Package org.apache.hadoop.hdfs.server.datanode.checker

Interface AsyncChecker<K,V>

All Known Implementing Classes:

ThrottledAsyncChecker

@Private
@Unstable
public interface AsyncChecker<K,V>

A class that can be used to schedule an asynchronous check on a given Checkable. If the check is successfully scheduled then a ListenableFuture is returned.

Method Summary

Modifier and Type	Method	Description
java.util.Optional<org.apache.hadoop.thirdparty.com.google.common.util.concurrent.ListenableFuture<V>>	schedule(Checkable<K,V> target, K context)	Schedule an asynchronous check for the given object.
void	shutdownAndWait(long timeout, java.util.concurrent.TimeUnit timeUnit)	Cancel all executing checks and wait for them to complete.

Method Detail

schedule

java.util.Optional<org.apache.hadoop.thirdparty.com.google.common.util.concurrent.ListenableFuture<V>> schedule(Checkable<K,V> target,
                                                                                                                K context)

Schedule an asynchronous check for the given object.

Parameters:

target - object to be checked.

context - the interpretation of the context depends on the target.

Returns:

returns a of ListenableFuture that can be used to retrieve the result of the asynchronous check.

shutdownAndWait

void shutdownAndWait(long timeout,
                     java.util.concurrent.TimeUnit timeUnit)
              throws java.lang.InterruptedException

Cancel all executing checks and wait for them to complete. First attempts a graceful cancellation, then cancels forcefully. Waits for the supplied timeout after both attempts. See ExecutorService.awaitTermination(long, java.util.concurrent.TimeUnit) for a description of the parameters.

Throws:

java.lang.InterruptedException