Package org.apache.druid.java.util.http.client.pool

Class ResourcePool<K,V>

java.lang.Object

org.apache.druid.java.util.http.client.pool.ResourcePool<K,V>

All Implemented Interfaces:

Closeable, AutoCloseable

public class ResourcePool<K,V>
extends Object
implements Closeable

A resource pool based on LoadingCache. When a resource is first requested for a new key, If the flag: eagerInitialization is true: use ResourcePool.EagerCreationResourceHolder ResourcePoolConfig.getMaxPerKey() resources are initialized and cached in the pool. Else: Initialize a single resource and further lazily using ResourcePool.LazyCreationResourceHolder The individual resource in ResourcePool.ResourceHolderPerKey is valid while (current time - last access time) invalid input: '<'= ResourcePoolConfig.getUnusedConnectionTimeoutMillis(). A resource is closed and reinitialized if ResourceFactory.isGood(V) returns false or it's expired based on ResourcePoolConfig.getUnusedConnectionTimeoutMillis(). invalid input: 'is a hard limit for the max number of resources per cache entry. The total number of resources in {@link ResourceHolderPerKey} cannot be larger than the limit in any case.'

Constructor Summary

Constructors

Constructor	Description
ResourcePool(ResourceFactory<K,V> factory, ResourcePoolConfig config, boolean eagerInitialization)

Method Summary

Modifier and Type	Method	Description
void	close()
ResourceContainer<V>	take(K key)	Returns a ResourceContainer for the given key or null if this pool is already closed.

Methods inherited from class java.lang.Object

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

Constructor Details

ResourcePool

public ResourcePool(ResourceFactory<K,V> factory,
 ResourcePoolConfig config,
 boolean eagerInitialization)

Method Details

take

@Nullable
public ResourceContainer<V> take(K key)

Returns a ResourceContainer for the given key or null if this pool is already closed.

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable