QPID-1224: add methods to get the list of message ids from a queue, with optional offset. Test class for this.

git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk@683932 13f79535-47bb-0310-9956-ffa450edef68

2 files changed, 26 insertions, 0 deletions

diff --git a/qpid/java/broker/src/main/java/org/apache/qpid/server/queue/AMQQueue.java b/qpid/java/broker/src/main/java/org/apache/qpid/server/queue/AMQQueue.java
index f7bc2ddafa..c9c252f06d 100644
--- a/qpid/java/broker/src/main/java/org/apache/qpid/server/queue/AMQQueue.java
+++ b/qpid/java/broker/src/main/java/org/apache/qpid/server/queue/AMQQueue.java
@@ -104,6 +104,10 @@ public interface AMQQueue extends Managable, Comparable<AMQQueue>
 
     List<QueueEntry> getMessagesOnTheQueue(long fromMessageId, long toMessageId);
 
+    List<Long> getMessagesOnTheQueue(int num);
+
+    List<Long> getMessagesOnTheQueue(int num, int offest);
+
     QueueEntry getMessageOnTheQueue(long messageId);
 
 
diff --git a/qpid/java/broker/src/main/java/org/apache/qpid/server/queue/SimpleAMQQueue.java b/qpid/java/broker/src/main/java/org/apache/qpid/server/queue/SimpleAMQQueue.java
index 1674c26232..b0f700d4a1 100644
--- a/qpid/java/broker/src/main/java/org/apache/qpid/server/queue/SimpleAMQQueue.java
+++ b/qpid/java/broker/src/main/java/org/apache/qpid/server/queue/SimpleAMQQueue.java
@@ -1613,4 +1613,26 @@ public class SimpleAMQQueue implements AMQQueue, Subscription.StateListener
             deliverAsync(_sub);
         }
     }
+
+    public List<Long> getMessagesOnTheQueue(int num)
+    {
+        return getMessagesOnTheQueue(num, 0);
+    }
+
+    public List<Long> getMessagesOnTheQueue(int num, int offset)
+    {
+        ArrayList<Long> ids = new ArrayList<Long>(num);
+        QueueEntryIterator it = _entries.iterator();
+        for (int i = 0; i < offset; i++)
+        {
+            it.advance();
+        }
+
+        for (int i = 0; i < num && !it.atTail(); i++)
+        {
+            it.advance();
+            ids.add(it.getNode().getMessage().getMessageId());
+        }
+        return ids;
+    }
 }
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