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 <sal/config.h>
  21
  22 #include <cassert>
  23
  24 #include <jvmaccess/virtualmachine.hxx>
  25 #include <sal/log.hxx>
  26
  27 using jvmaccess::VirtualMachine;
  28
  29 VirtualMachine::AttachGuard::CreationException::CreationException()
  30 {}
  31
  32 VirtualMachine::AttachGuard::CreationException::CreationException(
  33     CreationException const &)
  34 {}
  35
  36 VirtualMachine::AttachGuard::CreationException::~CreationException()
  37 {}
  38
  39 VirtualMachine::AttachGuard::CreationException &
  40 VirtualMachine::AttachGuard::CreationException::operator =(
  41     CreationException const &)
  42 {
  43     return *this;
  44 }
  45
  46 VirtualMachine::AttachGuard::AttachGuard(
  47     rtl::Reference< VirtualMachine > const & rMachine):
  48     m_xMachine(rMachine)
  49 {
  50     assert(m_xMachine.is());
  51     m_pEnvironment = m_xMachine->attachThread(&m_bDetach);
  52     if (m_pEnvironment == nullptr)
  53         throw CreationException();
  54 }
  55
  56 VirtualMachine::AttachGuard::~AttachGuard()
  57 {
  58     if (m_bDetach)
  59         m_xMachine->detachThread();
  60 }
  61
  62 VirtualMachine::VirtualMachine(JavaVM * pVm, int nVersion, bool bDestroy,
  63                                JNIEnv const * pMainThreadEnv):
  64     m_pVm(pVm), m_nVersion(nVersion), m_bDestroy(bDestroy)
  65 {
  66     (void) pMainThreadEnv; // avoid warnings
  67     assert(pVm != nullptr);
  68     assert(nVersion >= JNI_VERSION_1_2);
  69     assert(pMainThreadEnv);
  70 }
  71
  72 VirtualMachine::~VirtualMachine()
  73 {
  74     if (m_bDestroy)
  75     {
  76         // Do not destroy the VM.  Under Java 1.3, the AWT event loop thread is
  77         // not a daemon thread and is never terminated, so that calling
  78         // DestroyJavaVM (waiting for all non-daemon threads to terminate) hangs
  79         // forever.
  80 /*
  81         jint n = m_pVm->DestroyJavaVM();
  82         SAL_WARN_IF(n != JNI_OK, "jvmaccess", "JNI: DestroyJavaVM failed");
  83 */
  84     }
  85 }
  86
  87 JNIEnv * VirtualMachine::attachThread(bool * pAttached) const
  88 {
  89     assert(pAttached != nullptr && "bad parameter");
  90     JNIEnv * pEnv;
  91     jint n = m_pVm->GetEnv(reinterpret_cast< void ** >(&pEnv), m_nVersion);
  92     SAL_WARN_IF(
  93         n != JNI_OK && n != JNI_EDETACHED, "jvmaccess", "JNI: GetEnv failed");
  94     if (pEnv == nullptr)
  95     {
  96         if (m_pVm->AttachCurrentThread
  97             (
  98 #ifndef ANDROID
  99              reinterpret_cast< void ** >(&pEnv),
 100 #else
 101              // The Android <jni.h> has AttachCurrentThread() taking a
 102              // JNIEnv** and not void **
 103              &pEnv,
 104 #endif
 105              nullptr)
 106             != JNI_OK)
 107             return nullptr;
 108         *pAttached = true;
 109     }
 110     else
 111         *pAttached = false;
 112     return pEnv;
 113 }
 114
 115 void VirtualMachine::detachThread() const
 116 {
 117     jint n = m_pVm->DetachCurrentThread();
 118     SAL_WARN_IF(n != JNI_OK, "jvmaccess", "JNI: DetachCurrentThread failed");
 119 }
 120
 121 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */