diff options
Diffstat (limited to 'ridljar/com/sun/star/comp/connections/PipedConnection.java')
| -rw-r--r-- | ridljar/com/sun/star/comp/connections/PipedConnection.java | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/ridljar/com/sun/star/comp/connections/PipedConnection.java b/ridljar/com/sun/star/comp/connections/PipedConnection.java new file mode 100644 index 0000000000..631cfae40e --- /dev/null +++ b/ridljar/com/sun/star/comp/connections/PipedConnection.java @@ -0,0 +1,259 @@ +/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * 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.comp.connections; + + +import com.sun.star.comp.loader.FactoryHelper; +import com.sun.star.connection.XConnection; +import com.sun.star.lang.XMultiServiceFactory; +import com.sun.star.lang.XSingleServiceFactory; +import com.sun.star.registry.XRegistryKey; + +/** + * The <code>PipedConnection</code> is a component that implements the + * <code>XConnection</code> Interface. + * <p>It is useful for <code>Thread</code> communication in one Process.</p> + * + * @see com.sun.star.connection.XConnection + * @see com.sun.star.comp.loader.JavaLoader + * @since UDK1.0 + */ +public class PipedConnection implements XConnection { + /** + * When set to true, enables various debugging output. + */ + public static final boolean DEBUG = false; + + /** + * The name of the service, the <code>JavaLoader</code> accesses this through + * reflection. + */ + private static final String __serviceName = "com.sun.star.connection.PipedConnection"; + + /** + * Gives a factory for creating the service. + * <p>This method is called by the <code>JavaLoader</code>.</p> + * + * @param implName the name of the implementation for which a service is desired. + * @param multiFactory the service manager to be uses if needed. + * @param regKey the registryKey. + * @return returns a <code>XSingleServiceFactory</code> for creating the component. + * + * @see com.sun.star.comp.loader.JavaLoader + */ + public static XSingleServiceFactory __getServiceFactory(String implName, + XMultiServiceFactory multiFactory, + XRegistryKey regKey) + { + XSingleServiceFactory xSingleServiceFactory = null; + + if (implName.equals(PipedConnection.class.getName()) ) + xSingleServiceFactory = FactoryHelper.getServiceFactory(PipedConnection.class, + __serviceName, + multiFactory, + regKey); + + return xSingleServiceFactory; + } + + /** + * The amount of time in milliseconds, to wait to see check the buffers. + */ + protected static final int __waitTime = 10000; + + protected byte _buffer[] = new byte[4096]; + protected int _in, + _out; + protected boolean _closed; + protected PipedConnection _otherSide; + + /** + * Constructs a new <code>PipedConnection</code>, sees if there is another + * side, which it should be connected to. + * + * @param args Another side could be in index 0. + */ + public PipedConnection(Object args[]) throws com.sun.star.uno.RuntimeException { + if (DEBUG) System.err.println("##### " + getClass().getName() + " - instantiated"); + + _otherSide = (args.length == 1) ? (PipedConnection)args[0] : null; + if(_otherSide != null) { + if(_otherSide == this) + throw new RuntimeException("can not connect to myself"); + + _otherSide._otherSide = this; + } + } + + /** + * This is a private method, used to communicate internal in the pipe. + */ + private synchronized void receive(byte aData[]) throws com.sun.star.io.IOException { + int bytesWritten = 0; + + if(DEBUG) System.err.println("##### PipedConnection.receive - bytes:" + aData.length + " at:" + _out); + + while(bytesWritten < aData.length) { + // wait until it is not full anymore + while(_out == (_in - 1) || (_in == 0 && _out == _buffer.length - 1)) { + try { + notify(); // the buffer is full, signal it + + wait(__waitTime); + } + catch(InterruptedException interruptedException) { + throw new com.sun.star.io.IOException(interruptedException); + } + } + + if(_closed) throw new com.sun.star.io.IOException("connection has been closed"); + + int bytes ; + + if(_out < _in) { + bytes = Math.min(aData.length - bytesWritten, _in - _out - 1); + + System.arraycopy(aData, bytesWritten, _buffer, _out, bytes); + } + else { + if(_in > 0){ + bytes = Math.min(aData.length - bytesWritten, _buffer.length - _out); + } + else { + bytes = Math.min(aData.length - bytesWritten, _buffer.length - _out - 1); + } + + System.arraycopy(aData, bytesWritten, _buffer, _out, bytes); + } + + bytesWritten += bytes; + _out += bytes; + if(_out >= _buffer.length) + _out = 0; + } + } + + /** + * Read the required number of bytes. + * + * @param aReadBytes the out parameter, where the bytes have to be placed. + * @param nBytesToRead the number of bytes to read. + * @return the number of bytes read. + * + * @see com.sun.star.connection.XConnection#read + */ + public synchronized int read(/*OUT*/byte[][] aReadBytes, int nBytesToRead) throws com.sun.star.io.IOException, com.sun.star.uno.RuntimeException { + aReadBytes[0] = new byte[nBytesToRead]; + + if(DEBUG) System.err.println("##### PipedConnection.read - bytes:" + nBytesToRead + " at:" + _in); + + // loop while not all bytes read or when closed but there is still data + while(nBytesToRead > 0 && (_in != _out || !_closed)) { + while(_in == _out && !_closed) { + try { + notify(); // the buffer is empty, signal it + + wait(__waitTime); // we wait for data or for the pipe to be closed + } + catch(InterruptedException interruptedException) { + throw new com.sun.star.io.IOException(interruptedException); + } + } + + if(_in < _out) { + int bytes = Math.min(nBytesToRead, _out - _in); + + System.arraycopy(_buffer, _in, aReadBytes[0], aReadBytes[0].length - nBytesToRead, bytes); + + nBytesToRead -= bytes; + _in += bytes; + } + else if(_in > _out) { + int bytes = Math.min(nBytesToRead, _buffer.length - _in); + + System.arraycopy(_buffer, _in, aReadBytes[0], aReadBytes[0].length - nBytesToRead, bytes); + + nBytesToRead -= bytes; + _in += bytes; + if(_in >= _buffer.length) + _in = 0; + } + } + + if(nBytesToRead > 0) { // not all bytes read + byte tmp[] = new byte[aReadBytes[0].length - nBytesToRead]; + System.arraycopy(aReadBytes[0], 0, tmp, 0, tmp.length); + + aReadBytes[0] = tmp; + } + + return aReadBytes[0].length; + } + + /** + * Write bytes. + * + * @param aData the bytes to write. + * @see com.sun.star.connection.XConnection#write + */ + public void write(byte aData[]) throws com.sun.star.io.IOException, com.sun.star.uno.RuntimeException { + _otherSide.receive(aData); + } + + /** + * Flushes the buffer, notifies if necessary the other side that new data has + * arrived. + * + * @see com.sun.star.connection.XConnection#flush + */ + public void flush() throws com.sun.star.io.IOException, com.sun.star.uno.RuntimeException { + synchronized(_otherSide) { + _otherSide.notify(); + } + } + + /** + * Closes the pipe. + * + * @see com.sun.star.connection.XConnection#close() + */ + public synchronized void close() throws com.sun.star.io.IOException, com.sun.star.uno.RuntimeException { + if(!_closed) { + _closed = true; + + _otherSide.close(); + + notify(); + } + } + + /** + * Gives a description of this pipe. + * + * @return the description. + * @see com.sun.star.connection.XConnection#getDescription + */ + public String getDescription() throws com.sun.star.uno.RuntimeException { + return getClass().getName(); + } + +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |