io.github.bucket4j.distributed.proxy.generic.compare_and_swap

Interface AsyncCompareAndSwapOperation

public interface AsyncCompareAndSwapOperation

Describes the set of operations that AbstractCompareAndSwapBasedProxyManager typically performs in reaction to user request. The typical flow is following:

1. getStateData - getStateData(Optional)
2. compareAndSwap - compareAndSwap(byte[], byte[], RemoteBucketState, Optional)
3. Return to first step if CAS was unsuccessful

Method Summary

Modifier and Type	Method and Description
CompletableFuture<Boolean>	compareAndSwap(byte[] originalData, byte[] newData, RemoteBucketState newState, Optional<Long> timeoutNanos) Compares and swap data associated with key
CompletableFuture<Optional<byte[]>>	getStateData(Optional<Long> timeoutNanos) Reads data if it exists

Method Detail

getStateData

CompletableFuture<Optional<byte[]>> getStateData(Optional<Long> timeoutNanos)

Reads data if it exists

Parameters:

timeoutNanos - optional timeout in nanoseconds

Returns:

persisted data or empty optional if data not exists

compareAndSwap

CompletableFuture<Boolean> compareAndSwap(byte[] originalData,
                                          byte[] newData,
                                          RemoteBucketState newState,
                                          Optional<Long> timeoutNanos)

Compares and swap data associated with key

Parameters:

originalData - previous bucket state(can be null).

newData - new bucket state

newState - new state of bucket - can be used to extract additional data is useful for persistence or logging.

timeoutNanos - optional timeout in nanoseconds

Returns:

true if data changed, false if another parallel transaction achieved success instead of current transaction