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From jstrac...@apache.org
Subject svn commit: r382830 - /incubator/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/policy/OldestMessageWithLowestPriorityEvictionStrategy.java
Date Fri, 03 Mar 2006 14:18:35 GMT
Author: jstrachan
Date: Fri Mar  3 06:18:34 2006
New Revision: 382830

URL: http://svn.apache.org/viewcvs?rev=382830&view=rev
Log:
added an alternative eviction strategy

Added:
    incubator/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/policy/OldestMessageWithLowestPriorityEvictionStrategy.java
  (with props)

Added: incubator/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/policy/OldestMessageWithLowestPriorityEvictionStrategy.java
URL: http://svn.apache.org/viewcvs/incubator/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/policy/OldestMessageWithLowestPriorityEvictionStrategy.java?rev=382830&view=auto
==============================================================================
--- incubator/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/policy/OldestMessageWithLowestPriorityEvictionStrategy.java
(added)
+++ incubator/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/policy/OldestMessageWithLowestPriorityEvictionStrategy.java
Fri Mar  3 06:18:34 2006
@@ -0,0 +1,48 @@
+/**
+ *
+ * Copyright 2005-2006 The Apache Software Foundation
+ *
+ * Licensed 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.activemq.broker.region.policy;
+
+import org.apache.activemq.broker.region.MessageReference;
+
+import java.io.IOException;
+import java.util.Iterator;
+import java.util.LinkedList;
+
+/**
+ * An eviction strategy which evicts the oldest message with the lowest priority first.
+ * 
+ * @org.apache.xbean.XBean
+ * 
+ * @version $Revision$messageEvictionStrategy
+ */
+public class OldestMessageWithLowestPriorityEvictionStrategy implements MessageEvictionStrategy
{
+
+    public MessageReference evictMessage(LinkedList messages) throws IOException {
+        byte lowestPriority = Byte.MAX_VALUE;
+        int pivot = 0;
+        Iterator iter = messages.iterator();
+        for (int i = 0; iter.hasNext(); i++) {
+            MessageReference reference = (MessageReference) iter.next();
+            byte priority = reference.getMessage().getPriority();
+            if (priority < lowestPriority) {
+                lowestPriority = priority;
+                pivot = i;
+            }
+        }
+        return (MessageReference) messages.remove(pivot);
+    }
+}

Propchange: incubator/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/policy/OldestMessageWithLowestPriorityEvictionStrategy.java
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Propchange: incubator/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/policy/OldestMessageWithLowestPriorityEvictionStrategy.java
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Propchange: incubator/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/policy/OldestMessageWithLowestPriorityEvictionStrategy.java
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