diff options
Diffstat (limited to 'plugins/org.eclipse.wst.common.emf/wtpemf/org/eclipse/wst/common/internal/emf/resource/CacheEventPool.java')
| -rw-r--r-- | plugins/org.eclipse.wst.common.emf/wtpemf/org/eclipse/wst/common/internal/emf/resource/CacheEventPool.java | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/plugins/org.eclipse.wst.common.emf/wtpemf/org/eclipse/wst/common/internal/emf/resource/CacheEventPool.java b/plugins/org.eclipse.wst.common.emf/wtpemf/org/eclipse/wst/common/internal/emf/resource/CacheEventPool.java deleted file mode 100644 index 55799e248..000000000 --- a/plugins/org.eclipse.wst.common.emf/wtpemf/org/eclipse/wst/common/internal/emf/resource/CacheEventPool.java +++ /dev/null @@ -1,149 +0,0 @@ -/******************************************************************************* - * Copyright (c) 2003, 2004 IBM Corporation and others. - * All rights reserved. This program and the accompanying materials - * are made available under the terms of the Eclipse Public License v1.0 - * which accompanies this distribution, and is available at - * http://www.eclipse.org/legal/epl-v10.html - * - * Contributors: - * IBM Corporation - initial API and implementation - *******************************************************************************/ -package org.eclipse.wst.common.internal.emf.resource; - - -import java.util.ArrayList; -import java.util.Collection; - -import org.xml.sax.Attributes; - -/** - * Provides an instance pool of reusable CacheEventNodes. The pool will default to 10 live - * instances. When its available instances reach five times its initial capacity, it will shrink - * itself down to the initial capacity. - * - * @author mdelder - */ -public class CacheEventPool { - - public static final int DEFAULT_CAPACITY = 10; - public static final int DEFAULT_CAPACITY_INCREMENT = 25; - - private int poolCapacity = DEFAULT_CAPACITY; - private CacheEventStack availablePool = null; - private Collection inusePool = null; - - public CacheEventPool() { - this(DEFAULT_CAPACITY); - } - - /** - * Create a CacheEventPOol with the given initial capacity - * - * @param initialCapacity - * The number of available instances to create. - */ - public CacheEventPool(int initialCapacity) { - poolCapacity = (initialCapacity > 0) ? initialCapacity : DEFAULT_CAPACITY; - availablePool = new CacheEventStack(); - inusePool = new ArrayList(poolCapacity); - } - - /** - * Create a CacheEventNode (CENO) initialized to use the given resource as its EMF Owner. - * - * THIS METHOD SHOULD ONLY BE USED TO CREATE ROOT NODES. - * - * @param resource - * the resource that will be populated - * @return a CacheEventNode to serve as the root. - */ - public CacheEventNode createCacheEventNode(TranslatorResource resource) { - CacheEventNode adapter = fetchFreeNode(); - adapter.init(resource); - return adapter; - } - - /** - * Create child CacheEventNodes (CENOs) that will branch from the given parent. - * - * @param parent - * the containing CENO - * @param nodeName - * The value of the XML element node name - * @param attributes - * The attributes that were part of the given XML element - * @return A CENO that has been properly initialized. - */ - public CacheEventNode createCacheEventNode(CacheEventNode parent, String nodeName, Attributes attributes) { - CacheEventNode adapter = fetchFreeNode(); - adapter.init(parent, nodeName, attributes); - return adapter; - } - - /** - * Release the CacheEventNode CENO back to the pool of availabe instances. This method should - * not be invoked directly. CENOs which are acquired from a given pool will automatically - * release themselves when necessary. - * - * @param adapter - */ - public void releaseNode(CacheEventNode adapter) { - freeNode(adapter); - } - - /** - * freezePool() should be invoked to free any unused resources. After freezePool has been - * invoked, warmPool() will need to be invoked before the pool can be used again. - * - */ - public void freezePool() { - availablePool.clear(); - availablePool = null; - } - - /** - * warmPool() must be invoked to notify the pool it is about to be used. This should occur only - * once per document rendering. Until the pool is in use, it contains no available - * CacheEventNodes (CENOs) in order to limit the size of the in-memory footprint of the - * EMF2SAXWriter. - * - */ - public void warmPool() { - ensureMinimumCapacity(); - } - - private CacheEventNode fetchFreeNode() { - CacheEventNode result = null; - - if (availablePool == null || availablePool.isEmpty()) - warmPool(); - - result = availablePool.pop(); - inusePool.add(result); - - return result; - } - - private void freeNode(CacheEventNode adapter) { - if (inusePool.remove(adapter)) - availablePool.push(adapter); - //else - // throw new IllegalStateException("Adapter not contained in pool!"); - if (availablePool.size() > (5 * poolCapacity)) { - availablePool.clear(); - ensureMinimumCapacity(); - } - } - - private void ensureMinimumCapacity() { - if (availablePool == null) { - availablePool = new CacheEventStack(); - } - if (availablePool.size() < poolCapacity) { - final int minimumCapacity = poolCapacity - availablePool.size(); - for (int i = 0; i < minimumCapacity; i++) - availablePool.push(new CacheEventNode(this)); - } - } - -}
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