Package org.glassfish.grizzly.strategies

Class SimpleDynamicNIOStrategy

java.lang.Object

org.glassfish.grizzly.strategies.SimpleDynamicNIOStrategy

All Implemented Interfaces:

IOStrategy, WorkerThreadPoolConfigProducer

public final class SimpleDynamicNIOStrategy
extends java.lang.Object
implements IOStrategy

Simple dynamic strategy, which switches I/O processing strategies, basing on statistics. This implementation takes in consideration number of SelectionKeys, which were selected last time by Selector. SimpleDynamicIOStrategy is able to use 2 strategies underneath: SameThreadIOStrategy, WorkerThreadIOStrategy. And is able to switch between them basing on corresponding threshold (threshold represents the number of selected SelectionKeys). So the strategy is getting applied following way: SameThreadIOStrategy --(worker-thread threshold)--> WorkerThreadIOStrategy.

Author:

Alexey Stashok

Method Summary

Modifier and Type	Method	Description
ThreadPoolConfig	createDefaultWorkerPoolConfig(Transport transport)
boolean	executeIoEvent(Connection connection, IOEvent ioEvent)	The SelectorRunner will invoke this method to allow the strategy implementation to decide how the IOEvent will be handled.
boolean	executeIoEvent(Connection connection, IOEvent ioEvent, boolean isIoEventEnabled)	The SelectorRunner will invoke this method to allow the strategy implementation to decide how the IOEvent will be handled.
static SimpleDynamicNIOStrategy	getInstance()
java.util.concurrent.Executor	getThreadPoolFor(Connection connection, IOEvent ioEvent)	Returns an Executor to be used to run given ioEvent processing for the given connection.

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static SimpleDynamicNIOStrategy getInstance()

executeIoEvent

public boolean executeIoEvent(Connection connection,
                              IOEvent ioEvent)
                       throws java.io.IOException

Description copied from interface: IOStrategy

The SelectorRunner will invoke this method to allow the strategy implementation to decide how the IOEvent will be handled.

Specified by:

executeIoEvent in interface IOStrategy

Parameters:

connection - the Connection upon which the provided IOEvent occurred.

ioEvent - the IOEvent that triggered execution of this strategy

Returns:

true, if this thread should keep processing IOEvents on the current and other Connections, or false if this thread should hand-off the farther IOEvent processing on any Connections, which means IOStrategy is becoming responsible for continuing IOEvent processing (possibly starting new thread, which will handle IOEvents).

Throws:

java.io.IOException - if an error occurs processing the IOEvent.

getThreadPoolFor

public java.util.concurrent.Executor getThreadPoolFor(Connection connection,
                                                      IOEvent ioEvent)

Description copied from interface: IOStrategy

Returns an Executor to be used to run given ioEvent processing for the given connection. A null value will be returned if the ioEvent should be executed in the kernel thread.

Specified by:

getThreadPoolFor in interface IOStrategy

Parameters:

connection - Connection

ioEvent - the event to get the Executor for

Returns:

an Executor to be used to run given ioEvent processing for the given connection

executeIoEvent

public boolean executeIoEvent(Connection connection,
                              IOEvent ioEvent,
                              boolean isIoEventEnabled)
                       throws java.io.IOException

Description copied from interface: IOStrategy

The SelectorRunner will invoke this method to allow the strategy implementation to decide how the IOEvent will be handled.

Specified by:

executeIoEvent in interface IOStrategy

Parameters:

connection - the Connection upon which the provided IOEvent occurred.

ioEvent - the IOEvent that triggered execution of this strategy

isIoEventEnabled - true if IOEvent is still enabled on the Connection, or false if IOEvent was preliminary disabled or IOEvent is being simulated.

Returns:

true, if this thread should keep processing IOEvents on the current and other Connections, or false if this thread should hand-off the farther IOEvent processing on any Connections, which means IOStrategy is becoming responsible for continuing IOEvent processing (possibly starting new thread, which will handle IOEvents).

Throws:

java.io.IOException - if an error occurs processing the IOEvent.

createDefaultWorkerPoolConfig

public ThreadPoolConfig createDefaultWorkerPoolConfig(Transport transport)

Specified by:

createDefaultWorkerPoolConfig in interface WorkerThreadPoolConfigProducer