Implements AMQ-5054: Display the number of active transactions and age of oldest transaction on a Connection's JMX info

activemq-broker/src/main/java/org/apache/activemq/broker/Connection.java

@@ -16,13 +16,14 @@
  */
 package org.apache.activemq.broker;
 
-import java.io.IOException;
 import org.apache.activemq.Service;
 import org.apache.activemq.broker.region.ConnectionStatistics;
 import org.apache.activemq.command.Command;
 import org.apache.activemq.command.ConnectionControl;
 import org.apache.activemq.command.Response;
 
+import java.io.IOException;
+
 /**
  * 
  */
@@ -119,4 +120,19 @@ public interface Connection extends Service {
     
     void updateClient(ConnectionControl control);
 
+
+    /**
+     * Returns the number of active transactions established on this Connection.
+     *
+     * @return the number of active transactions established on this Connection..
+     */
+    public int getActiveTransactionCount();
+
+    /**
+     * Returns the number of active transactions established on this Connection.
+     *
+     * @return the number of active transactions established on this Connection..
+     */
+    public Long getOldestActiveTransactionDuration();
+
 }

activemq-broker/src/main/java/org/apache/activemq/broker/TransportConnection.java

@@ -20,12 +20,7 @@ import java.io.EOFException;
 import java.io.IOException;
 import java.net.SocketException;
 import java.net.URI;
-import java.util.HashMap;
+import java.util.*;
-import java.util.Iterator;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.Map;
-import java.util.Properties;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.CountDownLatch;
@@ -379,6 +374,33 @@ public class TransportConnection implements Connection, Task, CommandVisitor {
         return null;
     }
 
+    public int getActiveTransactionCount() {
+        int rc = 0;
+        for (TransportConnectionState cs : connectionStateRegister.listConnectionStates()) {
+            Collection<TransactionState> transactions = cs.getTransactionStates();
+            for (TransactionState transaction : transactions) {
+                rc++;
+            }
+        }
+        return rc;
+    }
+
+    public Long getOldestActiveTransactionDuration() {
+        TransactionState oldestTX = null;
+        for (TransportConnectionState cs : connectionStateRegister.listConnectionStates()) {
+            Collection<TransactionState> transactions = cs.getTransactionStates();
+            for (TransactionState transaction : transactions) {
+                if( oldestTX ==null || oldestTX.getCreatedAt() < transaction.getCreatedAt() ) {
+                    oldestTX = transaction;
+                }
+            }
+        }
+        if( oldestTX == null ) {
+            return null;
+        }
+        return System.currentTimeMillis() - oldestTX.getCreatedAt();
+    }
+
     @Override
     public Response processEndTransaction(TransactionInfo info) throws Exception {
         // No need to do anything. This packet is just sent by the client

activemq-broker/src/main/java/org/apache/activemq/broker/jmx/ConnectionView.java

@@ -166,4 +166,14 @@ public class ConnectionView implements ConnectionViewMBean {
             throw IOExceptionSupport.create(e);
         }
     }
+
+    @Override
+    public int getActiveTransactionCount() {
+        return connection.getActiveTransactionCount();
+    }
+
+    @Override
+    public Long getOldestActiveTransactionDuration() {
+        return connection.getOldestActiveTransactionDuration();
+    }
 }

activemq-broker/src/main/java/org/apache/activemq/broker/jmx/ConnectionViewMBean.java

@@ -19,6 +19,10 @@ package org.apache.activemq.broker.jmx;
 import javax.management.ObjectName;
 
 import org.apache.activemq.Service;
+import org.apache.activemq.broker.TransportConnectionState;
+import org.apache.activemq.state.TransactionState;
+
+import java.util.Collection;
 
 public interface ConnectionViewMBean extends Service {
     /**
@@ -99,4 +103,19 @@ public interface ConnectionViewMBean extends Service {
     @MBeanInfo("The ObjectNames of all Producers created by this Connection")
     ObjectName[] getProducers();
 
+    /**
+     * Returns the number of active transactions established on this Connection.
+     *
+     * @return the number of active transactions established on this Connection..
+     */
+    @MBeanInfo("The number of active transactions established on this Connection.")
+    public int getActiveTransactionCount();
+
+    /**
+     * Returns the number of active transactions established on this Connection.
+     *
+     * @return the number of active transactions established on this Connection..
+     */
+    @MBeanInfo("The age in ms of the oldest active transaction established on this Connection.")
+    public Long getOldestActiveTransactionDuration();
 }

activemq-client/src/main/java/org/apache/activemq/state/TransactionState.java

@@ -34,6 +34,7 @@ public class TransactionState {
     private boolean prepared;
     private int preparedResult;
     private final Map<ProducerId, ProducerState> producers = new ConcurrentHashMap<ProducerId, ProducerState>();
+    private final long createdAt = System.currentTimeMillis();
 
     public TransactionState(TransactionId id) {
         this.id = id;
@@ -92,4 +93,7 @@ public class TransactionState {
         return producers;
     }
 
+    public long getCreatedAt() {
+        return createdAt;
+    }
 }

activemq-unit-tests/src/test/java/org/apache/activemq/broker/region/QueueOptimizedDispatchExceptionTest.java

@@ -197,6 +197,16 @@ public class QueueOptimizedDispatchExceptionTest {
             @Override
             public void dispatchAsync(Command command) {
             }
+
+            @Override
+            public int getActiveTransactionCount() {
+                return 0;
+            }
+
+            @Override
+            public Long getOldestActiveTransactionDuration() {
+                return null;
+            }
         });
 
         final DestinationStatistics destinationStatistics = new DestinationStatistics();