Examples of net.spy.memcached.ops.Operation

net.spy.memcached.ops.Operation
Base interface for all operations.

  public OperationFuture<Map<String, String>> getKeyStats(String key) {
    final CountDownLatch latch = new CountDownLatch(1);
    final OperationFuture<Map<String, String>> rv =
        new OperationFuture<Map<String, String>>(key, latch, operationTimeout,
          executorService);
    Operation op = opFact.keyStats(key, new StatsOperation.Callback() {
      private final Map<String, String> stats = new HashMap<String, String>();
      public void gotStat(String name, String val) {
        stats.put(name, val);
      }

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      if (!node.isActive()) {
        cf.checkConfigUpdate();
      }


      Operation o = me.getValue();
      // add the vbucketIndex to the operation
      if (locator instanceof VBucketNodeLocator) {
        if (o instanceof KeyedOperation && o instanceof VBucketAware) {
          Collection<String> keys = ((KeyedOperation) o).getKeys();
          VBucketNodeLocator vbucketLocator = (VBucketNodeLocator) locator;
          for (String key : keys) {
            short vbucketIndex = (short) vbucketLocator.getVBucketIndex(key);
            VBucketAware vbucketAwareOp = (VBucketAware) o;
            vbucketAwareOp.setVBucket(key, vbucketIndex);
          }
        }
      }
      o.setHandlingNode(node);
      o.initialize();
      node.addOp(o);
      addedQueue.offer(node);
    }
    Selector s = selector.wakeup();
    assert s == selector : "Wakeup returned the wrong selector.";

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    final CountDownLatch latch = new CountDownLatch(1);
    final OperationFuture<CASValue<T>> rv =
        new OperationFuture<CASValue<T>>(key, latch, operationTimeout,
          executorService);


    Operation op = opFact.getl(key, exp, new GetlOperation.Callback() {
      private CASValue<T> val = null;


      public void receivedStatus(OperationStatus status) {
        if (!status.isSuccess()) {
          val = new CASValue<T>(-1, null);

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    for(int index : actualReplicaIndexes) {
      final CountDownLatch latch = new CountDownLatch(1);
      final GetFuture<T> rv =
        new GetFuture<T>(latch, operationTimeout, key, executorService);
      Operation op = createOperationForReplicaGet(key, rv, replicaFuture,
        latch, tc, index, true);


      rv.setOperation(op);
      mconn.enqueueOperation(key, op);


      if (op.isCancelled()) {
        discardedOps++;
        getLogger().debug("Silently discarding replica get for key \""
          + key + "\" (cancelled).");
      } else {
        replicaFuture.addFutureToMonitor(rv);
      }


    }


    if (locator.hasActiveMaster(key)) {
      final CountDownLatch latch = new CountDownLatch(1);
      final GetFuture<T> additionalActiveGet = new GetFuture<T>(latch, operationTimeout, key,
        executorService);
      Operation op = createOperationForReplicaGet(key, additionalActiveGet,
        replicaFuture, latch, tc, 0, false);
      additionalActiveGet.setOperation(op);
      mconn.enqueueOperation(key, op);


      if (op.isCancelled()) {
        discardedOps++;
        getLogger().debug("Silently discarding replica (active) get for key \""
          + key + "\" (cancelled).");
      } else {
        replicaFuture.addFutureToMonitor(additionalActiveGet);

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    for(int index : actualReplicaIndexes) {
      final CountDownLatch latch = new CountDownLatch(1);
      final OperationFuture<CASValue<T>> rv =
        new OperationFuture<CASValue<T>>(key, latch, operationTimeout, executorService);
      Operation op = createOperationForReplicaGets(key, rv, replicaFuture,
        latch, tc, index, true);


      rv.setOperation(op);
      mconn.enqueueOperation(key, op);


      if (op.isCancelled()) {
        discardedOps++;
        getLogger().debug("Silently discarding replica get for key \""
          + key + "\" (cancelled).");
      } else {
        replicaFuture.addFutureToMonitor(rv);
      }


    }


    if (locator.hasActiveMaster(key)) {
      final CountDownLatch latch = new CountDownLatch(1);
      final OperationFuture<CASValue<T>> additionalActiveGet =
        new OperationFuture<CASValue<T>>(key, latch, operationTimeout, executorService);
      Operation op = createOperationForReplicaGets(key, additionalActiveGet,
        replicaFuture, latch, tc, 0, false);
      additionalActiveGet.setOperation(op);
      mconn.enqueueOperation(key, op);


      if (op.isCancelled()) {
        discardedOps++;
        getLogger().debug("Silently discarding replica (active) get for key \""
          + key + "\" (cancelled).");
      } else {
        replicaFuture.addFutureToMonitor(additionalActiveGet);

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  public <T> OperationFuture<Boolean> asyncUnlock(final String key,
          long casId, final Transcoder<T> tc) {
    final CountDownLatch latch = new CountDownLatch(1);
    final OperationFuture<Boolean> rv = new OperationFuture<Boolean>(key,
            latch, operationTimeout, executorService);
    Operation op = opFact.unlock(key, casId, new OperationCallback() {


      @Override
      public void receivedStatus(OperationStatus s) {
        rv.set(s.isSuccess(), s);
      }

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  public OperationFuture<Map<String, String>> getKeyStats(String key) {
    final CountDownLatch latch = new CountDownLatch(1);
    final OperationFuture<Map<String, String>> rv =
        new OperationFuture<Map<String, String>>(key, latch, operationTimeout,
          executorService);
    Operation op = opFact.keyStats(key, new StatsOperation.Callback() {
      private final Map<String, String> stats = new HashMap<String, String>();
      public void gotStat(String name, String val) {
        stats.put(name, val);
      }

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    }
  }


  private void handleReads(SelectionKey sk, MemcachedNode qa)
    throws IOException {
    Operation currentOp = qa.getCurrentReadOp();
    ByteBuffer rbuf=qa.getRbuf();
    final SocketChannel channel = qa.getChannel();
    int read=channel.read(rbuf);
    if (read < 0) {
        // our model is to keep the connection alive for future ops
        // so we'll queue a reconnect if disconnected via an IOException
        throw new IOException("Disconnected unexpected, will reconnect.");
    }
    while(read > 0) {
      getLogger().debug("Read %d bytes", read);
      rbuf.flip();
      while(rbuf.remaining() > 0) {
        if(currentOp == null) {
          throw new IllegalStateException("No read operation.");
        }
        currentOp.readFromBuffer(rbuf);
        if(currentOp.getState() == OperationState.COMPLETE) {
          getLogger().debug(
              "Completed read op: %s and giving the next %d bytes",
              currentOp, rbuf.remaining());
          Operation op=qa.removeCurrentReadOp();
          assert op == currentOp
          : "Expected to pop " + currentOp + " got " + op;
          currentOp=qa.getCurrentReadOp();
        }
      }

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  public void addOperations(final Map<MemcachedNode, Operation> ops) {


    for(Map.Entry<MemcachedNode, Operation> me : ops.entrySet()) {
      final MemcachedNode node=me.getKey();
      Operation o=me.getValue();
      o.setHandlingNode(node);
      o.initialize();
      node.addOp(o);
      addedQueue.offer(node);
    }
    Selector s=selector.wakeup();
    assert s == selector : "Wakeup returned the wrong selector.";

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   */
  public CountDownLatch broadcastOperation(final BroadcastOpFactory of,
      Collection<MemcachedNode> nodes) {
    final CountDownLatch latch=new CountDownLatch(locator.getAll().size());
    for(MemcachedNode node : nodes) {
      Operation op = of.newOp(node, latch);
      op.initialize();
      node.addOp(op);
      op.setHandlingNode(node);
      addedQueue.offer(node);
    }
    Selector s=selector.wakeup();
    assert s == selector : "Wakeup returned the wrong selector.";
    return latch;

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