io.crate.operation

Class ThreadPools

java.lang.Object

io.crate.operation.ThreadPools

public class ThreadPools
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
ThreadPools()

Method Summary

Modifier and Type	Method and Description
static <T> com.google.common.util.concurrent.ListenableFuture<java.util.List<T>>	runWithAvailableThreads(java.util.concurrent.ThreadPoolExecutor executor, int poolSize, java.util.Collection<java.util.concurrent.Callable<T>> callableCollection, com.google.common.base.Function<java.util.List<T>,T> mergeFunction) runs each runnable of the runnableCollection in it's own thread unless there aren't enough threads available.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ThreadPools

public ThreadPools()

Method Detail

runWithAvailableThreads

public static <T> com.google.common.util.concurrent.ListenableFuture<java.util.List<T>> runWithAvailableThreads(java.util.concurrent.ThreadPoolExecutor executor,
                                                                                                                int poolSize,
                                                                                                                java.util.Collection<java.util.concurrent.Callable<T>> callableCollection,
                                                                                                                com.google.common.base.Function<java.util.List<T>,T> mergeFunction)
                                                                                                         throws java.util.concurrent.RejectedExecutionException

runs each runnable of the runnableCollection in it's own thread unless there aren't enough threads available. In that case it will partition the runnableCollection to match the number of available threads.

Type Parameters:

T - type of the final result

Parameters:

executor - executor that is used to execute the callableList

poolSize - the corePoolSize of the given executor

callableCollection - a collection of callable that should be executed

mergeFunction - function that will be applied to merge the results of multiple callable in case that they are executed together if the threadPool is exhausted

Returns:

a future that will return a list of the results of the callableList

Throws:

java.util.concurrent.RejectedExecutionException - in case all threads are busy and overloaded.