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Camel Javaspace support
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/**
 * 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.server.UID;

import net.jini.core.entry.Entry;
import net.jini.core.lease.Lease;
import net.jini.core.transaction.Transaction;
import net.jini.space.JavaSpace;

import org.apache.camel.Exchange;
import org.apache.camel.Producer;
import org.apache.camel.component.bean.BeanInvocation;
import org.apache.camel.impl.DefaultProducer;
import org.apache.camel.util.ExchangeHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A {@link Producer} implementation for JavaSpaces
 * 
 * @version 
 */
public class JavaSpaceProducer extends DefaultProducer {
    private static final Logger LOG = LoggerFactory.getLogger(JavaSpaceProducer.class);

    private final boolean transactional;
    private final long transactionTimeout;
    private JavaSpace javaSpace;
    private TransactionHelper transactionHelper;

    public JavaSpaceProducer(JavaSpaceEndpoint endpoint) throws Exception {
        super(endpoint);
        this.transactional = endpoint.isTransactional();
        this.transactionTimeout = endpoint.getTransactionTimeout();
    }

    public void process(Exchange exchange) throws Exception {
        Entry entry;
        Object body = exchange.getIn().getBody();

        if (!(body instanceof Entry)) {
            entry = new InEntry();

            if (body instanceof BeanInvocation) {
                ((InEntry) entry).correlationId = (new UID()).toString();
            }

            if (body instanceof byte[]) {
                ((InEntry) entry).binary = true;
                ((InEntry) entry).buffer = (byte[]) body;
            } else {
                ((InEntry) entry).binary = false;
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                ObjectOutputStream oos = new ObjectOutputStream(bos);
                oos.writeObject(body);
                ((InEntry) entry).buffer = bos.toByteArray();
            }
        } else {
            entry = (Entry) body;
        }
 
        Transaction tnx = null;
        if (transactionHelper != null) {
            tnx = transactionHelper.getJiniTransaction(transactionTimeout).transaction;
        }
        if (LOG.isDebugEnabled()) {
            LOG.debug("Writing body : " + entry);
        }
        javaSpace.write(entry, tnx, Lease.FOREVER);

        if (ExchangeHelper.isOutCapable(exchange)) {
            OutEntry tmpl = new OutEntry();
            tmpl.correlationId = ((InEntry)entry).correlationId;

            OutEntry replyCamelEntry = null;
            while (replyCamelEntry == null) {
                replyCamelEntry = (OutEntry)javaSpace.take(tmpl, tnx, 100);
            }

            Object obj;
            if (replyCamelEntry.binary) {
                obj = replyCamelEntry.buffer;
            } else {
                ByteArrayInputStream bis = new ByteArrayInputStream(replyCamelEntry.buffer);
                ObjectInputStream ois = new ObjectInputStream(bis);
                obj = ois.readObject();
            }
            exchange.getOut().setBody(obj);
        }
        if (tnx != null) {
            tnx.commit();
        }
        
    }

    @Override
    protected void doStart() throws Exception {
        // TODO: There should be a switch to enable/disable using this security hack
        Utility.setSecurityPolicy("policy.all", "policy_producer.all");
        javaSpace = JiniSpaceAccessor.findSpace(((JavaSpaceEndpoint) this.getEndpoint()).getUrl(),
                ((JavaSpaceEndpoint) this.getEndpoint()).getSpaceName());
        if (transactional) {
            transactionHelper = TransactionHelper.getInstance(((JavaSpaceEndpoint) this.getEndpoint()).getUrl());
        }
        (new File("policy_producer.all")).delete();
    }

    @Override
    protected void doStop() throws Exception {
    }

}