/* * This file is part of the LibreOffice project. * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. * * This file incorporates work covered by the following license notice: * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed * with this work for additional information regarding copyright * ownership. The ASF licenses this file to you under the Apache * License, Version 2.0 (the "License"); you may not use this file * except in compliance with the License. You may obtain a copy of * the License at http://www.apache.org/licenses/LICENSE-2.0 . */ package com.sun.star.lib.uno.environments.remote; import java.io.PrintWriter; import java.io.StringWriter; import java.lang.reflect.InvocationTargetException; import com.sun.star.lib.uno.typedesc.MethodDescription; import com.sun.star.uno.Any; import com.sun.star.uno.IMethodDescription; import com.sun.star.uno.Type; import com.sun.star.uno.UnoRuntime; import com.sun.star.uno.XCurrentContext; /** * The Job is an abstraction for tasks which have to be done * remotely because of a method invocation. *
* @version $Revision: 1.17 $ $ $Date: 2008-04-11 11:21:00 $
* @author Kay Ramme
* @see com.sun.star.lib.uno.environments.remote.ThreadID
* @see com.sun.star.lib.uno.environments.remote.IReceiver
* @since UDK1.0
*/
public class Job {
protected Job _next;
protected IReceiver _iReceiver;
protected Message _iMessage;
Object _disposeId;
protected Object _object;
public Job(Object object, IReceiver iReceiver, Message iMessage) {
_object = object;
_iReceiver = iReceiver;
_iMessage = iMessage;
}
/**
* Dispatches a queryInterface
call
*
* @return the result of the call (should be an Any
)
* @param message the parameter for the call
* @param resultClass the result type as an out parameter
* @param status the status as an out parameter
* @param o_outs the out parameters of the call as out parameters
* @param o_out_sig the out signature as an out parameter
*/
protected Object dispatch_queryInterface(Type type) {
Class zInterface = type.getTypeDescription().getZClass();
Object result = null;
Object face = UnoRuntime.queryInterface(zInterface, _object);
// the hell knows why, but empty interfaces a given back as void anys
if(face != null)
result = new Any(type, face);
return result;
}
/**
* Execute the job.
*
* @return the result of the message.
*/
public Object execute() throws Throwable {
Object msgResult = _iMessage.getResult();
if (_iMessage.isRequest()) {
Object result = null;
Throwable exception = null;
IMethodDescription md = _iMessage.getMethod();
Object[] args = _iMessage.getArguments();
XCurrentContext oldCC = UnoRuntime.getCurrentContext();
UnoRuntime.setCurrentContext(_iMessage.getCurrentContext());
try {
result = md.getIndex() == MethodDescription.ID_QUERY_INTERFACE
? dispatch_queryInterface((Type) args[0])
: md.getMethod().invoke(_object, args);
} catch (InvocationTargetException e) {
exception = e.getTargetException();
if (exception == null) {
exception = e;
}
} catch (Exception e) {
exception = e;
} finally {
UnoRuntime.setCurrentContext(oldCC);
}
if (_iMessage.isSynchronous()) {
if (exception == null) {
_iReceiver.sendReply(
false, _iMessage.getThreadId(), result);
} else {
// Here we have to be aware of non-UNO exceptions, because
// they may kill a remote side which does not know anything
// about their types:
if (exception != null
&& !(exception instanceof com.sun.star.uno.Exception)
&& !(exception instanceof
com.sun.star.uno.RuntimeException))
{
StringWriter writer = new StringWriter();
exception.printStackTrace(new PrintWriter(writer));
exception = new com.sun.star.uno.RuntimeException(
"Java exception: <" + writer + ">", null);
}
_iReceiver.sendReply(
true, _iMessage.getThreadId(), exception);
}
}
return null;
} else if (_iMessage.isAbnormalTermination()) {
throw remoteUnoRequestRaisedException(_iMessage.getResult());
} else {
return _iMessage.getResult();
}
}
public ThreadId getThreadId() {
return _iMessage.getThreadId();
}
public boolean isRequest() {
return _iMessage.isRequest();
}
public boolean isSynchronous() {
return _iMessage.isSynchronous();
}
public void dispose() {
// _oId = null;
// _iReceiver = null;
// _threadId = null;
// _object = null;
// _operation = null;
// _param = null;
// _exception = null;
// _zInterface = null;
// _disposeId = null;
}
// The name of this method is chosen to generate a somewhat self-explanatory
// stack trace:
private Exception remoteUnoRequestRaisedException(Object exception) {
Exception e = (Exception) exception;
e.fillInStackTrace();
return e;
}
}