AsynchWriteAsynchChannelAdapter xref

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    1   package org.activeio.adapter;
    2
    3   import java.io.IOException;
    4   import java.io.InterruptedIOException;
    5
    6   import org.activeio.AsynchChannel;
    7   import org.activeio.ChannelFactory;
    8   import org.activeio.FilterAsynchChannel;
    9   import org.activeio.Packet;
    10
    11  import EDU.oswego.cs.dl.util.concurrent.BoundedBuffer;
    12  import EDU.oswego.cs.dl.util.concurrent.Channel;
    13  import EDU.oswego.cs.dl.util.concurrent.Executor;
    14  import EDU.oswego.cs.dl.util.concurrent.Latch;
    15  import EDU.oswego.cs.dl.util.concurrent.PooledExecutor;
    16  import EDU.oswego.cs.dl.util.concurrent.SynchronizedInt;
    17
    18  public class AsynchWriteAsynchChannelAdapter extends FilterAsynchChannel {
    19
    20      static public class ObjectDispatcherX implements Runnable {
    21
    22          private final Executor executor;
    23          private final Channel queue;
    24          private final SynchronizedInt size = new SynchronizedInt(0);
    25          private final AsynchWriteAsynchChannelAdapter objectListener;
    26          private long pollDelay=10;
    27
    28          public ObjectDispatcherX(AsynchWriteAsynchChannelAdapter objectListener) {
    29              this(objectListener, 10);
    30          }
    31
    32          public ObjectDispatcherX(AsynchWriteAsynchChannelAdapter objectListener, int queueSize) {
    33              this(objectListener, ChannelFactory.DEFAULT_EXECUTOR, new BoundedBuffer(queueSize));
    34          }
    35
    36          public ObjectDispatcherX(AsynchWriteAsynchChannelAdapter objectListener, Executor executor, Channel queue) {
    37              this.objectListener = objectListener;
    38              this.executor = executor;
    39              this.queue=queue;
    40          }
    41
    42          public void add(Object o) throws InterruptedException {
    43              int t = size.increment();
    44              queue.put(o);
    45              if( t==1 ) {
    46                  executor.execute(this);
    47              }
    48          }
    49
    50          synchronized public void run() {
    51              int t = size.get();
    52              while( t > 0 ) {
    53                  int count=0;
    54                  try {
    55                      Object o;
    56                      while( (o=queue.poll(pollDelay))!=null ) {
    57                          count++;
    58                          objectListener.onObject(o);
    59                      }
    60                  } catch (InterruptedException e) {
    61                      Thread.currentThread().interrupt();
    62                      return;
    63                  } finally {
    64                      t = size.subtract(count);
    65                  }
    66              }
    67          }
    68
    69      }
    70      static public class ObjectDispatcher {
    71
    72          private final PooledExecutor executor;
    73          private final AsynchWriteAsynchChannelAdapter objectListener;
    74
    75          public ObjectDispatcher(AsynchWriteAsynchChannelAdapter objectListener) {
    76              this(objectListener, 10);
    77          }
    78
    79          public ObjectDispatcher(AsynchWriteAsynchChannelAdapter objectListener, int queueSize) {
    80              this.objectListener = objectListener;
    81              executor = new PooledExecutor(new BoundedBuffer(queueSize), 1);
    82              executor.waitWhenBlocked();
    83          }
    84
    85          public void add(final Object o) throws InterruptedException {
    86              executor.execute(new Runnable(){
    87                  public void run() {
    88                      objectListener.onObject(o);
    89                  }
    90              });
    91          }
    92      }
    93
    94      private final ObjectDispatcher dispatcher;
    95      private static final Object FLUSH_COMMAND = new Object();
    96
    97      public AsynchWriteAsynchChannelAdapter(AsynchChannel next) {
    98          this(next, 10);
    99      }
    100
    101     public AsynchWriteAsynchChannelAdapter(AsynchChannel next, int queueSize) {
    102         super(next);
    103         this.dispatcher = new ObjectDispatcher(this, queueSize);
    104     }
    105
    106     public void onObject(Object o) {
    107         try {
    108             if( o == FLUSH_COMMAND ) {
    109                 next.flush();
    110                 return;
    111             }
    112             if( o.getClass() == Latch.class ) {
    113                 next.flush();
    114                 ((Latch)o).release();
    115                 return;
    116             }
    117             next.write((Packet)o);
    118         } catch (IOException e) {
    119             channelListener.onPacketError(e);
    120         }
    121     }
    122
    123     public void write(Packet packet) throws IOException {
    124         try {
    125             dispatcher.add(packet);
    126         } catch (InterruptedException e) {
    127             throw new InterruptedIOException();
    128         }
    129     }
    130
    131     public void flush() throws IOException {
    132         flush(NO_WAIT_TIMEOUT);
    133     }
    134
    135     public void stop(long timeout) throws IOException {
    136         flush(WAIT_FOREVER_TIMEOUT);
    137     }
    138
    139
    140     /***
    141      * @param timeout
    142      * @throws InterruptedIOException
    143      */
    144     private void flush(long timeout) throws InterruptedIOException {
    145         try {
    146             if( timeout == NO_WAIT_TIMEOUT ) {
    147                 dispatcher.add(FLUSH_COMMAND);
    148             } else if( timeout == WAIT_FOREVER_TIMEOUT ) {
    149                 Latch l = new Latch();
    150                 dispatcher.add(l);
    151                 l.acquire();
    152             } else {
    153                 Latch l = new Latch();
    154                 dispatcher.add(l);
    155                 l.attempt(timeout);
    156             }
    157         } catch (InterruptedException e) {
    158             throw new InterruptedIOException();
    159         }
    160     }
    161 }