/**
* 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.camel.component.jt400;
import com.ibm.as400.access.BaseDataQueue;
import com.ibm.as400.access.DataQueue;
import com.ibm.as400.access.DataQueueEntry;
import com.ibm.as400.access.KeyedDataQueue;
import com.ibm.as400.access.KeyedDataQueueEntry;
import org.apache.camel.Exchange;
import org.apache.camel.RuntimeCamelException;
import org.apache.camel.component.jt400.Jt400DataQueueEndpoint.Format;
import org.apache.camel.impl.DefaultExchange;
import org.apache.camel.impl.PollingConsumerSupport;
/**
* {@link org.apache.camel.PollingConsumer} that polls a data queue for data
*/
public class Jt400DataQueueConsumer extends PollingConsumerSupport {
private final Jt400DataQueueEndpoint endpoint;
/**
* Performs the lifecycle logic of this consumer.
*/
private final Jt400DataQueueService queueService;
/**
* Creates a new consumer instance
*/
protected Jt400DataQueueConsumer(Jt400DataQueueEndpoint endpoint) {
super(endpoint);
this.endpoint = endpoint;
this.queueService = new Jt400DataQueueService(endpoint);
}
@Override
protected void doStart() throws Exception {
queueService.start();
}
@Override
protected void doStop() throws Exception {
queueService.stop();
}
public Exchange receive() {
// -1 to indicate a blocking read from data queue
return receive(-1);
}
public Exchange receiveNoWait() {
return receive(0);
}
/**
* Receives an entry from a data queue and returns an {@link Exchange} to
* send this data If the endpoint's format is set to {@link Format#binary},
* the data queue entry's data will be received/sent as a
* <code>byte[]</code>. If the endpoint's format is set to
* {@link Format#text}, the data queue entry's data will be received/sent as
* a <code>String</code>.
* <p/>
* The following message headers may be set by the receiver
* <ul>
* <li>SENDER_INFORMATION: The Sender Information from the Data Queue</li>
* <li>KEY: The message key if the endpoint is configured to connect to a <code>KeyedDataQueue</code></li>
* </ul>
*
* @param timeout time to wait when reading from data queue. A value of -1
* indicates a blocking read.
*/
public Exchange receive(long timeout) {
BaseDataQueue queue = queueService.getDataQueue();
try {
if (endpoint.isKeyed()) {
return receive((KeyedDataQueue) queue, timeout);
} else {
return receive((DataQueue) queue, timeout);
}
} catch (Exception e) {
throw new RuntimeCamelException("Unable to read from data queue: " + queue.getName(), e);
}
}
private Exchange receive(DataQueue queue, long timeout) throws Exception {
DataQueueEntry entry;
if (timeout >= 0) {
int seconds = (int) timeout / 1000;
log.trace("Reading from data queue: {} with {} seconds timeout", queue.getName(), seconds);
entry = queue.read(seconds);
} else {
log.trace("Reading from data queue: {} with no timeout", queue.getName());
entry = queue.read(-1);
}
Exchange exchange = new DefaultExchange(endpoint.getCamelContext());
if (entry != null) {
exchange.getIn().setHeader(Jt400DataQueueEndpoint.SENDER_INFORMATION, entry.getSenderInformation());
if (endpoint.getFormat() == Format.binary) {
exchange.getIn().setBody(entry.getData());
} else {
exchange.getIn().setBody(entry.getString());
}
return exchange;
}
return null;
}
private Exchange receive(KeyedDataQueue queue, long timeout) throws Exception {
String key = endpoint.getSearchKey();
String searchType = endpoint.getSearchType().name();
KeyedDataQueueEntry entry;
if (timeout >= 0) {
int seconds = (int) timeout / 1000;
log.trace("Reading from data queue: {} with {} seconds timeout", queue.getName(), seconds);
entry = queue.read(key, seconds, searchType);
} else {
log.trace("Reading from data queue: {} with no timeout", queue.getName());
entry = queue.read(key, -1, searchType);
}
Exchange exchange = new DefaultExchange(endpoint.getCamelContext());
if (entry != null) {
exchange.getIn().setHeader(Jt400DataQueueEndpoint.SENDER_INFORMATION, entry.getSenderInformation());
if (endpoint.getFormat() == Format.binary) {
exchange.getIn().setBody(entry.getData());
exchange.getIn().setHeader(Jt400DataQueueEndpoint.KEY, entry.getKey());
} else {
exchange.getIn().setBody(entry.getString());
exchange.getIn().setHeader(Jt400DataQueueEndpoint.KEY, entry.getKeyString());
}
return exchange;
}
return null;
}
}