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15.4. Managing the Broker with JMX

Abstract

All of the exposed MBeans have operations that allow you to perform management tasks on the broker. These operations allow you to stop a broker, start and stop network connectors, create and destroy destinations, and create and destroy subscriptions. The MBeans also provide operations for browsing destinations and passing test messages to destinations.

Overview
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The MBeans exposed by Red Hat AMQ provide a number of operations for monitoring and managing a broker instance. You can access these operations through any tool that supports JMX.

Broker actions
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Table 15.5, “Broker MBean Operations” describes the operations exposed by the MBean for a broker.
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Table 15.5. Broker MBean Operations
OperationDescription
void start(); Starts the broker. In reality this operation is not useful because you cannot access the MBeans if the broker is stopped.
void stop(); Forces a broker to shut down. There is no guarantee that all messages will be properly recorded in the persistent store.
void stopGracefully(String queueName); Checks that all listed queues are empty before shutting down the broker.
void enableStatistics(); Activates the broker's statistics plug-in.
void resetStatistics(); Resets the data collected by the statistics plug-in.
void disableStatistics(); Deactivates the broker's statistics plug-in.
String addConnector(String URI); Adds a transport connector to the broker and starts it listening for incoming client connections and returns the name of the connector.
boolean removeConnector(String connectorName); Deactivates the specified transport connector and removes it from the broker.
String addNetworkConnector(String URI); Adds a network connector to the specified broker and returns the name of the connector.
boolean removeNetworkConnector(String connectorName); Deactivates the specified connector and removes it from the broker.
void addTopic(String name); Adds a topic destination to the broker.
void addQueue(String name); Adds a queue destination to the broker.
void removeTopic(String name); Removes the specified topic destination from the broker.
void removeQueue(String name); Removes the specified queue destination from the broker.
ObjectName createDurableSubscriber(String clientId,
                                   String subscriberId,
                                   String topicName,
                                   String selector); 		Creates a new durable subscriber.
void destroyDurableSubscriber(String clientId,
                              String subscriberId); 		Destroys a durable subscriber.
void gc(); Runs the JVM garbage cleaner.
void terminateJVM(int exitCode); Shuts down the JVM.
void reloadLog4jProperties(); Reloads the logging configuration from log4j.properties.

Connector actions
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Table 15.6, “Connector MBean Operations” describes the operations exposed by the MBean for a transport connector.
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Table 15.6. Connector MBean Operations
OperationDescription
void start(); Starts the transport connector so that it is ready to receive connections from clients.
void stop(); Closes the transport connection and disconnects all connected clients.
int connectionCount(); Returns the number of open connections using the connector.
void enableStatistics(); Enables statistics collection for the connector.
void resetStatistics(); Resets the statistics collected for the connector.
void disableStatistics(); Deactivates the collection of statistics for the connector.

Network connector actions
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Table 15.7, “Network Connector MBean Operations” describes the operations exposed by the MBean for a network connector.
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Table 15.7. Network Connector MBean Operations
OperationDescription
void start(); Starts the network connector so that it is ready to communicate with other brokers in a network of brokers.
void stop(); Closes the network connection and disconnects the broker from any brokers that used the network connector to form a network of brokers.

Queue actions
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Table 15.8, “Queue MBean Operations” describes the operations exposed by the MBean for a queue destination.
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Table 15.8. Queue MBean Operations
OperationDescription
CompositeData getMessage(String messageId); Returns the specified message from the queue without moving the message cursor.
void purge(); Deletes all of the messages from the queue.
boolean removeMessage(String messageId); Deletes the specified message from the queue.
int removeMatchingMessages(String selector); Deletes the messages matching the selector from the queue and returns the number of messages deleted.
int removeMatchingMessages(String selector,
                           int maxMessages); 		Deletes up to the maximum number of messages that match the selector and returns the number of messages deleted.
boolean copyMessageTo(String messageId,
                      String destination); 		Copies the specified message to a new destination.
int copyMatchingMessagesTo(String selector,
                           String destination); 		Copies the messages matching the selector and returns the number of messages copied.
int copyMatchingMessagesTo(String selector,
                           String destination,
                           int maxMessages); 		Copies up to the maximum number of messages that match the selector and returns the number of messages copied.
boolean moveMessageTo(String messageId,
                      String destination); 		Moves the specified message to a new destination.
int moveMatchingMessagesTo(String selector,
                           String destination); 		Moves the messages matching the selector and returns the number of messages moved.
int moveMatchingMessagesTo(String selector,
                           String destination,
                           int maxMessages); 		Moves up to the maximum number of messages that match the selector and returns the number of messages moved.
boolean retryMessage(String messageId); Moves the specified message back to its original destination.
int cursorSize(); Returns the number of messages available to be paged in by the cursor.
boolean doesCursorHaveMessagesBuffered(); Returns true if the cursor has buffered messages to be delivered.
boolean doesCursorHaveSpace(); Returns true if the cursor has memory space available.
CompositeData[] browse(); Returns all messages in the queue, without changing the cursor, as an array.
CompositeData[] browse(String selector); Returns all messages in the queue that match the selector, without changing the cursor, as an array.
TabularData browseAsTable(String selector); Returns all messages in the queue that match the selector, without changing the cursor, as a table.
TabularData browseAsTable(); Returns all messages in the queue, without changing the cursor, as a table.
void resetStatistics(); Resets the statistics collected for the queue.
java.util.List browseMessages(String selector); Returns all messages in the queue that match the selector, without changing the cursor, as a list.
java.util.List browseMessages(); Returns all messages in the queue, without changing the cursor, as a list.
String sendTextMessage(String body,
                       String username,
                       String password); 		Send a text message to a secure queue.
String sendTextMessage(String body); Send a text message to a queue.

Topic actions
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Table 15.9, “Topic MBean Operations” describes the operations exposed by the MBean for a topic destination.
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Table 15.9. Topic MBean Operations
OperationDescription
CompositeData[] browse(); Returns all messages in the topic as an array.
CompositeData[] browse(String selector); Returns all messages in the topic that match the selector as an array.
TabularData browseAsTable(String selector); Returns all messages in the topic that match the selector as a table.
TabularData browseAsTable(); Returns all messages in the topic as a table.
void resetStatistics(); Resets the statistics collected for the queue.
java.util.List browseMessages(String selector); Returns all messages in the topic that match the selector as a list.
java.util.List browseMessages(); Returns all messages in the topic as a list.
String sendTextMessage(String body,
                       String username,
                       String password); 		Send a text message to a secure topic.
String sendTextMessage(String body); Send a text message to a topic.

Subscription actions
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Table 15.10, “Subscription MBean Operations” describes the operations exposed by the MBean for a durable subscription.
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Table 15.10. Subscription MBean Operations
OperationDescription
void destroy(); Destroys the subscription.
CompositeData[] browse(); Returns all messages waiting for the subscriber.
TabularData browseAsTable(); Returns all messages waiting for the subscriber.
int cursorSize(); Returns the number of messages available to be paged in by the cursor.
boolean doesCursorHaveMessagesBuffered(); Returns true if the cursor has buffered messages to be delivered.
boolean doesCursorHaveSpace(); Returns true if the cursor has memory space available.
boolean isMatchingQueue(String queueName); Returns true if this subscription matches the given queue name.
boolean isMatchingTopic(String topicName); Returns true if this subscription matches the given topic name.
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