org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/JavaModelCache.java - aspectj/org.aspectj.shadows - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2006 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.jdt.internal.core;
 import java.util.HashMap;
 import java.util.Map;

 import org.eclipse.jdt.core.IJavaElement;
 import org.eclipse.jdt.internal.core.util.LRUCache;

 /**
  * The cache of java elements to their respective info.
  */
 public class JavaModelCache {
 	public static boolean VERBOSE = false;

 	public static final int DEFAULT_PROJECT_SIZE = 5;  // average 25552 bytes per project.
 	public static final int DEFAULT_ROOT_SIZE = 50; // average 2590 bytes per root -> maximum size : 25900*BASE_VALUE bytes
 	public static final int DEFAULT_PKG_SIZE = 500; // average 1782 bytes per pkg -> maximum size : 178200*BASE_VALUE bytes
 	public static final int DEFAULT_OPENABLE_SIZE = 500; // average 6629 bytes per openable (includes children) -> maximum size : 662900*BASE_VALUE bytes
 	public static final int DEFAULT_CHILDREN_SIZE = 500*20; // average 20 children per openable

 	public static final Object NON_EXISTING_JAR_TYPE_INFO = new Object();

 	/*
 	 * The memory ratio that should be applied to the above constants.
 	 */
 	protected double memoryRatio = -1;

 	/**
 	 * Active Java Model Info
 	 */
 	protected JavaModelInfo modelInfo;

 	/**
 	 * Cache of open projects.
 	 */
 	protected HashMap projectCache;

 	/**
 	 * Cache of open package fragment roots.
 	 */
 	protected ElementCache rootCache;

 	/**
 	 * Cache of open package fragments
 	 */
 	protected ElementCache pkgCache;

 	/**
 	 * Cache of open compilation unit and class files
 	 */
 	protected ElementCache openableCache;

 	/**
 	 * Cache of open children of openable Java Model Java elements
 	 */
 	protected Map childrenCache;

 	/*
 	 * Cache of open binary type (inside a jar) that have a non-open parent
 	 */
 	protected LRUCache jarTypeCache;

 public JavaModelCache() {
 	// set the size of the caches in function of the maximum amount of memory available
 	double ratio = getMemoryRatio();
 	this.projectCache = new HashMap(DEFAULT_PROJECT_SIZE); // NB: Don't use a LRUCache for projects as they are constantly reopened (e.g. during delta processing)
 	if (VERBOSE) {
 		this.rootCache = new VerboseElementCache((int) (DEFAULT_ROOT_SIZE * ratio), "Root cache"); //$NON-NLS-1$
 		this.pkgCache = new VerboseElementCache((int) (DEFAULT_PKG_SIZE * ratio), "Package cache"); //$NON-NLS-1$
 		this.openableCache = new VerboseElementCache((int) (DEFAULT_OPENABLE_SIZE * ratio), "Openable cache"); //$NON-NLS-1$
 	} else {
 		this.rootCache = new ElementCache((int) (DEFAULT_ROOT_SIZE * ratio));
 		this.pkgCache = new ElementCache((int) (DEFAULT_PKG_SIZE * ratio));
 		this.openableCache = new ElementCache((int) (DEFAULT_OPENABLE_SIZE * ratio));
 	}
 	this.childrenCache = new HashMap((int) (DEFAULT_CHILDREN_SIZE * ratio));
 	resetJarTypeCache();
 }

 /**
  *  Returns the info for the element.
  */
 public Object getInfo(IJavaElement element) {
 	switch (element.getElementType()) {
 		case IJavaElement.JAVA_MODEL:
 			return this.modelInfo;
 		case IJavaElement.JAVA_PROJECT:
 			return this.projectCache.get(element);
 		case IJavaElement.PACKAGE_FRAGMENT_ROOT:
 			return this.rootCache.get(element);
 		case IJavaElement.PACKAGE_FRAGMENT:
 			return this.pkgCache.get(element);
 		case IJavaElement.COMPILATION_UNIT:
 		case IJavaElement.CLASS_FILE:
 			return this.openableCache.get(element);
 		case IJavaElement.TYPE:
 			Object result = this.jarTypeCache.get(element);
 			if (result != null)
 				return result;
 			else
 				return this.childrenCache.get(element);
 		default:
 			return this.childrenCache.get(element);
 	}
 }

 protected double getMemoryRatio() {
 	if (this.memoryRatio == -1) {
 		long maxMemory = Runtime.getRuntime().maxMemory();
 		// if max memory is infinite, set the ratio to 4d which corresponds to the 256MB that Eclipse defaults to
 		// (see https://bugs.eclipse.org/bugs/show_bug.cgi?id=111299)
 		this.memoryRatio = maxMemory == Long.MAX_VALUE ? 4d : ((double) maxMemory) / (64 * 0x100000); // 64MB is the base memory for most JVM
 	}
 	return this.memoryRatio;
 }

 /**
  *  Returns the info for this element without
  *  disturbing the cache ordering.
  */
 protected Object peekAtInfo(IJavaElement element) {
 	switch (element.getElementType()) {
 		case IJavaElement.JAVA_MODEL:
 			return this.modelInfo;
 		case IJavaElement.JAVA_PROJECT:
 			return this.projectCache.get(element);
 		case IJavaElement.PACKAGE_FRAGMENT_ROOT:
 			return this.rootCache.peek(element);
 		case IJavaElement.PACKAGE_FRAGMENT:
 			return this.pkgCache.peek(element);
 		case IJavaElement.COMPILATION_UNIT:
 		case IJavaElement.CLASS_FILE:
 			return this.openableCache.peek(element);
 		case IJavaElement.TYPE:
 			Object result = this.jarTypeCache.peek(element);
 			if (result != null)
 				return result;
 			else
 				return this.childrenCache.get(element);
 		default:
 			return this.childrenCache.get(element);
 	}
 }

 /**
  * Remember the info for the element.
  */
 protected void putInfo(IJavaElement element, Object info) {
 	switch (element.getElementType()) {
 		case IJavaElement.JAVA_MODEL:
 			this.modelInfo = (JavaModelInfo) info;
 			break;
 		case IJavaElement.JAVA_PROJECT:
 			this.projectCache.put(element, info);
 			this.rootCache.ensureSpaceLimit(((JavaElementInfo) info).children.length, element);
 			break;
 		case IJavaElement.PACKAGE_FRAGMENT_ROOT:
 			this.rootCache.put(element, info);
 			this.pkgCache.ensureSpaceLimit(((JavaElementInfo) info).children.length, element);
 			break;
 		case IJavaElement.PACKAGE_FRAGMENT:
 			this.pkgCache.put(element, info);
 			this.openableCache.ensureSpaceLimit(((JavaElementInfo) info).children.length, element);
 			break;
 		case IJavaElement.COMPILATION_UNIT:
 		case IJavaElement.CLASS_FILE:
 			this.openableCache.put(element, info);
 			break;
 		default:
 			this.childrenCache.put(element, info);
 	}
 }
 /**
  * Removes the info of the element from the cache.
  */
 protected void removeInfo(JavaElement element) {
 	switch (element.getElementType()) {
 		case IJavaElement.JAVA_MODEL:
 			this.modelInfo = null;
 			break;
 		case IJavaElement.JAVA_PROJECT:
 			this.projectCache.remove(element);
 			this.rootCache.resetSpaceLimit((int) (DEFAULT_ROOT_SIZE * getMemoryRatio()), element);
 			break;
 		case IJavaElement.PACKAGE_FRAGMENT_ROOT:
 			this.rootCache.remove(element);
 			this.pkgCache.resetSpaceLimit((int) (DEFAULT_PKG_SIZE * getMemoryRatio()), element);
 			break;
 		case IJavaElement.PACKAGE_FRAGMENT:
 			this.pkgCache.remove(element);
 			this.openableCache.resetSpaceLimit((int) (DEFAULT_OPENABLE_SIZE * getMemoryRatio()), element);
 			break;
 		case IJavaElement.COMPILATION_UNIT:
 		case IJavaElement.CLASS_FILE:
 			this.openableCache.remove(element);
 			break;
 		default:
 			this.childrenCache.remove(element);
 	}
 }
 protected void resetJarTypeCache() {
 	this.jarTypeCache = new LRUCache((int) (DEFAULT_OPENABLE_SIZE * getMemoryRatio()));
 }
 public String toString() {
 	return toStringFillingRation(""); //$NON-NLS-1$
 }
 public String toStringFillingRation(String prefix) {
 	StringBuffer buffer = new StringBuffer();
 	buffer.append(prefix);
 	buffer.append("Project cache: "); //$NON-NLS-1$
 	buffer.append(this.projectCache.size());
 	buffer.append(" projects\n"); //$NON-NLS-1$
 	buffer.append(prefix);
 	buffer.append(this.rootCache.toStringFillingRation("Root cache")); //$NON-NLS-1$
 	buffer.append('\n');
 	buffer.append(prefix);
 	buffer.append(this.pkgCache.toStringFillingRation("Package cache")); //$NON-NLS-1$
 	buffer.append('\n');
 	buffer.append(prefix);
 	buffer.append(this.openableCache.toStringFillingRation("Openable cache")); //$NON-NLS-1$
 	buffer.append('\n');
 	buffer.append(prefix);
 	buffer.append(this.jarTypeCache.toStringFillingRation("Jar type cache")); //$NON-NLS-1$
 	buffer.append('\n');
 	return buffer.toString();
 }
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2006 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.jdt.internal.core;
	import java.util.HashMap;
	import java.util.Map;

	import org.eclipse.jdt.core.IJavaElement;
	import org.eclipse.jdt.internal.core.util.LRUCache;

	/**
	* The cache of java elements to their respective info.
	*/
	public class JavaModelCache {
	public static boolean VERBOSE = false;

	public static final int DEFAULT_PROJECT_SIZE = 5; // average 25552 bytes per project.
	public static final int DEFAULT_ROOT_SIZE = 50; // average 2590 bytes per root -> maximum size : 25900*BASE_VALUE bytes
	public static final int DEFAULT_PKG_SIZE = 500; // average 1782 bytes per pkg -> maximum size : 178200*BASE_VALUE bytes
	public static final int DEFAULT_OPENABLE_SIZE = 500; // average 6629 bytes per openable (includes children) -> maximum size : 662900*BASE_VALUE bytes
	public static final int DEFAULT_CHILDREN_SIZE = 500*20; // average 20 children per openable

	public static final Object NON_EXISTING_JAR_TYPE_INFO = new Object();

	/*
	* The memory ratio that should be applied to the above constants.
	*/
	protected double memoryRatio = -1;

	/**
	* Active Java Model Info
	*/
	protected JavaModelInfo modelInfo;

	/**
	* Cache of open projects.
	*/
	protected HashMap projectCache;

	/**
	* Cache of open package fragment roots.
	*/
	protected ElementCache rootCache;

	/**
	* Cache of open package fragments
	*/
	protected ElementCache pkgCache;

	/**
	* Cache of open compilation unit and class files
	*/
	protected ElementCache openableCache;

	/**
	* Cache of open children of openable Java Model Java elements
	*/
	protected Map childrenCache;

	/*
	* Cache of open binary type (inside a jar) that have a non-open parent
	*/
	protected LRUCache jarTypeCache;

	public JavaModelCache() {
	// set the size of the caches in function of the maximum amount of memory available
	double ratio = getMemoryRatio();
	this.projectCache = new HashMap(DEFAULT_PROJECT_SIZE); // NB: Don't use a LRUCache for projects as they are constantly reopened (e.g. during delta processing)
	if (VERBOSE) {
	this.rootCache = new VerboseElementCache((int) (DEFAULT_ROOT_SIZE * ratio), "Root cache"); //$NON-NLS-1$
	this.pkgCache = new VerboseElementCache((int) (DEFAULT_PKG_SIZE * ratio), "Package cache"); //$NON-NLS-1$
	this.openableCache = new VerboseElementCache((int) (DEFAULT_OPENABLE_SIZE * ratio), "Openable cache"); //$NON-NLS-1$
	} else {
	this.rootCache = new ElementCache((int) (DEFAULT_ROOT_SIZE * ratio));
	this.pkgCache = new ElementCache((int) (DEFAULT_PKG_SIZE * ratio));
	this.openableCache = new ElementCache((int) (DEFAULT_OPENABLE_SIZE * ratio));
	}
	this.childrenCache = new HashMap((int) (DEFAULT_CHILDREN_SIZE * ratio));
	resetJarTypeCache();
	}

	/**
	* Returns the info for the element.
	*/
	public Object getInfo(IJavaElement element) {
	switch (element.getElementType()) {
	case IJavaElement.JAVA_MODEL:
	return this.modelInfo;
	case IJavaElement.JAVA_PROJECT:
	return this.projectCache.get(element);
	case IJavaElement.PACKAGE_FRAGMENT_ROOT:
	return this.rootCache.get(element);
	case IJavaElement.PACKAGE_FRAGMENT:
	return this.pkgCache.get(element);
	case IJavaElement.COMPILATION_UNIT:
	case IJavaElement.CLASS_FILE:
	return this.openableCache.get(element);
	case IJavaElement.TYPE:
	Object result = this.jarTypeCache.get(element);
	if (result != null)
	return result;
	else
	return this.childrenCache.get(element);
	default:
	return this.childrenCache.get(element);
	}
	}

	protected double getMemoryRatio() {
	if (this.memoryRatio == -1) {
	long maxMemory = Runtime.getRuntime().maxMemory();
	// if max memory is infinite, set the ratio to 4d which corresponds to the 256MB that Eclipse defaults to
	// (see https://bugs.eclipse.org/bugs/show_bug.cgi?id=111299)
	this.memoryRatio = maxMemory == Long.MAX_VALUE ? 4d : ((double) maxMemory) / (64 * 0x100000); // 64MB is the base memory for most JVM
	}
	return this.memoryRatio;
	}

	/**
	* Returns the info for this element without
	* disturbing the cache ordering.
	*/
	protected Object peekAtInfo(IJavaElement element) {
	switch (element.getElementType()) {
	case IJavaElement.JAVA_MODEL:
	return this.modelInfo;
	case IJavaElement.JAVA_PROJECT:
	return this.projectCache.get(element);
	case IJavaElement.PACKAGE_FRAGMENT_ROOT:
	return this.rootCache.peek(element);
	case IJavaElement.PACKAGE_FRAGMENT:
	return this.pkgCache.peek(element);
	case IJavaElement.COMPILATION_UNIT:
	case IJavaElement.CLASS_FILE:
	return this.openableCache.peek(element);
	case IJavaElement.TYPE:
	Object result = this.jarTypeCache.peek(element);
	if (result != null)
	return result;
	else
	return this.childrenCache.get(element);
	default:
	return this.childrenCache.get(element);
	}
	}

	/**
	* Remember the info for the element.
	*/
	protected void putInfo(IJavaElement element, Object info) {
	switch (element.getElementType()) {
	case IJavaElement.JAVA_MODEL:
	this.modelInfo = (JavaModelInfo) info;
	break;
	case IJavaElement.JAVA_PROJECT:
	this.projectCache.put(element, info);
	this.rootCache.ensureSpaceLimit(((JavaElementInfo) info).children.length, element);
	break;
	case IJavaElement.PACKAGE_FRAGMENT_ROOT:
	this.rootCache.put(element, info);
	this.pkgCache.ensureSpaceLimit(((JavaElementInfo) info).children.length, element);
	break;
	case IJavaElement.PACKAGE_FRAGMENT:
	this.pkgCache.put(element, info);
	this.openableCache.ensureSpaceLimit(((JavaElementInfo) info).children.length, element);
	break;
	case IJavaElement.COMPILATION_UNIT:
	case IJavaElement.CLASS_FILE:
	this.openableCache.put(element, info);
	break;
	default:
	this.childrenCache.put(element, info);
	}
	}
	/**
	* Removes the info of the element from the cache.
	*/
	protected void removeInfo(JavaElement element) {
	switch (element.getElementType()) {
	case IJavaElement.JAVA_MODEL:
	this.modelInfo = null;
	break;
	case IJavaElement.JAVA_PROJECT:
	this.projectCache.remove(element);
	this.rootCache.resetSpaceLimit((int) (DEFAULT_ROOT_SIZE * getMemoryRatio()), element);
	break;
	case IJavaElement.PACKAGE_FRAGMENT_ROOT:
	this.rootCache.remove(element);
	this.pkgCache.resetSpaceLimit((int) (DEFAULT_PKG_SIZE * getMemoryRatio()), element);
	break;
	case IJavaElement.PACKAGE_FRAGMENT:
	this.pkgCache.remove(element);
	this.openableCache.resetSpaceLimit((int) (DEFAULT_OPENABLE_SIZE * getMemoryRatio()), element);
	break;
	case IJavaElement.COMPILATION_UNIT:
	case IJavaElement.CLASS_FILE:
	this.openableCache.remove(element);
	break;
	default:
	this.childrenCache.remove(element);
	}
	}
	protected void resetJarTypeCache() {
	this.jarTypeCache = new LRUCache((int) (DEFAULT_OPENABLE_SIZE * getMemoryRatio()));
	}
	public String toString() {
	return toStringFillingRation(""); //$NON-NLS-1$
	}
	public String toStringFillingRation(String prefix) {
	StringBuffer buffer = new StringBuffer();
	buffer.append(prefix);
	buffer.append("Project cache: "); //$NON-NLS-1$
	buffer.append(this.projectCache.size());
	buffer.append(" projects\n"); //$NON-NLS-1$
	buffer.append(prefix);
	buffer.append(this.rootCache.toStringFillingRation("Root cache")); //$NON-NLS-1$
	buffer.append('\n');
	buffer.append(prefix);
	buffer.append(this.pkgCache.toStringFillingRation("Package cache")); //$NON-NLS-1$
	buffer.append('\n');
	buffer.append(prefix);
	buffer.append(this.openableCache.toStringFillingRation("Openable cache")); //$NON-NLS-1$
	buffer.append('\n');
	buffer.append(prefix);
	buffer.append(this.jarTypeCache.toStringFillingRation("Jar type cache")); //$NON-NLS-1$
	buffer.append('\n');
	return buffer.toString();
	}
	}