| /* |
| * 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 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.qpid.transport.network.io; |
| |
| import org.apache.qpid.common.Closeable; |
| import org.apache.qpid.thread.Threading; |
| import org.apache.qpid.transport.Sender; |
| import org.apache.qpid.transport.SenderClosedException; |
| import org.apache.qpid.transport.SenderException; |
| import org.apache.qpid.transport.TransportException; |
| import org.apache.qpid.transport.util.Logger; |
| |
| import static org.apache.qpid.transport.util.Functions.mod; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.net.Socket; |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| |
| public final class IoSender implements Runnable, Sender<ByteBuffer> |
| { |
| |
| private static final Logger log = Logger.get(IoSender.class); |
| |
| // by starting here, we ensure that we always test the wraparound |
| // case, we should probably make this configurable somehow so that |
| // we can test other cases as well |
| private final static int START = Integer.MAX_VALUE - 10; |
| |
| private final long timeout; |
| private final Socket socket; |
| private final OutputStream out; |
| |
| private final byte[] buffer; |
| private volatile int head = START; |
| private volatile int tail = START; |
| private volatile boolean idle = true; |
| private final Object notFull = new Object(); |
| private final Object notEmpty = new Object(); |
| private final AtomicBoolean closed = new AtomicBoolean(false); |
| private final Thread senderThread; |
| private final List<Closeable> _listeners = new ArrayList<Closeable>(); |
| |
| private volatile Throwable exception = null; |
| |
| public IoSender(Socket socket, int bufferSize, long timeout) |
| { |
| this.socket = socket; |
| this.buffer = new byte[pof2(bufferSize)]; // buffer size must be a power of 2 |
| this.timeout = timeout; |
| |
| try |
| { |
| out = socket.getOutputStream(); |
| } |
| catch (IOException e) |
| { |
| throw new TransportException("Error getting output stream for socket", e); |
| } |
| |
| try |
| { |
| //Create but deliberately don't start the thread. |
| senderThread = Threading.getThreadFactory().createThread(this); |
| } |
| catch(Exception e) |
| { |
| throw new Error("Error creating IOSender thread",e); |
| } |
| |
| senderThread.setDaemon(true); |
| senderThread.setName(String.format("IoSender - %s", socket.getRemoteSocketAddress())); |
| } |
| |
| public void initiate() |
| { |
| senderThread.start(); |
| } |
| |
| private static final int pof2(int n) |
| { |
| int result = 1; |
| while (result < n) |
| { |
| result *= 2; |
| } |
| return result; |
| } |
| |
| public void send(ByteBuffer buf) |
| { |
| if (closed.get()) |
| { |
| throw new SenderClosedException("sender is closed", exception); |
| } |
| if(!senderThread.isAlive()) |
| { |
| throw new SenderException("sender thread not alive"); |
| } |
| |
| final int size = buffer.length; |
| int remaining = buf.remaining(); |
| |
| while (remaining > 0) |
| { |
| final int hd = head; |
| final int tl = tail; |
| |
| if (hd - tl >= size) |
| { |
| flush(); |
| synchronized (notFull) |
| { |
| long start = System.currentTimeMillis(); |
| long elapsed = 0; |
| while (!closed.get() && head - tail >= size && elapsed < timeout) |
| { |
| try |
| { |
| notFull.wait(timeout - elapsed); |
| } |
| catch (InterruptedException e) |
| { |
| // pass |
| } |
| elapsed += System.currentTimeMillis() - start; |
| } |
| |
| if (closed.get()) |
| { |
| throw new SenderClosedException("sender is closed", exception); |
| } |
| |
| if (head - tail >= size) |
| { |
| throw new SenderException(String.format("write timed out: %s, %s", head, tail)); |
| } |
| } |
| continue; |
| } |
| |
| final int hd_idx = mod(hd, size); |
| final int tl_idx = mod(tl, size); |
| final int length; |
| |
| if (tl_idx > hd_idx) |
| { |
| length = Math.min(tl_idx - hd_idx, remaining); |
| } |
| else |
| { |
| length = Math.min(size - hd_idx, remaining); |
| } |
| |
| buf.get(buffer, hd_idx, length); |
| head += length; |
| remaining -= length; |
| } |
| } |
| |
| public void flush() |
| { |
| if (idle) |
| { |
| synchronized (notEmpty) |
| { |
| notEmpty.notify(); |
| } |
| } |
| } |
| |
| public void close() |
| { |
| close(true); |
| } |
| |
| void close(boolean reportException) |
| { |
| if (!closed.getAndSet(true)) |
| { |
| synchronized (notFull) |
| { |
| notFull.notify(); |
| } |
| |
| synchronized (notEmpty) |
| { |
| notEmpty.notify(); |
| } |
| |
| try |
| { |
| if (Thread.currentThread() != senderThread) |
| { |
| senderThread.join(timeout); |
| if (senderThread.isAlive()) |
| { |
| log.error("join timed out"); |
| throw new SenderException("join timed out"); |
| } |
| } |
| } |
| catch (InterruptedException e) |
| { |
| log.error("interrupted whilst waiting for sender thread to stop"); |
| throw new SenderException(e); |
| } |
| finally |
| { |
| closeListeners(); |
| } |
| if (reportException && exception != null) |
| { |
| throw new SenderException(exception); |
| } |
| } |
| } |
| |
| private void closeListeners() |
| { |
| Exception ex = null; |
| for(Closeable listener : _listeners) |
| { |
| try |
| { |
| listener.close(); |
| } |
| catch(Exception e) |
| { |
| log.error("Exception closing listener: " + e.getMessage()); |
| ex = e; |
| } |
| } |
| |
| if (ex != null) |
| { |
| throw new SenderException(ex.getMessage(), ex); |
| } |
| } |
| |
| public void run() |
| { |
| final int size = buffer.length; |
| while (true) |
| { |
| final int hd = head; |
| final int tl = tail; |
| |
| if (hd == tl) |
| { |
| if (closed.get()) |
| { |
| break; |
| } |
| |
| idle = true; |
| |
| synchronized (notEmpty) |
| { |
| while (head == tail && !closed.get()) |
| { |
| try |
| { |
| notEmpty.wait(); |
| } |
| catch (InterruptedException e) |
| { |
| // pass |
| } |
| } |
| } |
| |
| idle = false; |
| |
| continue; |
| } |
| |
| final int hd_idx = mod(hd, size); |
| final int tl_idx = mod(tl, size); |
| |
| final int length; |
| if (tl_idx < hd_idx) |
| { |
| length = hd_idx - tl_idx; |
| } |
| else |
| { |
| length = size - tl_idx; |
| } |
| |
| try |
| { |
| out.write(buffer, tl_idx, length); |
| } |
| catch (IOException e) |
| { |
| log.error(e, "error in write thread"); |
| exception = e; |
| close(false); |
| break; |
| } |
| tail += length; |
| if (head - tl >= size) |
| { |
| synchronized (notFull) |
| { |
| notFull.notify(); |
| } |
| } |
| } |
| } |
| |
| public void setIdleTimeout(int i) |
| { |
| try |
| { |
| socket.setSoTimeout(i); |
| } |
| catch (Exception e) |
| { |
| throw new SenderException(e); |
| } |
| } |
| |
| public void registerCloseListener(Closeable listener) |
| { |
| _listeners.add(listener); |
| } |
| } |