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Merge pull request #252 from pontusmelke/1.1-close-conn-on-driver-close
Close all connections on driver.close()
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...er/src/main/java/org/neo4j/driver/internal/net/pooling/BlockingPooledConnectionQueue.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| /** | ||
| * Copyright (c) 2002-2016 "Neo Technology," | ||
| * Network Engine for Objects in Lund AB [http://neotechnology.com] | ||
| * | ||
| * This file is part of Neo4j. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package org.neo4j.driver.internal.net.pooling; | ||
|
|
||
| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.Set; | ||
| import java.util.concurrent.BlockingQueue; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
| import java.util.concurrent.LinkedBlockingQueue; | ||
| import java.util.concurrent.atomic.AtomicBoolean; | ||
|
|
||
| import org.neo4j.driver.internal.util.Supplier; | ||
|
|
||
| /** | ||
| * A blocking queue that also keeps track of connections that are acquired in order | ||
| * to facilitate termination of all connections. | ||
| */ | ||
| public class BlockingPooledConnectionQueue | ||
| { | ||
| /** The backing queue, keeps track of connections currently in queue */ | ||
| private final BlockingQueue<PooledConnection> queue; | ||
|
|
||
| private final AtomicBoolean isTerminating = new AtomicBoolean( false ); | ||
|
|
||
| /** Keeps track of acquired connections */ | ||
| private final Set<PooledConnection> acquiredConnections = | ||
| Collections.newSetFromMap(new ConcurrentHashMap<PooledConnection, Boolean>()); | ||
|
|
||
| public BlockingPooledConnectionQueue( int capacity ) | ||
| { | ||
| this.queue = new LinkedBlockingQueue<>( capacity ); | ||
| } | ||
|
|
||
| /** | ||
| * Offer a connections back to the queue | ||
| * | ||
| * @param pooledConnection the connection to put back to the queue | ||
| * @return <code>true</code> if connections was accepted otherwise <code>false</code> | ||
| */ | ||
| public boolean offer( PooledConnection pooledConnection ) | ||
| { | ||
| acquiredConnections.remove( pooledConnection ); | ||
| boolean offer = queue.offer( pooledConnection ); | ||
| // not added back to the queue, dispose of the connection | ||
| if (!offer) { | ||
| pooledConnection.dispose(); | ||
| } | ||
| if (isTerminating.get()) { | ||
| PooledConnection poll = queue.poll(); | ||
| if (poll != null) | ||
| { | ||
| poll.dispose(); | ||
| } | ||
| } | ||
| return offer; | ||
| } | ||
|
|
||
| /** | ||
| * Acquire connection or create a new one if the queue is empty | ||
| * @param supplier used to create a new connection if queue is empty | ||
| * @return a PooledConnection instance | ||
| */ | ||
| public PooledConnection acquire( Supplier<PooledConnection> supplier ) | ||
| { | ||
|
|
||
| PooledConnection poll = queue.poll(); | ||
| if ( poll == null ) | ||
| { | ||
| poll = supplier.get(); | ||
| } | ||
| acquiredConnections.add( poll ); | ||
|
|
||
| if (isTerminating.get()) { | ||
| acquiredConnections.remove( poll ); | ||
| poll.dispose(); | ||
| throw new IllegalStateException( "Pool has been closed, cannot acquire new values." ); | ||
| } | ||
| return poll; | ||
| } | ||
|
|
||
| public List<PooledConnection> toList() | ||
| { | ||
| return new ArrayList<>( queue ); | ||
| } | ||
|
|
||
| public boolean isEmpty() | ||
| { | ||
| return queue.isEmpty(); | ||
| } | ||
|
|
||
| public int size() | ||
| { | ||
| return queue.size(); | ||
| } | ||
|
|
||
| public boolean contains( PooledConnection pooledConnection ) | ||
| { | ||
| return queue.contains( pooledConnection ); | ||
| } | ||
|
|
||
| /** | ||
| * Terminates all connections, both those that are currently in the queue as well | ||
| * as those that have been acquired. | ||
| */ | ||
| public void terminate() | ||
| { | ||
| if (isTerminating.compareAndSet( false, true )) | ||
| { | ||
| while ( !queue.isEmpty() ) | ||
| { | ||
| PooledConnection conn = queue.poll(); | ||
| if ( conn != null ) | ||
| { | ||
| //close the underlying connection without adding it back to the queue | ||
| conn.dispose(); | ||
| } | ||
| } | ||
| for ( PooledConnection pooledConnection : acquiredConnections ) | ||
| { | ||
| pooledConnection.dispose(); | ||
| } | ||
| } | ||
| } | ||
| } |
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