Moved most of the message handling to other classes.
I'm finding that this code is being used multiple times, so inheritance seems to be warranted.
This commit is contained in:
Markil3
@@ -0,0 +1,260 @@
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/*
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* Copyright (c) 2021 William Hubbard. All Rights Reserved.
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*/
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package edu.regis.universeplayer.browserCommands;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.*;
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import java.nio.ByteBuffer;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.LinkedList;
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import java.util.Map;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.Future;
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/**
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*
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*/
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public class MessageHandler implements Runnable, MessageSerializer
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{
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private static final Logger logger = LoggerFactory.getLogger(MessageHandler.class);
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private final InputStream input;
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private final OutputStream output;
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private final ExecutorService executor;
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private final LinkedList<MessageListener> listeners = new LinkedList<>();
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private final HashMap<Integer, Future<Object>> messageResponses = new HashMap<>();
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/**
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* Creates a message handler.
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*
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* @param input - The input from our external source.
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* @param output - The output to the external source.
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*/
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public MessageHandler(InputStream input, OutputStream output)
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{
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this.input = input;
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this.output = output;
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this.executor = Executors.newCachedThreadPool();
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}
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@Override
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public void run()
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{
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BufferedInputStream browserIn = null;
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BufferedOutputStream browserOut = null;
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boolean running = true;
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byte[][] message;
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byte[] messageByte;
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Object messageOb;
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Future<Object> messageResponse;
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ByteBuffer numBuffer = ByteBuffer.allocate(4);
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HashSet<Integer> toRemove = new HashSet<>();
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try
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{
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browserIn = new BufferedInputStream(this.input);
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browserOut = new BufferedOutputStream(this.output);
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while (running)
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{
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try
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{
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if (browserIn.available() > 0)
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{
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message = this.readMessage(browserIn);
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if (message == null)
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{
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logger.info("Connection closed.");
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running = false;
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}
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else
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{
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numBuffer.clear();
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numBuffer.put(message[0]);
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messageOb = this.deserializeObject(message[1]);
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messageResponse = this.triggerListeners(messageOb);
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synchronized (this.messageResponses)
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{
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this.messageResponses.put(numBuffer.getInt(), messageResponse);
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}
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}
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}
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}
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catch (IOException | ClassNotFoundException e)
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{
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logger.error("Could not retrieve message", e);
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}
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/*
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* Returns any finished responses.
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*/
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synchronized (this.messageResponses)
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{
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if (this.messageResponses.size() > 0)
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{
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for (Map.Entry<Integer, Future<Object>> responses : this.messageResponses.entrySet())
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{
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try
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{
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if (responses.getValue().isDone())
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{
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toRemove.add(responses.getKey());
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messageByte = serializeObject(responses.getValue());
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writeMessage(browserOut, responses.getKey(), messageByte);
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}
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}
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catch (IOException e)
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{
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logger.error("Could not send response message for " + responses.getKey(), e);
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}
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}
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toRemove.forEach(this.messageResponses::remove);
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toRemove.clear();
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}
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}
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}
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}
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finally
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{
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/*
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* Release locks for any messages still waiting.
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*/
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synchronized (this.messageResponses)
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{
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this.messageResponses.values().forEach(future -> future.cancel(false));
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}
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/*
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* Close the streams.
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*/
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try
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{
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if (browserIn != null)
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{
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browserIn.close();
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}
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}
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catch (IOException e1)
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{
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logger.error("Could not close browser input", e1);
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}
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finally
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{
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try
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{
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if (browserOut != null)
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{
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browserOut.close();
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}
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}
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catch (IOException e1)
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{
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logger.error("Could not close browser output", e1);
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}
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}
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}
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}
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/**
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* Triggers the message listeners.
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*
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* @param message - The message to send.
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* @return The value returned by the listeners.
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*/
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protected Future<Object> triggerListeners(Object message)
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{
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MessageListener[] listeners;
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Future<Object> returnVal;
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/*
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* Copies the list of listeners, so we have an unchanging array without
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* holding onto the list for the whole time of execution.
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*/
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synchronized (this.listeners)
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{
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listeners = this.listeners.toArray(MessageListener[]::new);
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}
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returnVal = this.executor.submit(() -> {
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Object returnValue = null;
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for (MessageListener listener : listeners)
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{
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returnValue = listener.onMessage(message, returnValue);
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}
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return returnValue;
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});
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return returnVal;
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}
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/**
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* Adds a message listener
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*
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* @param listener - A callback for when a message arrives. A value needs to
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* be returned from one of the listeners.
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*/
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public void addListener(MessageListener listener)
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{
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synchronized (this.listeners)
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{
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this.listeners.add(listener);
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}
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}
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/**
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* Checks to see if a listener has been added to the list.
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*
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* @param listener - A callback for when a message arrives.
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* @return True if the provided listener is part of the list, false otherwise.
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*/
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public boolean hasListener(MessageListener listener)
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{
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synchronized (this.listeners)
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{
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return this.listeners.contains(listener);
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}
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}
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/**
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* Removes a message listener from the list.
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*
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* @param listener - A callback for when a message arrives.
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*/
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public void removeListener(MessageListener listener)
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{
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synchronized (this.listeners)
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{
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this.listeners.remove(listener);
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}
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}
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/**
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* A message listener is called when a message is sent from the remote.
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*
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* @see #addListener(MessageListener)
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* @see #hasListener(MessageListener)
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* @see #removeListener(MessageListener)
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*/
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public interface MessageListener
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{
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/**
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* Called when the remote sends a message and wants a response.
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*
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* @param providedValue - The message sent from the remote.
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* @param previousReturn The value that was returned by the previous
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* listener called. A value must be returned to
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* the remote. The listener either has the option
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* of returning this value, or returning a new
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* value. If null, then this is either the first
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* listener called or none of the other listeners
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* have generated return values.
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* @return The value to be returned to the remote.
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*/
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Object onMessage(Object providedValue, Object previousReturn);
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}
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}
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@@ -0,0 +1,372 @@
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/*
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* Copyright (c) 2021 William Hubbard. All Rights Reserved.
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*/
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package edu.regis.universeplayer.browserCommands;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.*;
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import java.nio.ByteBuffer;
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import java.nio.charset.StandardCharsets;
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import java.util.HashMap;
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import java.util.LinkedList;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.Future;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.TimeoutException;
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/**
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* This class serves as a general inter-process object messaging system.
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*/
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public abstract class MessageRunner implements Runnable, MessageSerializer
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{
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private static final Logger logger = LoggerFactory.getLogger(MessageRunner.class);
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private final InputStream input;
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private final OutputStream output;
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private final Object readLock = new Object();
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/**
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* This queue serves as a cache for objects we need to send.
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*/
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private final LinkedList<MessagePacket> sendQueue = new LinkedList<>();
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/**
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* This queue serves as a cache for objects that are waiting for a response.
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*/
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private final HashMap<Integer, MessagePacket> sentQueue = new HashMap<>();
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private int messagesSent = 0;
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/**
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* Creates a message runner.
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*
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* @param input - The input from our external source.
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* @param output - The output to the external source.
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*/
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public MessageRunner(InputStream input, OutputStream output)
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{
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this.input = input;
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this.output = output;
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}
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@Override
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public void run()
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{
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BufferedInputStream browserIn = null;
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BufferedOutputStream browserOut = null;
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MessagePacket packet;
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boolean running = true;
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byte[][] returnMessage;
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ByteBuffer numBuffer = ByteBuffer.allocate(4);
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try
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{
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browserIn = new BufferedInputStream(this.input);
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browserOut = new BufferedOutputStream(this.output);
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while (running)
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{
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/*
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* Sends a messages
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*/
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synchronized (this.sendQueue)
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{
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packet = this.sendQueue.poll();
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}
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if (packet != null)
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{
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try
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{
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packet.returnValue.index = this.messagesSent;
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writeMessage(browserOut, this.messagesSent, packet.message);
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synchronized (this.sentQueue)
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{
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this.sentQueue.put(this.messagesSent, packet);
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this.messagesSent++;
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}
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}
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catch (IOException e)
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{
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logger.error("Could not send message " + new String(packet.message, StandardCharsets.UTF_8), e);
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}
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}
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/*
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* Reads any available messages
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*/
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try
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{
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if (!this.sentQueue.isEmpty())
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{
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if (browserIn.available() > 0)
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{
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/*
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* Wait for a response from the browser.
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*/
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returnMessage = this.readMessage(browserIn);
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if (returnMessage == null)
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{
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logger.info("Connection closed.");
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running = false;
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}
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else
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{
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numBuffer.clear();
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numBuffer.put(returnMessage[0]);
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numBuffer.clear();
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packet = this.sentQueue.get(numBuffer.getInt());
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if (packet == null)
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{
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numBuffer.clear();
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logger.warn("Received message {} for nonexistant packet", numBuffer.getInt());
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}
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else
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{
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packet.returnMessage = returnMessage[1];
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numBuffer.clear();
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logger.debug("Reading message {} {}", numBuffer.getInt(), packet.returnMessage);
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synchronized (this.readLock)
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{
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logger.trace("Received message {}, notifying futures.", packet.returnValue.index);
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this.readLock.notifyAll();
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}
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}
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}
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}
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}
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}
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catch (IOException e)
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{
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logger.error("Could not retrieve message", e);
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}
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}
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}
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finally
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{
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/*
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* Release locks for any messages still waiting.
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*/
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synchronized (this.sendQueue)
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{
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while (this.sendQueue.size() > 0)
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{
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packet = this.sendQueue.poll();
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packet.returnMessage = null;
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}
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}
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synchronized (this.readLock)
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{
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this.readLock.notifyAll();
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}
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/*
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* Close the streams.
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*/
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try
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{
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if (browserIn != null)
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{
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browserIn.close();
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}
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}
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catch (IOException e1)
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{
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logger.error("Could not close browser input", e1);
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}
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finally
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{
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try
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{
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if (browserOut != null)
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{
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browserOut.close();
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}
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}
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catch (IOException e1)
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{
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logger.error("Could not close browser output", e1);
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}
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}
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}
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}
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/**
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* Sends an object to the remote.
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*
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* @param message - The message to send.
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* @return A future for whatever the remote may return.
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* @throws IOException Should an error occur in serializing the object.
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*/
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public Future<Object> sendObject(Object message) throws IOException
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{
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byte[] messageData = this.serializeObject(message);
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MessagePacket packetEntry = new MessagePacket(messageData);
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MessageFuture future = new MessageFuture(packetEntry);
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synchronized (this.sendQueue)
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{
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sendQueue.add(packetEntry);
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}
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return future;
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}
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/**
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* This represents a sent message in storage.
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*/
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public static class MessagePacket
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{
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public final byte[] message;
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public byte[] returnMessage;
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public MessageFuture returnValue;
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public MessagePacket(byte[] message)
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{
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this(message, null);
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}
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public MessagePacket(byte[] message, MessageFuture returnValue)
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{
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this.message = message;
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this.returnValue = returnValue;
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}
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}
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/**
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* This future waits for a return message from the runner.
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*/
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public class MessageFuture implements Future<Object>
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{
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private final MessagePacket packetEntry;
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private int index;
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private boolean canceled = false;
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private MessageFuture(MessagePacket packet)
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{
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this.packetEntry = packet;
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packet.returnValue = this;
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}
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@Override
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public boolean cancel(boolean mayInterruptIfRunning)
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{
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synchronized (sendQueue)
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{
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if (sendQueue.remove(this.packetEntry))
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{
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this.canceled = true;
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if (mayInterruptIfRunning)
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{
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logger.trace("Canceling future, notifying self futures.");
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synchronized (sentQueue)
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{
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sentQueue.remove(this.index);
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}
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synchronized (readLock)
|
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{
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readLock.notifyAll();
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}
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}
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else
|
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{
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logger.trace("Canceling future.");
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}
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return true;
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}
|
||||
else
|
||||
{
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return false;
|
||||
}
|
||||
}
|
||||
}
|
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|
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@Override
|
||||
public boolean isCancelled()
|
||||
{
|
||||
return this.canceled;
|
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}
|
||||
|
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@Override
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public boolean isDone()
|
||||
{
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return this.packetEntry.returnMessage != null;
|
||||
}
|
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|
||||
@Override
|
||||
public Object get() throws InterruptedException, ExecutionException
|
||||
{
|
||||
if (this.isDone())
|
||||
{
|
||||
try
|
||||
{
|
||||
return deserializeObject(this.packetEntry.returnMessage);
|
||||
}
|
||||
catch (IOException | ClassNotFoundException e)
|
||||
{
|
||||
throw new ExecutionException("Error parsing object", e);
|
||||
}
|
||||
}
|
||||
synchronized (readLock)
|
||||
{
|
||||
while (!this.canceled && packetEntry.returnMessage == null)
|
||||
{
|
||||
logger.trace("Future {} waiting for message", this.index);
|
||||
readLock.wait();
|
||||
}
|
||||
}
|
||||
if (packetEntry.returnMessage == null)
|
||||
{
|
||||
throw new InterruptedException();
|
||||
}
|
||||
logger.trace("Future {} has received message", this.index);
|
||||
try
|
||||
{
|
||||
return deserializeObject(this.packetEntry.returnMessage);
|
||||
}
|
||||
catch (IOException | ClassNotFoundException e)
|
||||
{
|
||||
throw new ExecutionException("Error parsing object", e);
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public Object get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException
|
||||
{
|
||||
if (this.isDone())
|
||||
{
|
||||
try
|
||||
{
|
||||
return deserializeObject(this.packetEntry.returnMessage);
|
||||
}
|
||||
catch (IOException | ClassNotFoundException e)
|
||||
{
|
||||
throw new ExecutionException("Error parsing object", e);
|
||||
}
|
||||
}
|
||||
synchronized (readLock)
|
||||
{
|
||||
while (!this.canceled && packetEntry.returnMessage == null)
|
||||
{
|
||||
logger.trace("Future {} waiting for message", this.index);
|
||||
readLock.wait(unit.toMillis(timeout));
|
||||
}
|
||||
}
|
||||
if (packetEntry.returnMessage == null)
|
||||
{
|
||||
throw new InterruptedException();
|
||||
}
|
||||
logger.trace("Future {} has received message", this.index);
|
||||
try
|
||||
{
|
||||
return deserializeObject(this.packetEntry.returnMessage);
|
||||
}
|
||||
catch (IOException | ClassNotFoundException e)
|
||||
{
|
||||
throw new ExecutionException("Error parsing object", e);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,138 @@
|
||||
/*
|
||||
* Copyright (c) 2021 William Hubbard. All Rights Reserved.
|
||||
*/
|
||||
|
||||
package edu.regis.universeplayer.browserCommands;
|
||||
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
|
||||
import java.io.*;
|
||||
import java.nio.ByteBuffer;
|
||||
|
||||
public interface MessageSerializer
|
||||
{
|
||||
Logger logger = LoggerFactory.getLogger(MessageSerializer.class);
|
||||
|
||||
/**
|
||||
* Converts an object into a form that can be sent.
|
||||
*
|
||||
* @param message - The message to send.
|
||||
* @return The byte array representation of that object.
|
||||
* @throws IOException Should a serialization error occur.
|
||||
*/
|
||||
default byte[] serializeObject(Object message) throws IOException
|
||||
{
|
||||
try (ByteArrayOutputStream byteStream = new ByteArrayOutputStream())
|
||||
{
|
||||
try (ObjectOutputStream stream = new ObjectOutputStream(byteStream))
|
||||
{
|
||||
stream.writeObject(message);
|
||||
}
|
||||
return byteStream.toByteArray();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Converts a byte stream into an object.
|
||||
*
|
||||
* @param message - The message received.
|
||||
* @return An object.
|
||||
* @throws IOException If there is an error in parsing the message.
|
||||
* @throws ClassNotFoundException If the object is not recognized
|
||||
*/
|
||||
default Object deserializeObject(byte[] message) throws IOException, ClassNotFoundException
|
||||
{
|
||||
try (ByteArrayInputStream byteStream = new ByteArrayInputStream(message))
|
||||
{
|
||||
try (ObjectInputStream stream = new ObjectInputStream(byteStream))
|
||||
{
|
||||
return stream.readObject();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Writes a message to the output stream.
|
||||
*
|
||||
* @param out - The output stream to write to.
|
||||
* @param messageNum - The ID of the message being sent. This will help keep track of responses.
|
||||
* @param message - The actual message contents to write.
|
||||
* @throws IOException Thrown when an exception occures
|
||||
*/
|
||||
default void writeMessage(OutputStream out, int messageNum, byte[] message) throws IOException
|
||||
{
|
||||
ByteBuffer lengthBuffer = ByteBuffer.allocate(4);
|
||||
logger.debug("Writing message {} {}", messageNum, message);
|
||||
/*
|
||||
* Writes the message number.
|
||||
*/
|
||||
lengthBuffer.clear();
|
||||
lengthBuffer.putInt(messageNum);
|
||||
out.write(lengthBuffer.array());
|
||||
/*
|
||||
* Writes the message length
|
||||
*/
|
||||
/*
|
||||
* Wipe out the buffer
|
||||
*/
|
||||
lengthBuffer.clear();
|
||||
lengthBuffer.put(new byte[4]);
|
||||
lengthBuffer.clear();
|
||||
lengthBuffer.putInt(message.length);
|
||||
out.write(lengthBuffer.array());
|
||||
/*
|
||||
* Writes the message
|
||||
*/
|
||||
out.write(message);
|
||||
out.flush();
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads a message from the input stream
|
||||
*
|
||||
* @param in - The input stream to read from.
|
||||
* @return Two byte arrays, each with their own value encoded. The first is
|
||||
* a 4-byte representation of the message number this response corresponds
|
||||
* to. The second array is the message itself. If the stream has been
|
||||
* closed, null is returned.
|
||||
* @throws IOException Thrown when an exception occurs reading a message.
|
||||
*/
|
||||
default byte[][] readMessage(InputStream in) throws IOException
|
||||
{
|
||||
int readLength;
|
||||
ByteBuffer lengthBuffer = ByteBuffer.allocate(4);
|
||||
byte[] messageNum = new byte[4];
|
||||
byte[] message;
|
||||
/*
|
||||
* Reads the message number.
|
||||
*/
|
||||
readLength = in.read(messageNum);
|
||||
if (readLength == 0)
|
||||
{
|
||||
logger.debug("Input stream closed, no more messages.");
|
||||
return null;
|
||||
}
|
||||
/*
|
||||
* Reads the message length
|
||||
*/
|
||||
lengthBuffer.clear();
|
||||
readLength = in.read(lengthBuffer.array());
|
||||
if (readLength == 0)
|
||||
{
|
||||
logger.error("Malformed message, could not get message length.");
|
||||
return null;
|
||||
}
|
||||
message = new byte[lengthBuffer.getInt()];
|
||||
/*
|
||||
* Writes the message
|
||||
*/
|
||||
readLength = in.read(message);
|
||||
if (readLength < message.length)
|
||||
{
|
||||
logger.warn("Message shorter than reported (expected {} bytes, got {} bytes)", message.length, readLength);
|
||||
}
|
||||
logger.debug("Reading message");
|
||||
return new byte[][] {messageNum, message};
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user