org.jgroups.util

Class CreditMap

java.lang.Object

org.jgroups.util.CreditMap

public class CreditMap
extends java.lang.Object

Maintains credits for senders, when credits fall below 0, a sender blocks until new credits have been received.

Author:

Bela Ban

Field Summary

Fields

Modifier and Type	Field and Description
protected long	accumulated_credits
protected Average	avg_block_time
protected java.util.Map<Address,java.lang.Long>	credits
protected java.util.concurrent.locks.Condition	credits_available
protected java.util.concurrent.locks.Lock	lock
protected static Log	log
protected long	max_credits
protected long	min_credits
protected int	num_blockings

Constructor Summary

Constructors

Constructor and Description
CreditMap(long max_credits)

Method Summary

Modifier and Type	Method and Description
void	clear()
protected long	computeLowestCredit() Needs to be called with lock held
long	computeLowestCreditWithAccumulated()
protected boolean	decrement(long credits)
boolean	decrement(long credits, long timeout) Decrements credits bytes from all.
protected void	decrementAndAdd(Address member, long new_credits) Decrements credits bytes from all elements and add new_credits to member (if non null).
protected void	flushAccumulatedCredits()
java.lang.Long	get(Address member)
long	getAccumulatedCredits()
double	getAverageBlockTime()
java.util.List<Tuple<Address,java.lang.Long>>	getMembersWithCreditsLessThan(long min_credits)
java.util.List<Address>	getMembersWithInsufficientCredits(long credit_needed)
long	getMinCredits()
int	getNumBlockings()
java.util.Set<Address>	keys()
java.lang.Long	putIfAbsent(Address key)
java.lang.Long	remove(Address key)
void	replenish(Address sender, long new_credits)
void	replenishAll()
void	reset()
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

log

protected static final Log log

max_credits

protected final long max_credits

credits

protected final java.util.Map<Address,java.lang.Long> credits

min_credits

protected long min_credits

accumulated_credits

protected long accumulated_credits

lock

protected final java.util.concurrent.locks.Lock lock

credits_available

protected final java.util.concurrent.locks.Condition credits_available

num_blockings

protected int num_blockings

avg_block_time

protected final Average avg_block_time

Constructor Detail

CreditMap

public CreditMap(long max_credits)

Method Detail

getAccumulatedCredits

public long getAccumulatedCredits()

getMinCredits

public long getMinCredits()

getNumBlockings

public int getNumBlockings()

getAverageBlockTime

public double getAverageBlockTime()

keys

public java.util.Set<Address> keys()

get

public java.lang.Long get(Address member)

remove

public java.lang.Long remove(Address key)

putIfAbsent

public java.lang.Long putIfAbsent(Address key)

getMembersWithInsufficientCredits

public java.util.List<Address> getMembersWithInsufficientCredits(long credit_needed)

getMembersWithCreditsLessThan

public java.util.List<Tuple<Address,java.lang.Long>> getMembersWithCreditsLessThan(long min_credits)

decrement

public boolean decrement(long credits,
                         long timeout)

Decrements credits bytes from all. Returns true if successful, or false if not. Blocks for timeout ms (if greater than 0).

Parameters:

credits - Number of bytes to decrement from all members

timeout - Number of milliseconds to wait until more credits have been received

Returns:

True if decrementing credits bytes succeeded, false otherwise

replenish

public void replenish(Address sender,
                      long new_credits)

replenishAll

public void replenishAll()

clear

public void clear()

reset

public void reset()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

decrement

protected boolean decrement(long credits)

computeLowestCredit

protected long computeLowestCredit()

Needs to be called with lock held

computeLowestCreditWithAccumulated

public long computeLowestCreditWithAccumulated()

decrementAndAdd

protected void decrementAndAdd(Address member,
                               long new_credits)

Decrements credits bytes from all elements and add new_credits to member (if non null). The lowest credit needs to be greater than min_credits. Needs to be called with lock held

Parameters:

member - The member to which new_credits are added. NOP if null

new_credits - Number of bytes to add to member. NOP if 0.

flushAccumulatedCredits

protected void flushAccumulatedCredits()