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
CreationException()29 VirtualMachine::AttachGuard::CreationException::CreationException()
30 {}
31
CreationException(CreationException const &)32 VirtualMachine::AttachGuard::CreationException::CreationException(
33 CreationException const &)
34 {}
35
~CreationException()36 VirtualMachine::AttachGuard::CreationException::~CreationException()
37 {}
38
39 VirtualMachine::AttachGuard::CreationException &
operator =(CreationException const &)40 VirtualMachine::AttachGuard::CreationException::operator =(
41 CreationException const &)
42 {
43 return *this;
44 }
45
AttachGuard(rtl::Reference<VirtualMachine> const & rMachine)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
~AttachGuard()56 VirtualMachine::AttachGuard::~AttachGuard()
57 {
58 if (m_bDetach)
59 m_xMachine->detachThread();
60 }
61
VirtualMachine(JavaVM * pVm,int nVersion,bool bDestroy,JNIEnv const * pMainThreadEnv)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
~VirtualMachine()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
attachThread(bool * pAttached) const87 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
detachThread() const115 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: */
122