| /** |
| * 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.javaspace; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.File; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.rmi.RemoteException; |
| import java.util.concurrent.ScheduledThreadPoolExecutor; |
| import java.util.concurrent.TimeUnit; |
| |
| import net.jini.core.entry.Entry; |
| import net.jini.core.lease.Lease; |
| import net.jini.core.transaction.CannotAbortException; |
| import net.jini.core.transaction.CannotCommitException; |
| import net.jini.core.transaction.Transaction; |
| import net.jini.core.transaction.UnknownTransactionException; |
| import net.jini.space.JavaSpace; |
| |
| import org.apache.camel.ExchangePattern; |
| import org.apache.camel.Message; |
| import org.apache.camel.Processor; |
| import org.apache.camel.RuntimeCamelException; |
| import org.apache.camel.impl.DefaultConsumer; |
| import org.apache.camel.impl.DefaultExchange; |
| import org.apache.camel.util.ExchangeHelper; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * @{link Consumer} implementation for Javaspaces |
| * |
| * @version |
| */ |
| public class JavaSpaceConsumer extends DefaultConsumer { |
| |
| public static final int READ = 1; |
| public static final int TAKE = 0; |
| |
| @SuppressWarnings("unused") |
| private static final transient Logger LOG = LoggerFactory.getLogger(JavaSpaceConsumer.class); |
| |
| private final int concurrentConsumers; |
| private final boolean transactional; |
| private final long transactionTimeout; |
| private final String verb; |
| private final String templateId; |
| private final ScheduledThreadPoolExecutor executor; |
| private JavaSpace javaSpace; |
| private TransactionHelper transactionHelper; |
| |
| public JavaSpaceConsumer(final JavaSpaceEndpoint endpoint, Processor processor) throws Exception { |
| super(endpoint, processor); |
| this.concurrentConsumers = endpoint.getConcurrentConsumers(); |
| this.transactional = endpoint.isTransactional(); |
| this.transactionTimeout = endpoint.getTransactionTimeout(); |
| this.verb = endpoint.getVerb(); |
| this.templateId = endpoint.getTemplateId(); |
| this.executor = new ScheduledThreadPoolExecutor(this.concurrentConsumers); |
| } |
| |
| protected void doStart() throws Exception { |
| // TODO: There should be a switch to enable/disable using this security hack |
| Utility.setSecurityPolicy("policy.all", "policy_consumer.all"); |
| |
| int verb = TAKE; |
| if (this.verb.equalsIgnoreCase("read")) { |
| verb = READ; |
| } |
| javaSpace = JiniSpaceAccessor.findSpace(((JavaSpaceEndpoint) this.getEndpoint()).getRemaining(), |
| ((JavaSpaceEndpoint) this.getEndpoint()).getSpaceName()); |
| if (transactional) { |
| transactionHelper = TransactionHelper.getInstance(((JavaSpaceEndpoint) this.getEndpoint()).getRemaining()); |
| } |
| for (int i = 0; i < concurrentConsumers; ++i) { |
| Task worker = new Task((JavaSpaceEndpoint) this.getEndpoint(), this.getProcessor(), javaSpace, |
| transactionHelper, transactionTimeout, verb, templateId); |
| executor.scheduleWithFixedDelay(worker, 0, 1, TimeUnit.NANOSECONDS); |
| } |
| |
| (new File("policy_consumer.all")).delete(); |
| } |
| |
| @Override |
| protected void doStop() throws Exception { |
| executor.shutdown(); |
| } |
| |
| } |
| |
| class Task implements Runnable { |
| |
| private final JavaSpaceEndpoint endpoint; |
| private final Processor processor; |
| private final JavaSpace javaSpace; |
| private final TransactionHelper transactionHelper; |
| private final long transactionTimeout; |
| private final int verb; |
| private final Entry template; |
| |
| public Task(JavaSpaceEndpoint endpoint, Processor processor, JavaSpace javaSpace, |
| TransactionHelper transactionHelper, long transactionTimeout, int verb, String templateId) throws Exception { |
| this.endpoint = endpoint; |
| this.processor = processor; |
| this.javaSpace = javaSpace; |
| this.transactionHelper = transactionHelper; |
| this.transactionTimeout = transactionTimeout; |
| this.verb = verb; |
| if (templateId != null) { |
| Entry tmpl = (Entry) this.endpoint.getCamelContext().getRegistry().lookup(templateId); |
| template = javaSpace.snapshot(tmpl); |
| } else { |
| this.template = javaSpace.snapshot(new InEntry()); |
| } |
| } |
| |
| public void run() { |
| Transaction tnx = null; |
| try { |
| DefaultExchange exchange = (DefaultExchange) endpoint.createExchange(ExchangePattern.InOut); |
| Message message = exchange.getIn(); |
| if (transactionHelper != null) { |
| tnx = transactionHelper.getJiniTransaction(transactionTimeout).transaction; |
| } |
| Entry entry = null; |
| switch (verb) { |
| case JavaSpaceConsumer.TAKE: |
| entry = javaSpace.take(template, tnx, 100); |
| break; |
| case JavaSpaceConsumer.READ: |
| entry = javaSpace.read(template, tnx, 100); |
| break; |
| default: |
| throw new RuntimeCamelException("Wrong verb"); |
| } |
| if (entry != null) { |
| if (entry instanceof InEntry) { |
| if (((InEntry) entry).binary) { |
| message.setBody(((InEntry) entry).buffer); |
| } else { |
| ByteArrayInputStream bis = new ByteArrayInputStream(((InEntry) entry).buffer); |
| ObjectInputStream ois = new ObjectInputStream(bis); |
| Object obj = ois.readObject(); |
| message.setBody(obj); |
| } |
| processor.process(exchange); |
| Message out = exchange.getOut(); |
| if (out.getBody() != null && ExchangeHelper.isOutCapable(exchange)) { |
| OutEntry replyCamelEntry = new OutEntry(); |
| replyCamelEntry.correlationId = ((InEntry) entry).correlationId; |
| if (out.getBody() instanceof byte[]) { |
| replyCamelEntry.binary = true; |
| replyCamelEntry.buffer = (byte[]) out.getBody(); |
| } else { |
| ByteArrayOutputStream bos = new ByteArrayOutputStream(); |
| ObjectOutputStream oos = new ObjectOutputStream(bos); |
| oos.writeObject(out.getBody()); |
| replyCamelEntry.binary = false; |
| replyCamelEntry.buffer = bos.toByteArray(); |
| } |
| javaSpace.write(replyCamelEntry, tnx, Lease.FOREVER); |
| } |
| } else { |
| message.setBody(entry, Entry.class); |
| processor.process(exchange); |
| } |
| } |
| |
| } catch (Exception e) { |
| if (tnx != null) { |
| try { |
| tnx.abort(); |
| } catch (UnknownTransactionException e1) { |
| throw new RuntimeCamelException(e1); |
| } catch (CannotAbortException e1) { |
| throw new RuntimeCamelException(e1); |
| } catch (RemoteException e1) { |
| throw new RuntimeCamelException(e1); |
| } |
| } |
| throw new RuntimeCamelException(e); |
| } finally { |
| if (tnx != null) { |
| try { |
| tnx.commit(); |
| } catch (UnknownTransactionException e1) { |
| throw new RuntimeCamelException(e1); |
| } catch (RemoteException e1) { |
| throw new RuntimeCamelException(e1); |
| } catch (CannotCommitException e1) { |
| throw new RuntimeCamelException(e1); |
| } |
| } |
| } |
| } |
| |
| } |