Package org.redisson.api

Interface RSemaphoreAsync

All Superinterfaces:

RExpirableAsync, RObjectAsync

All Known Subinterfaces:

RSemaphore

All Known Implementing Classes:

RedissonQueueSemaphore, RedissonSemaphore

public interface RSemaphoreAsync
extends RExpirableAsync

Async interface of Redis based Semaphore.

Works in non-fair mode. Therefore order of acquiring is unpredictable.

Author:

Nikita Koksharov

Method Summary

Modifier and Type	Method	Description
RFuture<Void>	acquireAsync()	Acquires a permit.
RFuture<Void>	acquireAsync(int permits)	Acquires defined amount of permits.
RFuture<Void>	addPermitsAsync(int permits)	Increases or decreases the number of available permits by defined value.
RFuture<Integer>	availablePermitsAsync()	Returns amount of available permits.
RFuture<Integer>	drainPermitsAsync()	Acquires and returns all permits that are immediately available.
RFuture<Void>	releaseAsync()	Releases a permit.
RFuture<Void>	releaseAsync(int permits)	Releases defined amount of permits.
RFuture<Boolean>	tryAcquireAsync()	Acquires a permit.
RFuture<Boolean>	tryAcquireAsync(int permits)	Tries to acquire defined amount of currently available permits.
RFuture<Boolean>	tryAcquireAsync(int permits, long waitTime, TimeUnit unit)	Tries to acquire defined amount of currently available permits.
RFuture<Boolean>	tryAcquireAsync(long waitTime, TimeUnit unit)	Tries to acquire currently available permit.
RFuture<Boolean>	trySetPermitsAsync(int permits)	Tries to set number of permits.

Methods inherited from interface org.redisson.api.RExpirableAsync

clearExpireAsync, expireAsync, expireAsync, expireAsync, expireAtAsync, expireAtAsync, expireIfGreaterAsync, expireIfGreaterAsync, expireIfLessAsync, expireIfLessAsync, expireIfNotSetAsync, expireIfNotSetAsync, expireIfSetAsync, expireIfSetAsync, getExpireTimeAsync, remainTimeToLiveAsync

Methods inherited from interface org.redisson.api.RObjectAsync

addListenerAsync, copyAsync, deleteAsync, dumpAsync, getIdleTimeAsync, isExistsAsync, migrateAsync, moveAsync, removeListenerAsync, renameAsync, renamenxAsync, restoreAndReplaceAsync, restoreAndReplaceAsync, restoreAsync, restoreAsync, sizeInMemoryAsync, touchAsync, unlinkAsync

Method Details

tryAcquireAsync

RFuture<Boolean> tryAcquireAsync()

Acquires a permit. Waits if necessary until a permit became available.

Returns:

true if a permit was acquired and false otherwise

tryAcquireAsync

RFuture<Boolean> tryAcquireAsync(int permits)

Tries to acquire defined amount of currently available permits.

Parameters:

permits - the number of permits to acquire

Returns:

true if permits were acquired and false otherwise

acquireAsync

RFuture<Void> acquireAsync()

Acquires a permit. Waits if necessary until a permit became available.

Returns:

void

acquireAsync

RFuture<Void> acquireAsync(int permits)

Acquires defined amount of permits. Waits if necessary until all permits became available.

Parameters:

permits - the number of permits to acquire

Returns:

void

Throws:

IllegalArgumentException - if permits is negative

releaseAsync

RFuture<Void> releaseAsync()

Releases a permit.

Returns:

void

releaseAsync

RFuture<Void> releaseAsync(int permits)

Releases defined amount of permits.

Parameters:

permits - amount

Returns:

void

trySetPermitsAsync

RFuture<Boolean> trySetPermitsAsync(int permits)

Tries to set number of permits.

Parameters:

permits - - number of permits

Returns:

true if permits has been set successfully, otherwise false.

tryAcquireAsync

RFuture<Boolean> tryAcquireAsync(long waitTime,
 TimeUnit unit)

Tries to acquire currently available permit. Waits up to defined waitTime if necessary until a permit became available.

Parameters:

waitTime - the maximum time to wait

unit - the time unit

Returns:

true if a permit was acquired and false otherwise

tryAcquireAsync

RFuture<Boolean> tryAcquireAsync(int permits,
 long waitTime,
 TimeUnit unit)

Tries to acquire defined amount of currently available permits. Waits up to defined waitTime if necessary until all permits became available.

Parameters:

permits - amount of permits

waitTime - the maximum time to wait

unit - the time unit

Returns:

true if permits were acquired and false otherwise

addPermitsAsync

RFuture<Void> addPermitsAsync(int permits)

Increases or decreases the number of available permits by defined value.

Parameters:

permits - amount of permits to add/remove

availablePermitsAsync

RFuture<Integer> availablePermitsAsync()

Returns amount of available permits.

Returns:

number of permits

drainPermitsAsync

RFuture<Integer> drainPermitsAsync()

Acquires and returns all permits that are immediately available.

Returns:

number of permits