714f0868a5
Change-Id: Iadb8621d7490b55ee6dbcadffb3c7e2527958424 Reviewed-on: https://gerrit.libreoffice.org/81655 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
151 lines
5.6 KiB
C++
151 lines
5.6 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#ifndef INCLUDED_JVMACCESS_VIRTUALMACHINE_HXX
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#define INCLUDED_JVMACCESS_VIRTUALMACHINE_HXX
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#include <jvmaccess/jvmaccessdllapi.h>
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#include <rtl/ref.hxx>
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#include <salhelper/simplereferenceobject.hxx>
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#include <jni.h>
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namespace jvmaccess {
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/** An encapsulating wrapper around a Java virtual machine.
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*/
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class JVMACCESS_DLLPUBLIC VirtualMachine final : public salhelper::SimpleReferenceObject
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{
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public:
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/** A helper to attach a thread to a Java virtual machine.
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@descr
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Upon construction of a guard the current thread is attached to the
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virtual machine, and upon destruction of the guard the thread is
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detached again. For any one thread, multiple instances of this class
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may be used in a stack-like fashion (care is taken to only really
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detach the thread from the virtual machine upon destruction of the guard
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at the bottom of the stack).
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*/
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class JVMACCESS_DLLPUBLIC AttachGuard
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{
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public:
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/** An exception indicating failure to create an AttachGuard.
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*/
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class JVMACCESS_DLLPUBLIC CreationException final
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{
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public:
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CreationException();
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CreationException(CreationException const &);
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~CreationException();
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CreationException & operator =(CreationException const &);
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};
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/** Attach the current thread to a virtual machine.
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@param rMachine
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The virtual machine to attach to. Must not be a null reference.
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@exception CreationException
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Thrown in case attaching fails (due to a JNI problem).
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*/
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explicit AttachGuard(rtl::Reference< VirtualMachine > const & rMachine);
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/** Detach the current thread from the virtual machine again.
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*/
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~AttachGuard();
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/** Get a JNI environment pointer for the current thread.
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@return
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A valid JNI environment pointer. Will never be null.
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*/
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JNIEnv * getEnvironment() const { return m_pEnvironment; }
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private:
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AttachGuard(AttachGuard const &) = delete;
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AttachGuard& operator =(AttachGuard const &) = delete;
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rtl::Reference< VirtualMachine > m_xMachine;
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JNIEnv * m_pEnvironment;
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bool m_bDetach;
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};
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/** Create a wrapper around a Java virtual machine.
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@param pVm
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A JNI pointer to virtual machine. Must not be null.
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@param nVersion
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The JNI version of the virtual machine pointed to by pVm. Must be at
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least JNI_VERSION_1_2. This parameter should be of type jint, not int,
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but at least on some platforms the definition of jint changed from
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JDK 1.3 (long) to JDK 1.4 (int), so that the mangled C++ name of the
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constructor would depend on the JDK version used at compile time.
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@param bDestroy
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Whether to destroy the virtual machine when destructing the wrapper
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(i.e., whether the wrapper owns the virtual machine pointed to by pVm).
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@param pMainThreadEnv
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A valid JNI environment pointer for the current thread; must not be
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null. The current thread must be "initially attached" to the virtual
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machine while this constructor is being called (i.e., it must be the
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thread that has called JNI_CreateJavaVM in case the virtual machine has
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been started via the JNI Invocation API, and it must not already have
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called DetachCurrentThread; or it must be executing native code called
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from a "primordial" virtual machine). This environment pointer was
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formerly used to obtain a reference to the thread's current context
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class loader (java.lang.Thread.getCurrentClassLoader; if later a native
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thread was attached to the virtual machine, that thread's context class
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loader would be null, so the AttachGuard first of all set it to the
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saved value; this feature has been removed again for performance reasons
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and because the default context class loader is often not useful, so
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that code relying on a context class loader has to set one explicitly,
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anyway). This parameter is currently unused (but may be used again in
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the future).
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*/
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VirtualMachine(JavaVM * pVm, int nVersion, bool bDestroy,
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JNIEnv const * pMainThreadEnv);
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private:
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VirtualMachine(VirtualMachine const &) = delete;
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VirtualMachine& operator =(VirtualMachine const & ) = delete;
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virtual ~VirtualMachine() override;
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JNIEnv * attachThread(bool * pAttached) const;
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void detachThread() const;
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JavaVM * m_pVm;
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jint m_nVersion;
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bool m_bDestroy;
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friend class AttachGuard; // to access attachThread, detachThread
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};
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}
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#endif // INCLUDED_JVMACCESS_VIRTUALMACHINE_HXX
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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