author | Shabe Razvi <shaber@symbian.org> |
Thu, 02 Sep 2010 15:46:18 +0100 | |
branch | RCL_3 |
changeset 68 | 67b21c8abcea |
parent 19 | 04becd199f91 |
permissions | -rw-r--r-- |
19
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/* |
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* Copyright (c) 2008 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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package com.nokia.mj.impl.comms; |
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|
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import com.nokia.mj.impl.rt.support.Jvm; |
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import com.nokia.mj.impl.utils.Logger; |
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import com.nokia.mj.impl.comms.exception.CommsException; |
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|
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/** |
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* This is a CommsEndpoint class, it provides implementation for |
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* registering listeners and for synchronous message sending. |
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* <p> |
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* Comms endpoint provides interprocess communication functionality. Comms communication |
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* is point-to-point meaning that client endpoint can be connected to a single server at a time. |
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* Communication is message based, where users wrap their payload to CommsMessage. |
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* Comms endpoints support synchronous and asynchronous message sending. |
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* <p> |
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* Messages can be sent asynchronously or synchronously. Synchronous message sending blocks until |
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* a reply is received or when specified timeout occurs. |
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* <p> |
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* CommsListener provides a way to receive messages asynchronously. Listeners are registered |
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* to endpoint. When message belonging to listener is received, will Comms endpoint make a |
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* callback for listener. Application can register as many listeners as need. |
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* <p> |
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* Example to use CommsEndpoint class: |
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* <pre> |
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* <code> |
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* CommsEndpoint comms = new CommsEndpoint(); |
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* comms.connect(CommsEndpoint.JAVA_CAPTAIN); |
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* comms.registerListener(MODULE_ID, listener); |
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* |
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* CommsMessage message = new CommsMessage(); |
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* |
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* message.setMessageId(MESSAGE_ID); |
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* message.setModuleId(MODULE_ID); |
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* |
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* message.write("hello world from java"); |
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* |
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* comms.send(message); |
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* comms.destroy(); |
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* </code> |
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* </pre> |
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*/ |
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|
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public final class CommsEndpoint extends CommsEndpointBase |
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{ |
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/** |
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* 'well-known' server endpoints |
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*/ |
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public static final int JAVA_CAPTAIN = 10000; |
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public static final int TCK_RUNNER = 10300; |
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public static final int JAVA_PREINSTALLER = 10400; |
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public static final int JAVA_APPCONVERTER = 10500; |
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public static final int JAVA_DEBUGAPI = 10700; |
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|
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/** |
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* This constant can be used when synchronous sendReceive should not return because of timeout. |
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* SendReceive method will return when reply is received or when connection is closed. |
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* @see #sendReceive |
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*/ |
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public static final int WAIT_FOR_EVER = -1; |
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private boolean iReleaseHandle; |
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|
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static |
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{ |
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Jvm.loadSystemLibrary("javacomms"); |
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} |
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|
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public CommsEndpoint() |
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{ |
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iHandle = _create(); |
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iReleaseHandle = true; |
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} |
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|
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private CommsEndpoint(int aHandle) |
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{ |
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iHandle = aHandle; |
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iReleaseHandle = false; |
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} |
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public static CommsEndpoint find(String aName) |
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{ |
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int handle = _find(aName); |
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CommsEndpoint client = null; |
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if (handle != 0) |
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102 |
{ |
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103 |
client = new CommsEndpoint(handle); |
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104 |
} |
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105 |
return client; |
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106 |
} |
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107 |
|
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108 |
public void connect(int aName) throws CommsException |
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109 |
{ |
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110 |
checkHandle(); |
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111 |
int rc = _connect(iHandle, aName); |
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112 |
if (rc!=0) |
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113 |
{ |
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114 |
throw new CommsException("connect failed, address=" + aName); |
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115 |
} |
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116 |
} |
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117 |
|
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118 |
public void disconnect() throws CommsException |
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119 |
{ |
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120 |
checkHandle(); |
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121 |
int rc = _disconnect(iHandle); |
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122 |
if (rc!=0) |
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123 |
{ |
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124 |
throw new CommsException("disconnect failed"); |
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125 |
} |
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126 |
} |
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127 |
|
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128 |
/** |
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129 |
* Releases native resources. |
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130 |
* This method must be called when endpoint is no longer needed. |
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131 |
* After calling this method it's not possible to call other methods. |
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132 |
*/ |
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133 |
public void destroy() |
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134 |
{ |
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135 |
if (iHandle != 0) |
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136 |
{ |
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137 |
if (iReleaseHandle) |
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138 |
{ |
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139 |
_release(iHandle); |
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140 |
} |
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141 |
else |
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142 |
{ |
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143 |
_detach(iHandle); |
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144 |
} |
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145 |
} |
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146 |
iHandle = 0; |
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147 |
} |
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148 |
|
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149 |
|
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150 |
// native methods |
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151 |
private native int _create(); |
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152 |
private native int _connect(int handle, int name); |
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153 |
private native int _disconnect(int handle); |
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154 |
private native static int _find(String name); |
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155 |
} |