Example usage for java.util.concurrent Exchanger Exchanger

Introduction

In this page you can find the example usage for java.util.concurrent Exchanger Exchanger.

Prototype

public Exchanger() 

Source Link

Document

Creates a new Exchanger.

Usage

From source file:org.apache.camel.component.sjms.producer.InOutProducer.java

/**
 * TODO time out is actually double as it waits for the producer and then
 * waits for the response. Use an atomic long to manage the countdown
 *///from   w  ww.  jav  a 2  s  . c om
@Override
public void sendMessage(final Exchange exchange, final AsyncCallback callback,
        final MessageProducerResources producer) throws Exception {
    if (isEndpointTransacted()) {
        exchange.getUnitOfWork().addSynchronization(
                new SessionTransactionSynchronization(producer.getSession(), getCommitStrategy()));
    }

    Message request = JmsMessageHelper.createMessage(exchange, producer.getSession(), getEndpoint());

    // TODO just set the correlation id don't get it from the
    // message
    String correlationId;
    if (exchange.getIn().getHeader(JmsConstants.JMS_CORRELATION_ID, String.class) == null) {
        correlationId = UUID.randomUUID().toString().replace("-", "");
    } else {
        correlationId = exchange.getIn().getHeader(JmsConstants.JMS_CORRELATION_ID, String.class);
    }
    Object responseObject = null;
    Exchanger<Object> messageExchanger = new Exchanger<Object>();
    JmsMessageHelper.setCorrelationId(request, correlationId);
    EXCHANGERS.put(correlationId, messageExchanger);

    MessageConsumerResources consumer = consumers.borrowObject();
    JmsMessageHelper.setJMSReplyTo(request, consumer.getReplyToDestination());
    consumers.returnObject(consumer);
    producer.getMessageProducer().send(request);

    // Return the producer to the pool so another waiting producer
    // can move forward
    // without waiting on us to complete the exchange
    try {
        getProducers().returnObject(producer);
    } catch (Exception exception) {
        // thrown if the pool is full. safe to ignore.
    }

    try {
        responseObject = messageExchanger.exchange(null, getResponseTimeOut(), TimeUnit.MILLISECONDS);
        EXCHANGERS.remove(correlationId);
    } catch (InterruptedException e) {
        log.debug("Exchanger was interrupted while waiting on response", e);
        exchange.setException(e);
    } catch (TimeoutException e) {
        log.debug("Exchanger timed out while waiting on response", e);
        exchange.setException(e);
    }

    if (exchange.getException() == null) {
        if (responseObject instanceof Throwable) {
            exchange.setException((Throwable) responseObject);
        } else if (responseObject instanceof Message) {
            Message response = (Message) responseObject;
            JmsMessageHelper.populateExchange(response, exchange, true,
                    getEndpoint().getJmsKeyFormatStrategy());
        } else {
            exchange.setException(new CamelException("Unknown response type: " + responseObject));
        }
    }

    callback.done(isSynchronous());
}

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From source file:org.apache.hadoop.hdfs.server.datanode.TestDirectoryScannerDelta.java

private void setUp(boolean inlineChecksums) {
    LOG.info("setting up!");
    exchanger = new Exchanger<InjectionEventI>();
    InjectionHandler.clear();/*from  w ww  . j  av a  2s. co  m*/
    Configuration CONF = new Configuration();
    CONF.setLong("dfs.block.size", 100);
    CONF.setInt("io.bytes.per.checksum", 1);
    CONF.setLong("dfs.heartbeat.interval", 1L);
    CONF.setInt("dfs.datanode.directoryscan.interval", 1);
    CONF.setBoolean("dfs.use.inline.checksum", inlineChecksums);

    try {
        cluster = new MiniDFSCluster(CONF, 1, true, null);
        cluster.waitActive();

        dn = cluster.getDataNodes().get(0);
        nsid = dn.getAllNamespaces()[0];
        scanner = dn.directoryScanner;
        data = (FSDataset) dn.data;
        Field f = DirectoryScanner.class.getDeclaredField("delta");
        f.setAccessible(true);
        delta = (FSDatasetDelta) f.get(scanner);

        fs = cluster.getFileSystem();
    } catch (Exception e) {
        e.printStackTrace();
        fail("setup failed");
    }
}

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