jvmaccess/source/virtualmachine.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include "jvmaccess/virtualmachine.hxx"
  21
  22 #include "osl/diagnose.h"
  23
  24 using jvmaccess::VirtualMachine;
  25
  26 VirtualMachine::AttachGuard::CreationException::CreationException()
  27 {}
  28
  29 VirtualMachine::AttachGuard::CreationException::CreationException(
  30     CreationException const &)
  31 {}
  32
  33 VirtualMachine::AttachGuard::CreationException::~CreationException()
  34 {}
  35
  36 VirtualMachine::AttachGuard::CreationException &
  37 VirtualMachine::AttachGuard::CreationException::operator =(
  38     CreationException const &)
  39 {
  40     return *this;
  41 }
  42
  43 VirtualMachine::AttachGuard::AttachGuard(
  44     rtl::Reference< VirtualMachine > const & rMachine):
  45     m_xMachine(rMachine)
  46 {
  47     OSL_ENSURE(m_xMachine.is(), "bad parameter");
  48     m_pEnvironment = m_xMachine->attachThread(&m_bDetach);
  49     if (m_pEnvironment == 0)
  50         throw CreationException();
  51 }
  52
  53 VirtualMachine::AttachGuard::~AttachGuard()
  54 {
  55     if (m_bDetach)
  56         m_xMachine->detachThread();
  57 }
  58
  59 VirtualMachine::VirtualMachine(JavaVM * pVm, int nVersion, bool bDestroy,
  60                                JNIEnv * pMainThreadEnv):
  61     m_pVm(pVm), m_nVersion(nVersion), m_bDestroy(bDestroy)
  62 {
  63     (void) pMainThreadEnv; // avoid warnings
  64     OSL_ENSURE(pVm != 0 && nVersion >= JNI_VERSION_1_2 && pMainThreadEnv != 0,
  65                "bad parameter");
  66 }
  67
  68 VirtualMachine::~VirtualMachine()
  69 {
  70     if (m_bDestroy)
  71     {
  72         // Do not destroy the VM.  Under Java 1.3, the AWT event loop thread is
  73         // not a daemon thread and is never terminated, so that calling
  74         // DestroyJavaVM (waiting for all non-daemon threads to terminate) hangs
  75         // forever.
  76 /*
  77         jint n = m_pVm->DestroyJavaVM();
  78         OSL_ENSURE(n == JNI_OK, "JNI: DestroyJavaVM failed");
  79 */
  80     }
  81 }
  82
  83 JNIEnv * VirtualMachine::attachThread(bool * pAttached) const
  84 {
  85     OSL_ENSURE(pAttached != 0, "bad parameter");
  86     JNIEnv * pEnv;
  87     jint n = m_pVm->GetEnv(reinterpret_cast< void ** >(&pEnv), m_nVersion);
  88     if (n != JNI_OK && n != JNI_EDETACHED) {
  89         OSL_FAIL("JNI: GetEnv failed");
  90     }
  91     if (pEnv == 0)
  92     {
  93         if (m_pVm->AttachCurrentThread
  94             (
  95 #ifndef ANDROID
  96              reinterpret_cast< void ** >(&pEnv),
  97 #else
  98              // The Android <jni.h> has AttachCurrentThread() taking a
  99              // JNIEnv** and not void **
 100              &pEnv,
 101 #endif
 102              0)
 103             != JNI_OK)
 104             return 0;
 105         *pAttached = true;
 106     }
 107     else
 108         *pAttached = false;
 109     return pEnv;
 110 }
 111
 112 void VirtualMachine::detachThread() const
 113 {
 114     if (m_pVm->DetachCurrentThread() != JNI_OK) {
 115         OSL_FAIL("JNI: DetachCurrentThread failed");
 116     }
 117 }
 118
 119 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */