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use object pools instead of ThreadLocals; closes #197
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commons/core/src/main/java/org/openehealth/ipf/commons/core/DomBuildersPool.java
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| @@ -0,0 +1,135 @@ | ||
| /* | ||
| * Copyright 2018 the original author or authors. | ||
| * | ||
| * 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.openehealth.ipf.commons.core; | ||
|
|
||
| import groovy.lang.Closure; | ||
| import lombok.extern.slf4j.Slf4j; | ||
| import org.vibur.objectpool.ConcurrentPool; | ||
| import org.vibur.objectpool.PoolObjectFactory; | ||
| import org.vibur.objectpool.PoolService; | ||
| import org.vibur.objectpool.util.ConcurrentLinkedQueueCollection; | ||
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|
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| import javax.xml.parsers.DocumentBuilder; | ||
| import javax.xml.parsers.DocumentBuilderFactory; | ||
| import javax.xml.parsers.ParserConfigurationException; | ||
| import java.util.function.Function; | ||
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|
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| /** | ||
| * Pool for DOM document builders (which are not thread-safe). | ||
| * | ||
| * @author Dmytro Rud | ||
| * @since 3.5.1 | ||
| */ | ||
| @Slf4j | ||
| public class DomBuildersPool { | ||
| public static final String POOL_SIZE_PROPERTY = DomBuildersPool.class.getName() + ".POOLSIZE"; | ||
| private static final int DEFAULT_POOL_SIZE = 100; | ||
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|
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| private DomBuildersPool() { | ||
| throw new IllegalStateException("Utility class, not instantiable"); | ||
| } | ||
|
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| private static final PoolService<DocumentBuilder> POOL; | ||
| static { | ||
| int poolSize = Integer.getInteger(POOL_SIZE_PROPERTY, -1); | ||
| POOL = new ConcurrentPool<>(new ConcurrentLinkedQueueCollection<>(), new DocumentBuilderPoolFactory(), | ||
| 0, (poolSize > 0) ? poolSize : DEFAULT_POOL_SIZE, false); | ||
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|
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| } | ||
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| /** | ||
| * Returns a document builder instance. | ||
| */ | ||
| public static DocumentBuilder take() { | ||
| return POOL.take(); | ||
| } | ||
|
|
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| /** | ||
| * Returns a document builder (previously gained via {@link #take()}) to the pool. | ||
| * This method MUST be called as soon as the use of the document builder is finished. | ||
| * | ||
| * @param documentBuilder document builder, <code>null</code> values are safe. | ||
| */ | ||
| public static void restore (DocumentBuilder documentBuilder) { | ||
| if (documentBuilder != null) { | ||
| documentBuilder.reset(); | ||
| POOL.restore(documentBuilder); | ||
| log.debug("Returned document builder {} to the pool", documentBuilder); | ||
| } | ||
| } | ||
|
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| /** | ||
| * Takes a document builder object from the pool, uses it to execute the given operation, | ||
| * and returns it to the pool. | ||
| * | ||
| * @param operation operation to execute using a document builder | ||
| * @param <R> operation return type | ||
| * @return result of the execution of the operation | ||
| */ | ||
| public static <R> R use(Function<DocumentBuilder, R> operation) { | ||
| DocumentBuilder builder = null; | ||
| try { | ||
| builder = take(); | ||
| return operation.apply(builder); | ||
| } finally { | ||
| restore(builder); | ||
| } | ||
| } | ||
|
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| /** | ||
| * Takes a document builder object from the pool, uses it to execute the given Groovy closure, | ||
| * and returns it to the pool. | ||
| * | ||
| * @param closure closure to execute using a document builder | ||
| * @param <R> closure return type | ||
| * @return result of the execution of the closure | ||
| */ | ||
| public static <R> R use(Closure<R> closure) { | ||
| return use(closure::call); | ||
| } | ||
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| private static class DocumentBuilderPoolFactory implements PoolObjectFactory<DocumentBuilder> { | ||
| @Override | ||
| public DocumentBuilder create() { | ||
| try { | ||
| DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); | ||
| factory.setNamespaceAware(true); | ||
| DocumentBuilder documentBuilder = factory.newDocumentBuilder(); | ||
| log.debug("Created a new document builder {}", documentBuilder); | ||
| return documentBuilder; | ||
| } catch (ParserConfigurationException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| @Override | ||
| public boolean readyToTake(DocumentBuilder obj) { | ||
| return true; | ||
| } | ||
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| @Override | ||
| public boolean readyToRestore(DocumentBuilder obj) { | ||
| return true; | ||
| } | ||
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| @Override | ||
| public void destroy(DocumentBuilder obj) { | ||
| // nop | ||
| } | ||
| } | ||
| } |
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