mondrian.server

Class MonitorImpl

java.lang.Object

mondrian.server.MonitorImpl

All Implemented Interfaces:

Monitor, MonitorMXBean

class MonitorImpl
extends Object
implements Monitor, MonitorMXBean

Process that reads from the monitor stream and updates counters.

Internally, uses a dedicated thread to process events. Events received from log4j are placed on a queue. This "Active object" or "Actor" pattern means that the data structures that hold counters do not need to be locked.

Command requests are treated like events. They place their result on a result queue.

A visitor quickly dispatches events and commands to the appropriate handler method.

The monitored objects form a hierarchy. For each object type, there is a mutable workspace (whose members are private and non-final) that is converted into a monitor object (whose members are public and final) when its fix() method is called:

• MutableServerInfo → ServerInfo
• MutableConnectionInfo → ConnectionInfo
• MutableStatementInfo → StatementInfo
• MutableExecutionInfo → ExecutionInfo
• MutableSqlStatementInfo → SqlStatementInfo

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) static class	MonitorImpl.Command A kind of message that produces a response.
(package private) static interface	MonitorImpl.CommandVisitor<T> Extension to Visitor to allow commands as well as events.
(package private) static class	MonitorImpl.ConnectionsCommand
(package private) static class	MonitorImpl.ServerCommand
(package private) static class	MonitorImpl.ShutdownCommand
(package private) static class	MonitorImpl.SqlStatementsCommand
(package private) static class	MonitorImpl.StatementsCommand

Field Summary

Fields

Modifier and Type	Field and Description
protected static Util.MemoryInfo	MEMORY_INFO

Constructor Summary

Constructors

Constructor and Description
MonitorImpl() Creates a Monitor.

Method Summary

Modifier and Type	Method and Description
List<ConnectionInfo>	getConnections()
ServerInfo	getServer()
List<SqlStatementInfo>	getSqlStatements()
List<StatementInfo>	getStatements()
void	sendEvent(Event event) Sends an event to the monitor.
void	shutdown()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

MEMORY_INFO

protected static final Util.MemoryInfo MEMORY_INFO

Constructor Detail

MonitorImpl

public MonitorImpl()

Creates a Monitor.

Method Detail

shutdown

public void shutdown()

sendEvent

public void sendEvent(Event event)

Description copied from interface: Monitor

Sends an event to the monitor.

Specified by:

sendEvent in interface Monitor

Parameters:

event - Event

getServer

public ServerInfo getServer()

Specified by:

getServer in interface Monitor

Specified by:

getServer in interface MonitorMXBean

getConnections

public List<ConnectionInfo> getConnections()

Specified by:

getConnections in interface Monitor

Specified by:

getConnections in interface MonitorMXBean

getStatements

public List<StatementInfo> getStatements()

Specified by:

getStatements in interface Monitor

Specified by:

getStatements in interface MonitorMXBean

getSqlStatements

public List<SqlStatementInfo> getSqlStatements()

Specified by:

getSqlStatements in interface Monitor

Specified by:

getSqlStatements in interface MonitorMXBean