Package com.coditory.sherlock

Interface DistributedLock

All Known Implementing Classes:

DistributedLockMock

public interface DistributedLock

A distributed lock.

See Also:

• Sherlock

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	DistributedLock.AcquireAndExecuteResult
static class	DistributedLock.ReleaseAndExecuteResult

Method Summary

Modifier and Type	Method	Description
boolean	acquire()	Try to acquire the lock.
boolean	acquire(Duration duration)	Try to acquire the lock for a given duration.
default DistributedLock.AcquireAndExecuteResult	acquireAndExecute(Runnable action)	Acquire a lock and release it after action is executed.
default DistributedLock.AcquireAndExecuteResult	acquireAndExecute(Duration duration, Runnable action)	Acquire a lock for specific duration and release it after action is executed.
boolean	acquireForever()	Try to acquire the lock without expiring date.
default DistributedLock.AcquireAndExecuteResult	acquireForeverAndExecute(Runnable action)	Acquire a lock for specific duration and release it after action is executed.
String	getId()	Return the lock id.
boolean	release()	Try to release the lock.
default DistributedLock.ReleaseAndExecuteResult	releaseAndExecute(Runnable action)	Run the action if lock is released.

Method Details

getId

String getId()

Return the lock id.

Returns:

the lock id

acquire

boolean acquire()

Try to acquire the lock. Lock is acquired for a pre configured duration.

Returns:

true if lock is acquired

acquire

boolean acquire(Duration duration)

Try to acquire the lock for a given duration.

Parameters:

duration - how much time must pass for the acquired lock to expire

Returns:

true if lock is acquired

acquireForever

boolean acquireForever()

Try to acquire the lock without expiring date.

It is potentially dangerous. Lookout for a situation when the lock owning instance goes down with out releasing the lock.

Returns:

true if lock is acquired

release

boolean release()

Try to release the lock.

Returns:

true if lock was released by this method invocation. If lock has expired or was released earlier then false is returned.

acquireAndExecute

default DistributedLock.AcquireAndExecuteResult acquireAndExecute(Runnable action)

Acquire a lock and release it after action is executed.

This is a helper method that makes sure the lock is released when action finishes successfully or throws an exception.

Parameters:

action - to be executed when lock is acquired

Returns:

DistributedLock.AcquireAndExecuteResult

See Also:

• acquire()

acquireAndExecute

default DistributedLock.AcquireAndExecuteResult acquireAndExecute(Duration duration,
 Runnable action)

Acquire a lock for specific duration and release it after action is executed.

This is a helper method that makes sure the lock is released when action finishes successfully or throws an exception.

Parameters:

duration - how much time must pass to release the lock

action - to be executed when lock is acquired

Returns:

DistributedLock.AcquireAndExecuteResult

See Also:

• acquire(Duration)

acquireForeverAndExecute

default DistributedLock.AcquireAndExecuteResult acquireForeverAndExecute(Runnable action)

Acquire a lock for specific duration and release it after action is executed.

This is a helper method that makes sure the lock is released when action finishes successfully or throws an exception.

Parameters:

action - to be executed when lock is acquired

Returns:

DistributedLock.AcquireAndExecuteResult

See Also:

• acquireForever()

releaseAndExecute

default DistributedLock.ReleaseAndExecuteResult releaseAndExecute(Runnable action)

Run the action if lock is released.

Parameters:

action - to be executed when lock is released

Returns:

DistributedLock.ReleaseAndExecuteResult

See Also:

• release()