/*

  * Copyright 2006-2011 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.ArrayList;

 import java.util.List;

 import javax.xml.namespace.QName;

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

 import org.apache.commons.lang.StringUtils;

 import org.apache.log4j.Logger;

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

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

 import org.kuali.rice.ksb.api.KsbApiServiceLocator;

 import org.kuali.rice.ksb.api.bus.Endpoint;

 import org.kuali.rice.ksb.api.messaging.AsynchronousCallback;

 import org.kuali.rice.ksb.api.messaging.MessageHelper;

 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, null);

     }

     public Object getServiceAsynchronously(QName qname, String applicationId) {

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

     }

     public Object getServiceAsynchronously(QName qname, AsynchronousCallback callback) {

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

     }

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

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

     }

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

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

     }

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

             List<Endpoint> endpoints = KsbApiServiceLocator.getServiceBus().getEndpoints(qname);

         endpoints = filterEndpointsByApplicationId(endpoints, applicationId);

             if (endpoints.isEmpty()) {

                     throw new RuntimeException("Cannot create service proxy, failed to locate any endpoints with the given service name: " + qname + (applicationId != null ? ", and application id: " + applicationId : ""));

             }

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

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

         }

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

     }

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

             List<Endpoint> endpoints = KsbApiServiceLocator.getServiceBus().getEndpoints(qname);

         endpoints = filterEndpointsByApplicationId(endpoints, applicationId);

             if (endpoints.isEmpty()) {

                     throw new RuntimeException("Cannot create service proxy, failed to locate any endpoints with the given service name: " + qname);

             }

         if (KSBConstants.MESSAGING_SYNCHRONOUS.equals(ConfigContext.getCurrentContextConfig().getProperty(KSBConstants.Config.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(endpoints, null, context, value1, value2);

         }

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

     }

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

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

     }

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

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

     }

     private List<Endpoint> filterEndpointsByApplicationId(List<Endpoint> endpoints, String applicationId) {

         if (StringUtils.isBlank(applicationId)) {

             return endpoints;

         }

         List<Endpoint> filteredEndpoints = new ArrayList<Endpoint>();

         for (Endpoint endpoint : endpoints) {

             if (endpoint.getServiceConfiguration().getApplicationId().equals(applicationId)) {

                 filteredEndpoints.add(endpoint);

             }

         }

         return filteredEndpoints;

     }

 }