svn commit: r647115 - /servicemix/smx3/trunk/core/servicemix-core/src/main/java/org/apache/servicemix/jbi/resolver/ServiceRoundRobinPolicy.java

[lh...@apache.org]

Author: lhein
Date: Fri Apr 11 04:22:08 2008
New Revision: 647115

URL: http://svn.apache.org/viewvc?rev=647115&view=rev
Log:
new endpoint resolver for Round Robin load balancing

Added:
    servicemix/smx3/trunk/core/servicemix-core/src/main/java/org/apache/servicemix/jbi/resolver/ServiceRoundRobinPolicy.java   (with props)

Added: servicemix/smx3/trunk/core/servicemix-core/src/main/java/org/apache/servicemix/jbi/resolver/ServiceRoundRobinPolicy.java
URL: http://svn.apache.org/viewvc/servicemix/smx3/trunk/core/servicemix-core/src/main/java/org/apache/servicemix/jbi/resolver/ServiceRoundRobinPolicy.java?rev=647115&view=auto
==============================================================================
--- servicemix/smx3/trunk/core/servicemix-core/src/main/java/org/apache/servicemix/jbi/resolver/ServiceRoundRobinPolicy.java (added)
+++ servicemix/smx3/trunk/core/servicemix-core/src/main/java/org/apache/servicemix/jbi/resolver/ServiceRoundRobinPolicy.java Fri Apr 11 04:22:08 2008
@@ -0,0 +1,75 @@
+/*
+ * 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.servicemix.jbi.resolver;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.jbi.component.ComponentContext;
+import javax.jbi.messaging.MessageExchange;
+import javax.jbi.servicedesc.ServiceEndpoint;
+import javax.xml.namespace.QName;
+
+/**
+ * a simple round robin endpoint resolver policy to have a 
+ * basic load balancing
+ * 
+ * @author lhein
+ */
+public class ServiceRoundRobinPolicy implements EndpointChooser {
+
+    private Map<QName, Integer> lastIndexMap = new HashMap<QName, Integer>();
+    private int lastIndex;
+
+    /*
+     * (non-Javadoc)
+     * @see org.apache.servicemix.jbi.resolver.EndpointChooser#chooseEndpoint
+     * (javax.jbi.servicedesc.ServiceEndpoint[], javax.jbi.component.ComponentContext, 
+     * javax.jbi.messaging.MessageExchange)
+     */
+    public ServiceEndpoint chooseEndpoint(ServiceEndpoint[] endpoints, ComponentContext context,
+                                          MessageExchange exchange) {
+        // if there are no endpoints, then just return null
+        if (endpoints.length == 0) {
+            return null;
+        }
+
+        // check for saved index for that service
+        if (lastIndexMap.containsKey(exchange.getService())) {
+            // ok, there is already something
+            lastIndex = lastIndexMap.get(exchange.getService());
+        } else {
+            // fresh value
+            lastIndex = 0;
+        }
+
+        // check if the index needs a reset
+        if (lastIndex >= endpoints.length || lastIndex < 0) {
+            // reset the index
+            lastIndex = 0;
+        }
+
+        // determine the next endpoint to use
+        ServiceEndpoint result = endpoints[lastIndex++];
+
+        // save the index
+        lastIndexMap.put(exchange.getService(), lastIndex);
+
+        // return the endpoint
+        return result;
+    }
+}

Propchange: servicemix/smx3/trunk/core/servicemix-core/src/main/java/org/apache/servicemix/jbi/resolver/ServiceRoundRobinPolicy.java
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