/*
* $Id: StdioMessageReceiver.java 20321 2010-11-24 15:21:24Z dfeist $
* --------------------------------------------------------------------------------------
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
*
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.transport.stdio;
import org.mule.api.MuleMessage;
import org.mule.api.construct.FlowConstruct;
import org.mule.api.endpoint.InboundEndpoint;
import org.mule.api.lifecycle.CreateException;
import org.mule.api.transport.Connector;
import org.mule.transport.AbstractPollingMessageReceiver;
import java.io.InputStream;
import java.io.PrintStream;
import java.io.PushbackInputStream;
import org.apache.commons.lang.BooleanUtils;
import org.apache.commons.lang.SystemUtils;
/**
* <code>StdioMessageReceiver</code> is a listener for events from Mule components
* which then simply passes the events on to the target components.
*/
public class StdioMessageReceiver extends AbstractPollingMessageReceiver
{
public static final int DEFAULT_BUFFER_SIZE = 4096;
private int bufferSize = DEFAULT_BUFFER_SIZE;
private InputStream inputStream;
private StdioConnector connector;
private boolean sendStream;
public StdioMessageReceiver(Connector connector,
FlowConstruct flowConstruct,
InboundEndpoint endpoint,
long checkFrequency) throws CreateException
{
super(connector, flowConstruct, endpoint);
this.setFrequency(checkFrequency);
this.connector = (StdioConnector) connector;
String streamName = endpoint.getEndpointURI().getAddress();
if (StdioConnector.STREAM_SYSTEM_IN.equalsIgnoreCase(streamName))
{
inputStream = System.in;
}
else
{
inputStream = this.connector.getInputStream();
}
// apply connector-specific properties
if (connector instanceof PromptStdioConnector)
{
PromptStdioConnector ssc = (PromptStdioConnector) connector;
String promptMessage = (String) endpoint.getProperties().get("promptMessage");
if (promptMessage != null)
{
ssc.setPromptMessage(promptMessage);
}
}
this.sendStream = BooleanUtils.toBoolean((String) endpoint.getProperties().get("sendStream"));
}
@Override
protected void doDispose()
{
// template method
}
@Override
public void doConnect() throws Exception
{
if (connector instanceof PromptStdioConnector)
{
PromptStdioConnector ssc = (PromptStdioConnector) connector;
DelayedMessageWriter writer = new DelayedMessageWriter(ssc);
writer.start();
}
}
@Override
public void doDisconnect() throws Exception
{
// noop
}
@Override
public void poll()
{
String encoding = endpoint.getEncoding();
try
{
if (sendStream)
{
PushbackInputStream in = new PushbackInputStream(inputStream);
//Block until we have some data
int i = in.read();
//Roll back our read
in.unread(i);
MuleMessage message = createMuleMessage(in, encoding);
routeMessage(message);
}
else
{
byte[] inputBuffer = new byte[bufferSize];
int len = inputStream.read(inputBuffer);
if (len == -1)
{
return;
}
StringBuffer fullBuffer = new StringBuffer(bufferSize);
while (len > 0)
{
fullBuffer.append(new String(inputBuffer, 0, len));
len = 0; // mark as read
if (inputStream.available() > 0)
{
len = inputStream.read(inputBuffer);
}
}
// Each line is a separate message
String[] lines = fullBuffer.toString().split(SystemUtils.LINE_SEPARATOR);
for (int i = 0; i < lines.length; ++i)
{
MuleMessage message = createMuleMessage(lines[i], encoding);
routeMessage(message);
}
}
doConnect();
}
catch (Exception e)
{
getConnector().getMuleContext().getExceptionListener().handleException(e);
}
}
public InputStream getInputStream()
{
return inputStream;
}
public void setInputStream(InputStream inputStream)
{
this.inputStream = inputStream;
}
public int getBufferSize()
{
return bufferSize;
}
public void setBufferSize(int bufferSize)
{
this.bufferSize = bufferSize;
}
private class DelayedMessageWriter extends Thread
{
private long delay = 0;
private PromptStdioConnector ssc;
public DelayedMessageWriter(PromptStdioConnector ssc)
{
this.delay = ssc.getMessageDelayTime();
this.ssc = ssc;
}
@Override
public void run()
{
if (delay > 0)
{
try
{
// Allow all other console message to be printed out first
sleep(delay);
}
catch (InterruptedException e1)
{
// ignore
}
}
((PrintStream) ssc.getOutputStream()).println();
((PrintStream) ssc.getOutputStream()).print(ssc.getPromptMessage());
}
}
}