001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.component.jt400;
018
019 import java.io.IOException;
020
021 import com.ibm.as400.access.AS400;
022 import com.ibm.as400.access.AS400SecurityException;
023 import com.ibm.as400.access.DataQueue;
024 import com.ibm.as400.access.DataQueueEntry;
025 import com.ibm.as400.access.ErrorCompletingRequestException;
026 import com.ibm.as400.access.IllegalObjectTypeException;
027 import com.ibm.as400.access.ObjectDoesNotExistException;
028
029 import org.apache.camel.Exchange;
030 import org.apache.camel.PollingConsumer;
031 import org.apache.camel.RuntimeCamelException;
032 import org.apache.camel.component.jt400.Jt400DataQueueEndpoint.Format;
033 import org.apache.camel.impl.DefaultExchange;
034 import org.apache.camel.impl.PollingConsumerSupport;
035
036
037 /**
038 * {@link PollingConsumer} that polls a data queue for data
039 */
040 public class Jt400DataQueueConsumer extends PollingConsumerSupport {
041
042 private final Jt400DataQueueEndpoint endpoint;
043
044 /**
045 * Creates a new consumer instance
046 */
047 protected Jt400DataQueueConsumer(Jt400DataQueueEndpoint endpoint) {
048 super(endpoint);
049 this.endpoint = endpoint;
050 }
051
052 @Override
053 protected void doStart() throws Exception {
054 if (!endpoint.getSystem().isConnected()) {
055 endpoint.getSystem().connectService(AS400.DATAQUEUE);
056 }
057 }
058
059 @Override
060 protected void doStop() throws Exception {
061 if (endpoint.getSystem().isConnected()) {
062 endpoint.getSystem().disconnectAllServices();
063 }
064 }
065
066 /**
067 * {@link Jt400DataQueueConsumer#receive(long)}
068 */
069 public Exchange receive() {
070 // -1 to indicate a blocking read from data queue
071 return receive(-1);
072 }
073
074 /**
075 * {@link Jt400DataQueueConsumer#receive(long)}
076 */
077 public Exchange receiveNoWait() {
078 return receive(0);
079 }
080
081 /**
082 * Receives an entry from a data queue and returns an {@link Exchange} to
083 * send this data If the endpoint's format is set to {@link Format#binary},
084 * the data queue entry's data will be received/sent as a
085 * <code>byte[]</code>. If the endpoint's format is set to
086 * {@link Format#text}, the data queue entry's data will be received/sent as
087 * a <code>String</code>.
088 *
089 * @param timeout time to wait when reading from data queue. A value of -1
090 * indicates a blocking read.
091 */
092 public Exchange receive(long timeout) {
093 DataQueue queue = endpoint.getDataQueue();
094 try {
095 DataQueueEntry entry;
096 if (timeout >= 0) {
097 entry = queue.read((int)timeout);
098 } else {
099 entry = queue.read();
100 }
101 Exchange exchange = new DefaultExchange(endpoint.getCamelContext());
102 if (entry != null) {
103 if (endpoint.getFormat() == Format.binary) {
104 exchange.getIn().setBody(entry.getData());
105 } else {
106 exchange.getIn().setBody(entry.getString());
107 }
108 return exchange;
109 }
110 } catch (AS400SecurityException e) {
111 throw new RuntimeCamelException("Unable to read from data queue: " + e.getMessage(), e);
112 } catch (ErrorCompletingRequestException e) {
113 throw new RuntimeCamelException("Unable to read from data queue: " + e.getMessage(), e);
114 } catch (IOException e) {
115 throw new RuntimeCamelException("Unable to read from data queue: " + e.getMessage(), e);
116 } catch (IllegalObjectTypeException e) {
117 throw new RuntimeCamelException("Unable to read from data queue: " + e.getMessage(), e);
118 } catch (InterruptedException e) {
119 throw new RuntimeCamelException("Unable to read from data queue: " + e.getMessage(), e);
120 } catch (ObjectDoesNotExistException e) {
121 throw new RuntimeCamelException("Unable to read from data queue: " + e.getMessage(), e);
122 }
123 return null;
124 }
125 }