/**

  * Copyright 2005-2011 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 org.apache.commons.lang.StringUtils;

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

 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;

 import javax.xml.namespace.QName;

 import java.io.Serializable;

 import java.util.ArrayList;

 import java.util.List;

 public class MessageHelperImpl implements MessageHelper {

     @Override

     public <T> T getServiceAsynchronously(QName qname) {

         return (T) getServiceAsynchronously(qname, null, null, null, null, null);

     }

     @Override

     public <T> T getServiceAsynchronously(QName qname, String applicationId) {

         return (T) getServiceAsynchronously(qname, applicationId, null, null, null, null);

     }

     @Override

     public <T> T getServiceAsynchronously(QName qname, AsynchronousCallback callback) {

         return (T) getServiceAsynchronously(qname, null, callback, null, null, null);

     }

     @Override

     public <T> T getServiceAsynchronously(QName qname, AsynchronousCallback callback, Serializable context) {

         return (T) getServiceAsynchronously(qname, null, callback, context, null, null);

     }

     @Override

     public <T> T getServiceAsynchronously(QName qname, AsynchronousCallback callback, Serializable context, String value1, String value2) {

         return (T) getServiceAsynchronously(qname, null, callback, context, value1, value2);

     }

     @Override

     public <T> T getServiceAsynchronously(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 : ""));

             }

         return (T) createProxy(syncMode(), endpoints, callback, context, value1, value2);

     }

     public <T> T 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);

             }

         return (T) createProxyDelayed(syncMode(), endpoints, context, value1, value2, delayMilliseconds);

     }

     @Override

     public <T> T getServiceAsynchronously(QName qname, Serializable context, String value1, String value2, long delayMilliseconds) {

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

     }

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

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

     }

     @Override

     public <T> List<T> getAllRemoteServicesAsynchronously(QName qname) {

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

             if (endpoints.isEmpty()) {

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

             }

         final List<T> proxies = new ArrayList<T>();

         final boolean syncMode = syncMode();

         final String instanceId = KsbApiServiceLocator.getServiceBus().getInstanceId();

         for (Endpoint e : endpoints) {

             if (!e.getServiceConfiguration().getInstanceId().equals(instanceId)) {

                 proxies.add(MessageHelperImpl.<T>createProxy(syncMode, endpoints, null, null, null, null));

             }

         }

         return proxies;

     }

     public static <T> T createProxy(boolean sync, List<Endpoint> endpoints, AsynchronousCallback callback, Serializable context, String value1, String value2) {

         return sync ? (T) SynchronousServiceCallProxy.createInstance(endpoints, callback, context, value1, value2)

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

     }

     public static <T> T createProxyDelayed(boolean sync, List<Endpoint> endpoints,Serializable context, String value1, String value2, long delayMilliseconds) {

         return sync ? (T) SynchronousServiceCallProxy.createInstance(endpoints, null, context, value1, value2)

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

     }

     private static boolean syncMode() {

         return KSBConstants.MESSAGING_SYNCHRONOUS.equals(ConfigContext.getCurrentContextConfig().getProperty(KSBConstants.Config.MESSAGE_DELIVERY));

     }

     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;

     }

 }