/*

  * Copyright 2007 The Kuali Foundation

  * 

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  * 

  * 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.kuali.rice.ksb.messaging;

 import java.io.ByteArrayInputStream;

 import java.io.ByteArrayOutputStream;

 import java.io.IOException;

 import java.io.ObjectInputStream;

 import java.io.ObjectOutput;

 import java.io.ObjectOutputStream;

 import java.io.Serializable;

 import java.util.List;

 import javax.xml.namespace.QName;

 import org.apache.commons.codec.binary.Base64;

 import org.apache.log4j.Logger;

 import org.kuali.rice.core.config.ConfigContext;

 import org.kuali.rice.core.exception.RiceRuntimeException;

 import org.kuali.rice.ksb.messaging.resourceloader.KSBResourceLoaderFactory;

 import org.kuali.rice.ksb.messaging.serviceproxies.AsynchronousServiceCallProxy;

 import org.kuali.rice.ksb.messaging.serviceproxies.DelayedAsynchronousServiceCallProxy;

 import org.kuali.rice.ksb.messaging.serviceproxies.SynchronousServiceCallProxy;

 import org.kuali.rice.ksb.util.KSBConstants;

 public class MessageHelperImpl implements MessageHelper {

     private static final Logger LOG = Logger.getLogger(MessageHelperImpl.class);

     public String serializeObject(Serializable object) {

         ByteArrayOutputStream bos = new ByteArrayOutputStream();

         ObjectOutput out = null;

         try {

             out = new ObjectOutputStream(bos);

             out.writeObject(object);

         } catch (IOException e) {

             throw new RiceRuntimeException(e);

         } finally {

             try {

                 out.close();

             } catch (IOException e) {

                 LOG.error("Failed to close ObjectOutputStream", e);

             }

         }

         byte[] buf = bos.toByteArray();

         Base64 b64 = new Base64();

         byte[] encodedObj = b64.encode(buf);

         return new String(encodedObj);

     }

     public Object deserializeObject(String serializedObject) {

         if (serializedObject == null) {

             return serializedObject;

         }

         Base64 b64 = new Base64();

         byte[] result = b64.decode(serializedObject.getBytes());

         Object payload = null;

         ObjectInputStream ois = null;

         try {

             ois = new ObjectInputStream(new ByteArrayInputStream(result));

             payload = ois.readObject();

         } catch (Exception e) {

             // may want to move this loggging up

             LOG.error("Caught Error de-serializing message payload", e);

             // throw new RiceRuntimeException(e);

         } finally {

             try {

                 ois.close();

             } catch (IOException e) {

                 LOG.error("Failed to close de-serialization stream", e);

             }

         }

         return payload;

     }

     public Object getServiceAsynchronously(QName qname) {

         return getAsynchronousServiceCallProxy(qname, null, null, null, null);

     }

     public Object getServiceAsynchronously(QName qname, AsynchronousCallback callback) {

         return getAsynchronousServiceCallProxy(qname, callback, null, null, null);

     }

     public Object getServiceAsynchronously(QName qname, AsynchronousCallback callback, Serializable context) {

         return getAsynchronousServiceCallProxy(qname, callback, context, null, null);

     }

     public Object getServiceAsynchronously(QName qname, AsynchronousCallback callback, Serializable context, String value1, String value2) {

         return getAsynchronousServiceCallProxy(qname, callback, context, value1, value2);

     }

     public Object getAsynchronousServiceCallProxy(QName qname, AsynchronousCallback callback, Serializable context, String value1, String value2) {

         List<RemotedServiceHolder> servicesToProxy = KSBResourceLoaderFactory.getRemoteResourceLocator().getAllServices(qname);

         if (KSBConstants.MESSAGING_SYNCHRONOUS.equals(ConfigContext.getCurrentContextConfig().getProperty(KSBConstants.MESSAGE_DELIVERY))) {

             return SynchronousServiceCallProxy.createInstance(servicesToProxy, callback, context, value1, value2);

         }

         return AsynchronousServiceCallProxy.createInstance(servicesToProxy, callback, context, value1, value2);

     }

     public Object getDelayedAsynchronousServiceCallProxy(QName qname, Serializable context, String value1, String value2, long delayMilliseconds) {

         List<RemotedServiceHolder> servicesToProxy = KSBResourceLoaderFactory.getRemoteResourceLocator().getAllServices(qname);

         if (KSBConstants.MESSAGING_SYNCHRONOUS.equals(ConfigContext.getCurrentContextConfig().getProperty(KSBConstants.MESSAGE_DELIVERY))) {

             LOG.warn("Executing a delayed service call for " + qname + " with delay of " + delayMilliseconds + " in synchronous mode.  Service will be invoked immediately.");

             return SynchronousServiceCallProxy.createInstance(servicesToProxy, null, context, value1, value2);

         }

         return DelayedAsynchronousServiceCallProxy.createInstance(servicesToProxy, context, value1, value2, delayMilliseconds);

     }

     public Object getServiceAsynchronously(QName qname, Serializable context, String value1, String value2, long delayMilliseconds) {

         return getDelayedAsynchronousServiceCallProxy(qname, context, value1, value2, delayMilliseconds);

     }

 }