameters 'cookie' and |
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* 'callback', see the OVERVIEW comment above. |
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* |
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* @return the job id of the created job, if successful |
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*/ |
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cpix_JobId cpix_IdxDb_asyncSearch(cpix_IdxDb * thisIdxDb, |
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cpix_Query * query, |
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void * cookie, |
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cpix_AsyncCallback * callback); |
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|
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|
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/** |
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* Collects the results on the completed async search operation on |
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* thisIdxDb. Error status of the job execution is signalled on |
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* thisIdxDb. |
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*/ |
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cpix_Hits * cpix_IdxDb_asyncSearchResults(cpix_IdxDb * thisIdxDb, |
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cpix_JobId jobId); |
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389 |
|
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|
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/** |
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* Cancels the outstanding async operation on the given index |
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* database. Once this method has returned, no callbacks will be |
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* called for that object (there may be callbacks before this |
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* returns). |
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* |
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* @returns the way the cancel was handled |
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*/ |
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cpix_CancelAction cpix_IdxDb_cancelSearch(cpix_IdxDb * thisIdxDb, |
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cpix_JobId jobId); |
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|
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|
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/** |
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* Corresponding sync function: cpix_IdxSearcher_search |
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* (cpixsearch.h), see overview and description for params |
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* 'thisIdxSearcher' and 'query'. Error status is signaled on |
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* thisIdxDb right away if the very creation of the asynchronous |
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* job has failed. In that case, you can't cancel or collect the |
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* results of the operation. |
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* |
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* For a general description of parameters 'cookie' and |
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* 'callback', see the OVERVIEW comment above. |
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* |
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* @return the job id of the created job, if successful |
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*/ |
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cpix_JobId cpix_IdxSearcher_asyncSearch(cpix_IdxSearcher * thisIdxSearcher, |
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cpix_Query * query, |
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void * cookie, |
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cpix_AsyncCallback * callback); |
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|
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|
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|
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/** |
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* Collects the results on the completed async search operation on |
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* thisIdxSearcher. Error status of the job execution is signalled |
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* on thisIdxDb. |
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* |
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* Ownership of the hits is transferred to the client. |
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*/ |
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430 |
cpix_Hits * |
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cpix_IdxSearcher_asyncSearchResults(cpix_IdxSearcher * thisIdxsearcher, |
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432 |
cpix_JobId jobId); |
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433 |
|
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434 |
/** |
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435 |
* Cancels the outstanding async search operation on the given |
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436 |
* searcher. Once this method has returned, no callbacks will be |
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437 |
* called for that object (there may be callbacks before this |
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* returns). |
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439 |
* |
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* @returns the way the cancel was handled |
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*/ |
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442 |
cpix_CancelAction |
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443 |
cpix_IdxSearcher_cancelSearch(cpix_IdxSearcher * thisIdxSearcher, |
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|
444 |
cpix_JobId jobId); |
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|
445 |
|
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|
446 |
|
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447 |
/** |
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448 |
* Corresponding to the function: cpix_Hits_doc |
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* (cpixsearch.h). See overview and description for params |
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* 'thisHits', 'index' and 'target'. Error status is signaled on |
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451 |
* thisHits right away if the very creation of the asynchronous |
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452 |
* job has failed. In that case, you can't cancel or collect the |
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* results of the operation. |
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454 |
* |
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* For generation description of parameters 'cookie' and |
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* 'callback' see the OVERVIEW comment above. |
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457 |
* |
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458 |
* Document retrieval may trigger re-committing the original |
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459 |
* search, if the underlying indexes were modified, hence the need |
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* for async version of this operation. |
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461 |
* |
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462 |
* NOTE: The semantics of param 'target' are almost exactly the |
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463 |
* same as in the sync version: the wrapper is owned by the |
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464 |
* client, the wrapped is owned by engine, hence this type of |
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465 |
* signature. |
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466 |
* |
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467 |
* NOTE: However, there is one |
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468 |
* C R U C I A L |
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469 |
* difference between how |
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470 |
* target document can be allocated. In the sync version it |
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471 |
* can/should be a local variable, on the stack. But in the async |
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472 |
* version, you MUST absolutely make certain that cpix_Document |
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* instance target points to is not on the stack, but part of some |
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474 |
* C++ class instance / C struct instance layout. This is because |
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475 |
* while cpix_Hits_asycnDoc is cancellable, it only means that the |
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476 |
* client has the right to not collect the results, but the |
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477 |
* operation may (will) be completed, and therefore the place |
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* target points to will be initialized as a cpix_Document. But, |
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479 |
* by the time that happens, the client will have moved on, after |
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480 |
* cancelling the operation, to do other stuff, which means that |
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481 |
* callstack of the client will be MESSED UP. Hence, keep the |
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482 |
* target document off the stack, somewhere in the layout of a |
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* C/C++ object instance. |
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484 |
* |
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* @return the job id of the created job, if successful |
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486 |
*/ |
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|
487 |
cpix_JobId cpix_Hits_asyncDoc(cpix_Hits * thisHits, |
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|
488 |
int32_t index, |
14 | 489 |
cpix_Document ** target, |
0
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|
490 |
void * cookie, |
14 | 491 |
cpix_AsyncCallback * callback, |
492 |
int32_t count); |
|
0
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|
493 |
|
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|
494 |
|
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|
495 |
/** |
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|
496 |
* Collects the results of the completed async doc-retrieval |
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497 |
* operation on thisHits. Error status of the job execution is |
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|
498 |
* signalled on thisHits. |
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|
499 |
*/ |
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500 |
void cpix_Hits_asyncDocResults(cpix_Hits * thisHits, |
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|
501 |
cpix_JobId jobId); |
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|
502 |
|
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|
503 |
|
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|
504 |
/** |
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|
505 |
* Cancels the outstanding async search operation on the given |
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|
506 |
* hits list. Once this method as has returned, no callbacks will |
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|
507 |
* be called for that object (there may be callbacks before this |
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|
508 |
* returns). |
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|
509 |
* |
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|
510 |
* |
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511 |
* @returns the way the cancel was handled |
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512 |
*/ |
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|
513 |
cpix_CancelAction cpix_Hits_cancelDoc(cpix_Hits * thisHits, |
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|
514 |
cpix_JobId jobId); |
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|
515 |
|
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|
516 |
|
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|
517 |
|
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|
518 |
|
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|
519 |
|
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|
520 |
|
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|
521 |
|
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|
522 |
|
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523 |
|
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|
524 |
|
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|
525 |
#ifdef __cplusplus |
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526 |
} /* extern "C" */ |
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527 |
#endif /* __cplusplus */ |
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528 |
|
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|
529 |
#endif CPIX_CPIX_ASYNC_H |