org.redisson.api

Interface RPermitExpirableSemaphoreAsync

All Superinterfaces:

RExpirableAsync, RObjectAsync

All Known Subinterfaces:

RPermitExpirableSemaphore

All Known Implementing Classes:

RedissonPermitExpirableSemaphore

public interface RPermitExpirableSemaphoreAsync
extends RExpirableAsync

Asynchronous interface for Semaphore object with lease time parameter support for each acquired permit.

Each permit identified by own id and could be released only using its id. Permit id is a 128-bits unique random identifier generated each time during acquiring.

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

Author:

Nikita Koksharov

Method Summary

Modifier and Type	Method and Description
RFuture<String>	acquireAsync() Acquires a permit and returns its id.
RFuture<String>	acquireAsync(long leaseTime, TimeUnit unit) Acquires a permit with defined leaseTime and return its id.
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<Void>	releaseAsync(String permitId) Releases a permit by its id.
RFuture<String>	tryAcquireAsync() Tries to acquire currently available permit and return its id.
RFuture<String>	tryAcquireAsync(long waitTime, long leaseTime, TimeUnit unit) Tries to acquire currently available permit with defined leaseTime and return its id.
RFuture<String>	tryAcquireAsync(long waitTime, TimeUnit unit) Tries to acquire currently available permit and return its id.
RFuture<Boolean>	tryReleaseAsync(String permitId) Tries to release permit by its id.
RFuture<Boolean>	trySetPermitsAsync(int permits) Tries to set number of permits.
RFuture<Boolean>	updateLeaseTimeAsync(String permitId, long leaseTime, TimeUnit unit) Overrides and updates lease time for defined permit id.

Methods inherited from interface org.redisson.api.RExpirableAsync

clearExpireAsync, expireAsync, expireAsync, expireAtAsync, expireAtAsync, 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 Detail

acquireAsync

RFuture<String> acquireAsync()

Acquires a permit and returns its id. Waits if necessary until a permit became available.

Returns:

permit id

acquireAsync

RFuture<String> acquireAsync(long leaseTime,
                             TimeUnit unit)

Acquires a permit with defined leaseTime and return its id. Waits if necessary until a permit became available.

Parameters:

leaseTime - permit lease time

unit - time unit

Returns:

permit id

tryAcquireAsync

RFuture<String> tryAcquireAsync()

Tries to acquire currently available permit and return its id.

Returns:

permit id if a permit was acquired and null otherwise

tryAcquireAsync

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

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

Parameters:

waitTime - the maximum time to wait

unit - the time unit

Returns:

permit id if a permit was acquired and null if the waiting time elapsed before a permit was acquired

tryAcquireAsync

RFuture<String> tryAcquireAsync(long waitTime,
                                long leaseTime,
                                TimeUnit unit)

Tries to acquire currently available permit with defined leaseTime and return its id. Waits up to defined waitTime if necessary until a permit became available.

Parameters:

waitTime - the maximum time to wait

leaseTime - permit lease time, use -1 to make it permanent

unit - the time unit

Returns:

permit id if a permit was acquired and null if the waiting time elapsed before a permit was acquired

tryReleaseAsync

RFuture<Boolean> tryReleaseAsync(String permitId)

Tries to release permit by its id.

Parameters:

permitId - permit id

Returns:

true if a permit has been released and false otherwise

releaseAsync

RFuture<Void> releaseAsync(String permitId)

Releases a permit by its id. Increases the number of available permits. Throws an exception if permit id doesn't exist or has already been released.

Parameters:

permitId - - permit id

Returns:

void

availablePermitsAsync

RFuture<Integer> availablePermitsAsync()

Returns amount of available permits.

Returns:

number of permits

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.

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

Returns:

void

updateLeaseTimeAsync

RFuture<Boolean> updateLeaseTimeAsync(String permitId,
                                      long leaseTime,
                                      TimeUnit unit)

Overrides and updates lease time for defined permit id.

Parameters:

permitId - permit id

leaseTime - permit lease time, use -1 to make it permanent

unit - the time unit

Returns:

true if permits has been updated successfully, otherwise false.