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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

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

Table 15.5, “Broker MBean Operations” describes the operations exposed by the MBean for a broker.
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

Table 15.6, “Connector MBean Operations” describes the operations exposed by the MBean for a transport connector.
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

Table 15.7, “Network Connector MBean Operations” describes the operations exposed by the MBean for a network connector.
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

Table 15.8, “Queue MBean Operations” describes the operations exposed by the MBean for a queue destination.
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

Table 15.9, “Topic MBean Operations” describes the operations exposed by the MBean for a topic destination.
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

Table 15.10, “Subscription MBean Operations” describes the operations exposed by the MBean for a durable subscription.
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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