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lightning-sunbird  0.9+nobinonly
MRJMonitor.cpp
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00001 /* ***** BEGIN LICENSE BLOCK *****
00002  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00003  *
00004  * The contents of this file are subject to the Mozilla Public License Version
00005  * 1.1 (the "License"); you may not use this file except in compliance with
00006  * the License. You may obtain a copy of the License at
00007  * http://www.mozilla.org/MPL/
00008  *
00009  * Software distributed under the License is distributed on an "AS IS" basis,
00010  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00011  * for the specific language governing rights and limitations under the
00012  * License.
00013  *
00014  * The Original Code is the MRJ Carbon OJI Plugin.
00015  *
00016  * The Initial Developer of the Original Code is
00017  * Netscape Communications Corp.
00018  * Portions created by the Initial Developer are Copyright (C) 2001
00019  * the Initial Developer. All Rights Reserved.
00020  *
00021  * Contributor(s):
00022  *   Patrick C. Beard <beard@netscape.com>
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either of the GNU General Public License Version 2 or later (the "GPL"),
00026  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
00029  * under the terms of either the GPL or the LGPL, and not to allow others to
00030  * use your version of this file under the terms of the MPL, indicate your
00031  * decision by deleting the provisions above and replace them with the notice
00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 /*
00039        MRJMonitor.cpp
00040        
00041        Provides a C++ interface to Java monitors.
00042        
00043        by Patrick C. Beard.
00044  */
00045 
00046 #include "MRJMonitor.h"
00047 #include "MRJSession.h"
00048 
00049 MRJMonitor::MRJMonitor(MRJSession* session, jobject monitor)
00050        :      mSession(session), mMonitor(NULL), mWaitMethod(NULL), mNotifyMethod(NULL), mNotifyAllMethod(NULL)
00051 {
00052        JNIEnv* env = mSession->getCurrentEnv();
00053        jclass javaLangObject = env->FindClass("java/lang/Object");
00054        if (javaLangObject != NULL) {
00055               // look up method IDs.
00056               mWaitMethod = env->GetMethodID(javaLangObject, "wait", "()V");
00057               mTimedWaitMethod = env->GetMethodID(javaLangObject, "wait", "(J)V");
00058               mNotifyMethod = env->GetMethodID(javaLangObject, "notify", "()V");
00059               mNotifyAllMethod = env->GetMethodID(javaLangObject, "notifyAll", "()V");
00060               
00061               Boolean allocateMonitor = (monitor == NULL);
00062               if (allocateMonitor)
00063                      monitor = env->AllocObject(javaLangObject);
00064               
00065               if (monitor != NULL)
00066                      mMonitor = env->NewGlobalRef(monitor);
00067 
00068               if (allocateMonitor)
00069                      env->DeleteLocalRef(monitor);
00070 
00071               env->DeleteLocalRef(javaLangObject);
00072        }
00073 }
00074 
00075 MRJMonitor::~MRJMonitor()
00076 {
00077        if (mMonitor != NULL) {
00078               JNIEnv* env = mSession->getCurrentEnv();
00079               env->DeleteGlobalRef(mMonitor);
00080               mMonitor = NULL;
00081        }
00082 }
00083 
00084 void MRJMonitor::enter()
00085 {
00086        JNIEnv* env = mSession->getCurrentEnv();
00087        env->MonitorEnter(mMonitor);
00088 }
00089 
00090 void MRJMonitor::exit()
00091 {
00092        JNIEnv* env = mSession->getCurrentEnv();
00093        env->MonitorExit(mMonitor);
00094 }
00095 
00096 void MRJMonitor::wait()
00097 {
00098        if (mMonitor != NULL && mWaitMethod != NULL) {
00099               JNIEnv* env = mSession->getCurrentEnv();
00100               env->MonitorEnter(mMonitor);
00101               env->CallVoidMethod(mMonitor, mWaitMethod);
00102               env->MonitorExit(mMonitor);
00103        }
00104 }
00105 
00106 void MRJMonitor::wait(long long millis)
00107 {
00108        if (mMonitor != NULL && mWaitMethod != NULL) {
00109               JNIEnv* env = mSession->getCurrentEnv();
00110               env->MonitorEnter(mMonitor);
00111               env->CallVoidMethod(mMonitor, mTimedWaitMethod, jlong(millis));
00112               env->MonitorExit(mMonitor);
00113        }
00114 }
00115 
00116 void MRJMonitor::notify()
00117 {
00118        if (mMonitor != NULL && mNotifyMethod != NULL) {
00119               JNIEnv* env = mSession->getCurrentEnv();
00120               env->MonitorEnter(mMonitor);
00121               env->CallVoidMethod(mMonitor, mNotifyMethod);
00122               env->MonitorExit(mMonitor);
00123        }
00124 }
00125 
00126 void MRJMonitor::notifyAll()
00127 {
00128        if (mMonitor != NULL && mNotifyAllMethod != NULL) {
00129               JNIEnv* env = mSession->getCurrentEnv();
00130               env->MonitorEnter(mMonitor);
00131               env->CallVoidMethod(mMonitor, mNotifyAllMethod);
00132               env->MonitorExit(mMonitor);
00133        }
00134 }
00135 
00136 jobject MRJMonitor::getObject()
00137 {
00138        return mMonitor;
00139 }