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lightning-sunbird  0.9+nobinonly
MRJMonitor.cpp
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00036 
00037 /*
00038        MRJMonitor.cpp
00039        
00040        Provides a C++ interface to Java monitors.
00041        
00042        by Patrick C. Beard.
00043  */
00044 
00045 #include "MRJMonitor.h"
00046 #include "MRJSession.h"
00047 
00048 MRJMonitor::MRJMonitor(MRJSession* session, jobject monitor)
00049        :      mSession(session), mMonitor(NULL), mWaitMethod(NULL), mNotifyMethod(NULL), mNotifyAllMethod(NULL)
00050 {
00051        JNIEnv* env = mSession->getCurrentEnv();
00052        jclass javaLangObject = env->FindClass("java/lang/Object");
00053        if (javaLangObject != NULL) {
00054               // look up method IDs.
00055               mWaitMethod = env->GetMethodID(javaLangObject, "wait", "()V");
00056               mTimedWaitMethod = env->GetMethodID(javaLangObject, "wait", "(J)V");
00057               mNotifyMethod = env->GetMethodID(javaLangObject, "notify", "()V");
00058               mNotifyAllMethod = env->GetMethodID(javaLangObject, "notifyAll", "()V");
00059               
00060               Boolean allocateMonitor = (monitor == NULL);
00061               if (allocateMonitor)
00062                      monitor = env->AllocObject(javaLangObject);
00063               
00064               if (monitor != NULL)
00065                      mMonitor = env->NewGlobalRef(monitor);
00066 
00067               if (allocateMonitor)
00068                      env->DeleteLocalRef(monitor);
00069 
00070               env->DeleteLocalRef(javaLangObject);
00071        }
00072 }
00073 
00074 MRJMonitor::~MRJMonitor()
00075 {
00076        if (mMonitor != NULL) {
00077               JNIEnv* env = mSession->getCurrentEnv();
00078               env->DeleteGlobalRef(mMonitor);
00079               mMonitor = NULL;
00080        }
00081 }
00082 
00083 void MRJMonitor::enter()
00084 {
00085        JNIEnv* env = mSession->getCurrentEnv();
00086        env->MonitorEnter(mMonitor);
00087 }
00088 
00089 void MRJMonitor::exit()
00090 {
00091        JNIEnv* env = mSession->getCurrentEnv();
00092        env->MonitorExit(mMonitor);
00093 }
00094 
00095 void MRJMonitor::wait()
00096 {
00097        if (mMonitor != NULL && mWaitMethod != NULL) {
00098               JNIEnv* env = mSession->getCurrentEnv();
00099               env->MonitorEnter(mMonitor);
00100               env->CallVoidMethod(mMonitor, mWaitMethod);
00101               env->MonitorExit(mMonitor);
00102        }
00103 }
00104 
00105 void MRJMonitor::wait(long long millis)
00106 {
00107        if (mMonitor != NULL && mWaitMethod != NULL) {
00108               JNIEnv* env = mSession->getCurrentEnv();
00109               env->MonitorEnter(mMonitor);
00110               env->CallVoidMethod(mMonitor, mTimedWaitMethod, jlong(millis));
00111               env->MonitorExit(mMonitor);
00112        }
00113 }
00114 
00115 void MRJMonitor::notify()
00116 {
00117        if (mMonitor != NULL && mNotifyMethod != NULL) {
00118               JNIEnv* env = mSession->getCurrentEnv();
00119               env->MonitorEnter(mMonitor);
00120               env->CallVoidMethod(mMonitor, mNotifyMethod);
00121               env->MonitorExit(mMonitor);
00122        }
00123 }
00124 
00125 void MRJMonitor::notifyAll()
00126 {
00127        if (mMonitor != NULL && mNotifyAllMethod != NULL) {
00128               JNIEnv* env = mSession->getCurrentEnv();
00129               env->MonitorEnter(mMonitor);
00130               env->CallVoidMethod(mMonitor, mNotifyAllMethod);
00131               env->MonitorExit(mMonitor);
00132        }
00133 }
00134 
00135 jobject MRJMonitor::getObject()
00136 {
00137        return mMonitor;
00138 }