org.apache.hadoop.hbase.procedure2

Class AbstractProcedureScheduler

java.lang.Object

org.apache.hadoop.hbase.procedure2.AbstractProcedureScheduler

All Implemented Interfaces:

ProcedureScheduler

Direct Known Subclasses:

MasterProcedureScheduler, SimpleProcedureScheduler

@InterfaceAudience.Private
public abstract class AbstractProcedureScheduler
extends Object
implements ProcedureScheduler

Field Summary

Fields

Modifier and Type	Field and Description
private static org.slf4j.Logger	LOG
private long	nullPollCalls
private long	pollCalls
private boolean	running
private ReentrantLock	schedulerLock
private Condition	schedWaitCond

Constructor Summary

Constructors

Constructor and Description
AbstractProcedureScheduler()

Method Summary

Modifier and Type	Method and Description
void	addBack(Procedure procedure) Inserts the specified element at the end of this queue.
void	addBack(Procedure procedure, boolean notify) Inserts the specified element at the end of this queue.
void	addFront(Iterator<Procedure> procedureIterator) Inserts all elements in the iterator at the front of this queue.
void	addFront(Procedure procedure) Inserts the specified element at the front of this queue.
void	addFront(Procedure procedure, boolean notify) Inserts the specified element at the front of this queue.
protected abstract Procedure	dequeue() Fetch one Procedure from the queue NOTE: this method is called with the sched lock held.
protected abstract void	enqueue(Procedure procedure, boolean addFront) Add the procedure to the queue.
long	getNullPollCalls()
long	getPollCalls()
boolean	hasRunnables()
Procedure	poll() Fetch one Procedure from the queue
Procedure	poll(long nanos)
Procedure	poll(long timeout, TimeUnit unit) Fetch one Procedure from the queue
protected void	push(Procedure procedure, boolean addFront, boolean notify)
protected abstract boolean	queueHasRunnables() Returns true if there are procedures available to process.
protected abstract int	queueSize() Returns the number of elements in this queue.
protected void	schedLock()
protected void	schedUnlock()
void	signalAll() In case the class is blocking on poll() waiting for items to be added, this method should awake poll() and poll() should return.
int	size() Returns the number of elements in this queue.
void	start() Start the scheduler
void	stop() Stop the scheduler
protected void	waitProcedure(LockAndQueue lockAndQueue, Procedure proc)
(package private) void	wakeEvents(ProcedureEvent[] events) Wake up all of the given events.
protected void	wakePollIfNeeded(int waitingCount)
protected void	wakeProcedure(Procedure procedure)
protected int	wakeWaitingProcedures(LockAndQueue lockAndQueue) Wakes up given waiting procedures by pushing them back into scheduler queues.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.hbase.procedure2.ProcedureScheduler

clear, completionCleanup, getLockResource, getLocks, yield

Field Detail

LOG

private static final org.slf4j.Logger LOG

schedulerLock

private final ReentrantLock schedulerLock

schedWaitCond

private final Condition schedWaitCond

running

private boolean running

pollCalls

private long pollCalls

nullPollCalls

private long nullPollCalls

Constructor Detail

AbstractProcedureScheduler

public AbstractProcedureScheduler()

Method Detail

start

public void start()

Description copied from interface: ProcedureScheduler

Start the scheduler

Specified by:

start in interface ProcedureScheduler

stop

public void stop()

Description copied from interface: ProcedureScheduler

Stop the scheduler

Specified by:

stop in interface ProcedureScheduler

signalAll

public void signalAll()

Description copied from interface: ProcedureScheduler

In case the class is blocking on poll() waiting for items to be added, this method should awake poll() and poll() should return.

Specified by:

signalAll in interface ProcedureScheduler

enqueue

protected abstract void enqueue(Procedure procedure,
                                boolean addFront)

Add the procedure to the queue. NOTE: this method is called with the sched lock held.

Parameters:

procedure - the Procedure to add

addFront - true if the item should be added to the front of the queue

addFront

public void addFront(Procedure procedure)

Description copied from interface: ProcedureScheduler

Inserts the specified element at the front of this queue.

Specified by:

addFront in interface ProcedureScheduler

Parameters:

procedure - the Procedure to add

addFront

public void addFront(Procedure procedure,
                     boolean notify)

Description copied from interface: ProcedureScheduler

Inserts the specified element at the front of this queue.

Specified by:

addFront in interface ProcedureScheduler

Parameters:

procedure - the Procedure to add

notify - whether need to notify worker

addFront

public void addFront(Iterator<Procedure> procedureIterator)

Description copied from interface: ProcedureScheduler

Inserts all elements in the iterator at the front of this queue.

Specified by:

addFront in interface ProcedureScheduler

addBack

public void addBack(Procedure procedure)

Description copied from interface: ProcedureScheduler

Inserts the specified element at the end of this queue.

Specified by:

addBack in interface ProcedureScheduler

Parameters:

procedure - the Procedure to add

addBack

public void addBack(Procedure procedure,
                    boolean notify)

Description copied from interface: ProcedureScheduler

Inserts the specified element at the end of this queue.

Specified by:

addBack in interface ProcedureScheduler

Parameters:

procedure - the Procedure to add

notify - whether need to notify worker

push

protected void push(Procedure procedure,
                    boolean addFront,
                    boolean notify)

dequeue

protected abstract Procedure dequeue()

Fetch one Procedure from the queue NOTE: this method is called with the sched lock held.

Returns:

the Procedure to execute, or null if nothing is available.

poll

public Procedure poll()

Description copied from interface: ProcedureScheduler

Fetch one Procedure from the queue

Specified by:

poll in interface ProcedureScheduler

Returns:

the Procedure to execute, or null if nothing present.

poll

public Procedure poll(long timeout,
                      TimeUnit unit)

Description copied from interface: ProcedureScheduler

Fetch one Procedure from the queue

Specified by:

poll in interface ProcedureScheduler

Parameters:

timeout - how long to wait before giving up, in units of unit

unit - a TimeUnit determining how to interpret the timeout parameter

Returns:

the Procedure to execute, or null if nothing present.

poll

public Procedure poll(long nanos)

queueSize

protected abstract int queueSize()

Returns the number of elements in this queue. NOTE: this method is called with the sched lock held.

Returns:

the number of elements in this queue.

queueHasRunnables

protected abstract boolean queueHasRunnables()

Returns true if there are procedures available to process. NOTE: this method is called with the sched lock held.

Returns:

true if there are procedures available to process, otherwise false.

size

public int size()

Description copied from interface: ProcedureScheduler

Returns the number of elements in this queue.

Specified by:

size in interface ProcedureScheduler

Returns:

the number of elements in this queue.

hasRunnables

public boolean hasRunnables()

Specified by:

hasRunnables in interface ProcedureScheduler

Returns:

true if there are procedures available to process, otherwise false.

getPollCalls

public long getPollCalls()

getNullPollCalls

public long getNullPollCalls()

wakeEvents

void wakeEvents(ProcedureEvent[] events)

Wake up all of the given events. Note that we first take scheduler lock and then wakeInternal() synchronizes on the event. Access should remain package-private. Use ProcedureEvent class to wake/suspend events.

Parameters:

events - the list of events to wake

wakeWaitingProcedures

protected int wakeWaitingProcedures(LockAndQueue lockAndQueue)

Wakes up given waiting procedures by pushing them back into scheduler queues.

Returns:

size of given waitQueue.

waitProcedure

protected void waitProcedure(LockAndQueue lockAndQueue,
                             Procedure proc)

wakeProcedure

protected void wakeProcedure(Procedure procedure)

schedLock

protected void schedLock()

schedUnlock

protected void schedUnlock()

wakePollIfNeeded

protected void wakePollIfNeeded(int waitingCount)