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A bundle project producing JAX-RS RI bundles. The primary artifact is an "all-in-one" OSGi-fied JAX-RS RI bundle (jaxrs-ri.jar). Attached to that are two compressed JAX-RS RI archives. The first archive (jaxrs-ri.zip) consists of binary RI bits and contains the API jar (under "api" directory), RI libraries (under "lib" directory) as well as all external RI dependencies (under "ext" directory). The secondary archive (jaxrs-ri-src.zip) contains buildable JAX-RS RI source bundle and contains the API jar (under "api" directory), RI sources (under "src" directory) as well as all external RI dependencies (under "ext" directory). The second archive also contains "build.xml" ANT script that builds the RI sources. To build the JAX-RS RI simply unzip the archive, cd to the created jaxrs-ri directory and invoke "ant" from the command line.

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/*
 * Copyright (c) 2022 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.jersey.internal.util.collection;

import org.glassfish.jersey.internal.guava.Cache;
import org.glassfish.jersey.internal.guava.CacheBuilder;

import java.util.concurrent.TimeUnit;

/**
 * An abstract LRU interface wrapping an actual LRU implementation.
 * @param  Key type
 * @param  Value type
 * @Since 2.38
 */
public abstract class LRU {

    /**
     * Returns the value associated with {@code key} in this cache, or {@code null} if there is no
     * cached value for {@code key}.
     */
    public abstract V getIfPresent(Object key);

    /**
     * Associates {@code value} with {@code key} in this cache. If the cache previously contained a
     * value associated with {@code key}, the old value is replaced by {@code value}.
     */
    public abstract void put(K key, V value);

    /**
     * Create new LRU
     * @return new LRU
     */
    public static  LRU create() {
        return LRUFactory.createLRU();
    }

    private static class LRUFactory {
        // TODO configure via the Configuration
        public static final int LRU_CACHE_SIZE = 128;
        public static final long TIMEOUT = 5000L;
        private static  LRU createLRU() {
            final Cache CACHE = CacheBuilder.newBuilder()
                    .maximumSize(LRU_CACHE_SIZE)
                    .expireAfterAccess(TIMEOUT, TimeUnit.MILLISECONDS)
                    .build();
            return new LRU() {
                @Override
                public V getIfPresent(Object key) {
                    return CACHE.getIfPresent(key);
                }

                @Override
                public void put(K key, V value) {
                    CACHE.put(key, value);
                }
            };
        }
    }


}