jvmaccess/source/virtualmachine.cxx

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  28
  29 #include "jvmaccess/virtualmachine.hxx"
  30
  31 #include "osl/diagnose.h"
  32
  33 using jvmaccess::VirtualMachine;
  34
  35 VirtualMachine::AttachGuard::CreationException::CreationException()
  36 {}
  37
  38 VirtualMachine::AttachGuard::CreationException::CreationException(
  39     CreationException const &)
  40 {}
  41
  42 VirtualMachine::AttachGuard::CreationException::~CreationException()
  43 {}
  44
  45 VirtualMachine::AttachGuard::CreationException &
  46 VirtualMachine::AttachGuard::CreationException::operator =(
  47     CreationException const &)
  48 {
  49     return *this;
  50 }
  51
  52 VirtualMachine::AttachGuard::AttachGuard(
  53     rtl::Reference< VirtualMachine > const & rMachine):
  54     m_xMachine(rMachine)
  55 {
  56     OSL_ENSURE(m_xMachine.is(), "bad parameter");
  57     m_pEnvironment = m_xMachine->attachThread(&m_bDetach);
  58     if (m_pEnvironment == 0)
  59         throw CreationException();
  60 }
  61
  62 VirtualMachine::AttachGuard::~AttachGuard()
  63 {
  64     if (m_bDetach)
  65         m_xMachine->detachThread();
  66 }
  67
  68 VirtualMachine::VirtualMachine(JavaVM * pVm, int nVersion, bool bDestroy,
  69                                JNIEnv * pMainThreadEnv):
  70     m_pVm(pVm), m_nVersion(nVersion), m_bDestroy(bDestroy)
  71 {
  72     (void) pMainThreadEnv; // avoid warnings
  73 #ifdef SOLAR_JAVA
  74     OSL_ENSURE(pVm != 0 && nVersion >= JNI_VERSION_1_2 && pMainThreadEnv != 0,
  75                "bad parameter");
  76 #endif
  77 }
  78
  79 VirtualMachine::~VirtualMachine()
  80 {
  81     if (m_bDestroy)
  82     {
  83         // Do not destroy the VM.  Under Java 1.3, the AWT event loop thread is
  84         // not a daemon thread and is never terminated, so that calling
  85         // DestroyJavaVM (waiting for all non-daemon threads to terminate) hangs
  86         // forever.
  87 /*
  88         jint n = m_pVm->DestroyJavaVM();
  89         OSL_ENSURE(n == JNI_OK, "JNI: DestroyJavaVM failed");
  90 */
  91     }
  92 }
  93
  94 JNIEnv * VirtualMachine::attachThread(bool * pAttached) const
  95 {
  96 #ifndef SOLAR_JAVA
  97     (void) pAttached;
  98     return 0;
  99 #else
 100     OSL_ENSURE(pAttached != 0, "bad parameter");
 101     JNIEnv * pEnv;
 102     jint n = m_pVm->GetEnv(reinterpret_cast< void ** >(&pEnv), m_nVersion);
 103     if (n != JNI_OK && n != JNI_EDETACHED) {
 104         OSL_FAIL("JNI: GetEnv failed");
 105     }
 106     if (pEnv == 0)
 107     {
 108         if (m_pVm->AttachCurrentThread
 109             (
 110 #ifndef ANDROID
 111              reinterpret_cast< void ** >(&pEnv),
 112 #else
 113              // The Android <jni.h> has AttachCurrentThread() taking a
 114              // JNIEnv** and not void **
 115              &pEnv,
 116 #endif
 117              0)
 118             != JNI_OK)
 119             return 0;
 120         *pAttached = true;
 121     }
 122     else
 123         *pAttached = false;
 124     return pEnv;
 125 #endif
 126 }
 127
 128 void VirtualMachine::detachThread() const
 129 {
 130 #ifdef SOLAR_JAVA
 131     if (m_pVm->DetachCurrentThread() != JNI_OK) {
 132         OSL_FAIL("JNI: DetachCurrentThread failed");
 133     }
 134 #endif
 135 }
 136
 137 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */