jvmaccess/source/virtualmachine.cxx

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  30
  31 #include "jvmaccess/virtualmachine.hxx"
  32
  33 #include "osl/diagnose.h"
  34
  35 using jvmaccess::VirtualMachine;
  36
  37 VirtualMachine::AttachGuard::CreationException::CreationException()
  38 {}
  39
  40 VirtualMachine::AttachGuard::CreationException::CreationException(
  41     CreationException const &)
  42 {}
  43
  44 VirtualMachine::AttachGuard::CreationException::~CreationException()
  45 {}
  46
  47 VirtualMachine::AttachGuard::CreationException &
  48 VirtualMachine::AttachGuard::CreationException::operator =(
  49     CreationException const &)
  50 {
  51     return *this;
  52 }
  53
  54 VirtualMachine::AttachGuard::AttachGuard(
  55     rtl::Reference< VirtualMachine > const & rMachine):
  56     m_xMachine(rMachine)
  57 {
  58     OSL_ENSURE(m_xMachine.is(), "bad parameter");
  59     m_pEnvironment = m_xMachine->attachThread(&m_bDetach);
  60     if (m_pEnvironment == 0)
  61         throw CreationException();
  62 }
  63
  64 VirtualMachine::AttachGuard::~AttachGuard()
  65 {
  66     if (m_bDetach)
  67         m_xMachine->detachThread();
  68 }
  69
  70 VirtualMachine::VirtualMachine(JavaVM * pVm, int nVersion, bool bDestroy,
  71                                JNIEnv * pMainThreadEnv):
  72     m_pVm(pVm), m_nVersion(nVersion), m_bDestroy(bDestroy)
  73 {
  74     (void) pMainThreadEnv; // avoid warnings
  75 #ifdef SOLAR_JAVA
  76     OSL_ENSURE(pVm != 0 && nVersion >= JNI_VERSION_1_2 && pMainThreadEnv != 0,
  77                "bad parameter");
  78 #endif
  79 }
  80
  81 VirtualMachine::~VirtualMachine()
  82 {
  83     if (m_bDestroy)
  84     {
  85         // Do not destroy the VM.  Under Java 1.3, the AWT event loop thread is
  86         // not a daemon thread and is never terminated, so that calling
  87         // DestroyJavaVM (waiting for all non-daemon threads to terminate) hangs
  88         // forever.
  89 /*
  90         jint n = m_pVm->DestroyJavaVM();
  91         OSL_ENSURE(n == JNI_OK, "JNI: DestroyJavaVM failed");
  92 */
  93     }
  94 }
  95
  96 JNIEnv * VirtualMachine::attachThread(bool * pAttached) const
  97 {
  98 #ifndef SOLAR_JAVA
  99     return 0;
 100 #else
 101     OSL_ENSURE(pAttached != 0, "bad parameter");
 102     JNIEnv * pEnv;
 103     jint n = m_pVm->GetEnv(reinterpret_cast< void ** >(&pEnv), m_nVersion);
 104     if (n != JNI_OK && n != JNI_EDETACHED) {
 105         OSL_ENSURE(false, "JNI: GetEnv failed");
 106     }
 107     if (pEnv == 0)
 108     {
 109         if (m_pVm->AttachCurrentThread(reinterpret_cast< void ** >(&pEnv), 0)
 110             != JNI_OK)
 111             return 0;
 112         *pAttached = true;
 113     }
 114     else
 115         *pAttached = false;
 116     return pEnv;
 117 #endif
 118 }
 119
 120 void VirtualMachine::detachThread() const
 121 {
 122 #ifdef SOLAR_JAVA
 123     if (m_pVm->DetachCurrentThread() != JNI_OK) {
 124         OSL_ENSURE(false, "JNI: DetachCurrentThread failed");
 125     }
 126 #endif
 127 }