| /******************************************************************************* |
| * Copyright (c) 2010, 2015 Sonatype, Inc. |
| * 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: |
| * Stuart McCulloch (Sonatype, Inc.) - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.sisu.inject; |
| |
| import java.lang.ref.SoftReference; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| |
| /** |
| * Utility methods for dealing with {@link SoftReference} collections. |
| */ |
| @SuppressWarnings( { "rawtypes", "unchecked" } ) |
| public final class Soft |
| { |
| // ---------------------------------------------------------------------- |
| // Constructors |
| // ---------------------------------------------------------------------- |
| |
| private Soft() |
| { |
| // static utility class, not allowed to create instances |
| } |
| |
| // ---------------------------------------------------------------------- |
| // Utility methods |
| // ---------------------------------------------------------------------- |
| |
| /** |
| * @return {@link Collection} whose elements are kept alive with {@link SoftReference}s |
| */ |
| public static <T> Collection<T> elements() |
| { |
| return elements( 10 ); |
| } |
| |
| /** |
| * @param capacity The initial capacity |
| * @return {@link Collection} whose elements are kept alive with {@link SoftReference}s |
| */ |
| public static <T> Collection<T> elements( final int capacity ) |
| { |
| return new MildElements( new ArrayList( capacity ), true ); |
| } |
| |
| /** |
| * @return {@link Map} whose keys are kept alive with {@link SoftReference}s |
| */ |
| public static <K, V> Map<K, V> keys() |
| { |
| return keys( 16 ); |
| } |
| |
| /** |
| * @param capacity The initial capacity |
| * @return {@link Map} whose keys are kept alive with {@link SoftReference}s |
| */ |
| public static <K, V> Map<K, V> keys( final int capacity ) |
| { |
| return new MildKeys( new HashMap( capacity ), true ); |
| } |
| |
| /** |
| * @return {@link ConcurrentMap} whose keys are kept alive with {@link SoftReference}s |
| */ |
| public static <K, V> ConcurrentMap<K, V> concurrentKeys() |
| { |
| return concurrentKeys( 16, 1 ); |
| } |
| |
| /** |
| * @param capacity The initial capacity |
| * @param concurrency The concurrency level |
| * @return {@link ConcurrentMap} whose keys are kept alive with {@link SoftReference}s |
| */ |
| public static <K, V> ConcurrentMap<K, V> concurrentKeys( final int capacity, final int concurrency ) |
| { |
| return new MildConcurrentKeys( new ConcurrentHashMap( capacity, 0.75f, concurrency ), true ); |
| } |
| |
| /** |
| * @return {@link Map} whose values are kept alive with {@link SoftReference}s |
| */ |
| public static <K, V> Map<K, V> values() |
| { |
| return values( 16 ); |
| } |
| |
| /** |
| * @param capacity The initial capacity |
| * @return {@link Map} whose values are kept alive with {@link SoftReference}s |
| */ |
| public static <K, V> Map<K, V> values( final int capacity ) |
| { |
| return new MildValues( new HashMap( capacity ), true ); |
| } |
| |
| /** |
| * @return {@link ConcurrentMap} whose values are kept alive with {@link SoftReference}s |
| */ |
| public static <K, V> ConcurrentMap<K, V> concurrentValues() |
| { |
| return concurrentValues( 16, 1 ); |
| } |
| |
| /** |
| * @param capacity The initial capacity |
| * @param concurrency The concurrency level |
| * @return {@link ConcurrentMap} whose values are kept alive with {@link SoftReference}s |
| */ |
| public static <K, V> ConcurrentMap<K, V> concurrentValues( final int capacity, final int concurrency ) |
| { |
| return new MildConcurrentValues( new ConcurrentHashMap( capacity, 0.75f, concurrency ), true ); |
| } |
| } |