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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: virtualmachine.hxx,v $
* $Revision: 1.7 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#if !defined INCLUDED_JVMACCESS_VIRTUALMACHINE_HXX
#define INCLUDED_JVMACCESS_VIRTUALMACHINE_HXX
#include "rtl/ref.hxx"
#include "salhelper/simplereferenceobject.hxx"
#ifdef SOLAR_JAVA
#include "jni.h"
#else
struct JNIEnv;
struct JavaVM;
typedef int jint;
typedef void * jobject;
#endif
namespace jvmaccess {
/** An encapsulating wrapper around a Java virtual machine.
*/
class VirtualMachine: public salhelper::SimpleReferenceObject
{
public:
/** A helper to attach a thread to a Java virtual machine.
@descr
Upon construction of a guard the current thread is attached to the
virtual machine, and upon destruction of the guard the thread is
detached again. For any one thread, multiple instances of this class
may be used in a stack-like fashion (care is taken to only really
detach the thread from the virtual machine upon destruction of the guard
at the bottom of the stack).
*/
class AttachGuard
{
public:
/** An exception indicating failure to create an AttachGuard.
*/
class CreationException
{
public:
CreationException();
CreationException(CreationException const &);
virtual ~CreationException();
CreationException & operator =(CreationException const &);
};
/** Attach the current thread to a virtual machine.
@param rMachine
The virtual machine to attach to. Must not be a null reference.
@exception CreationException
Thrown in case attaching fails (due to a JNI problem).
*/
explicit AttachGuard(rtl::Reference< VirtualMachine > const & rMachine);
/** Detach the current thread from the virtual machine again.
*/
~AttachGuard();
/** Get a JNI environment pointer for the current thread.
@return
A valid JNI environment pointer. Will never be null.
*/
inline JNIEnv * getEnvironment() const { return m_pEnvironment; }
private:
AttachGuard(AttachGuard &); // not implemented
void operator =(AttachGuard); // not implemented
rtl::Reference< VirtualMachine > m_xMachine;
JNIEnv * m_pEnvironment;
bool m_bDetach;
};
/** Create a wrapper around a Java virtual machine.
@param pVm
A JNI pointer to virtual machine. Must not be null.
@param nVersion
The JNI version of the virtual machine pointed to by pVm. Must be at
least JNI_VERSION_1_2. This parameter should be of type jint, not int,
but at least on some platforms the definition of jint changed from
JDK 1.3 (long) to JDK 1.4 (int), so that the mangled C++ name of the
constructor would depend on the JDK version used at compile time.
@param bDestroy
Whether to destroy the virtual machine when destructing the wrapper
(i.e., whether the wrapper owns the virtual machine pointed to by pVm).
@param pMainThreadEnv
A valid JNI environment pointer for the current thread; must not be
null. The current thread must be "initially attached" to the virtual
machine while this constructor is being called (i.e., it must be the
thread that has called JNI_CreateJavaVM in case the virtual machine has
been started via the JNI Invocation API, and it must not already have
called DetachCurrentThread; or it must be executing native code called
from a "primordial" virtual machine). This environment pointer is used
to obtain a reference to the thread's current context class loader
(java.lang.Thread.getCurrentClassLoader). If later a native thread is
attached to the virtual machine, that thread's context class loader
would be null, so the AttachGuard first of all sets it to the saved
value. In a nutshell, this means that all native threads attached to
the virtual machine use the context class loader of the "initial Java
thread."
*/
VirtualMachine(JavaVM * pVm, int nVersion, bool bDestroy,
JNIEnv * pMainThreadEnv);
private:
VirtualMachine(VirtualMachine &); // not implemented
void operator =(VirtualMachine); // not implemented
virtual ~VirtualMachine();
void acquireInitialContextClassLoader(JNIEnv * pEnv);
void releaseInitialContextClassLoader() const;
JNIEnv * attachThread(bool * pAttached) const;
void detachThread() const;
JavaVM * m_pVm;
jint m_nVersion;
bool m_bDestroy;
jobject m_aInitialContextClassLoader;
friend class AttachGuard; // to access attachThread, detachThread
};
}
#endif // INCLUDED_JVMACCESS_VIRTUALMACHINE_HXX
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