cache/src/main/java/org/jclouds/karaf/cache/CacheManager.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.jclouds.karaf.cache;

import org.jclouds.karaf.cache.tasks.UpdateCachesTask;

import java.util.Arrays;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

import static org.jclouds.karaf.utils.ServiceHelper.toId;

public class CacheManager<T> implements Runnable {

    protected ScheduledExecutorService scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
    protected final List<Cacheable<T>> cacheables = new LinkedList<Cacheable<T>> ();
    protected final Map<String, T> services = new HashMap<String, T>();

    private UpdateCachesTask updatesCachesTask;

    public void init() {
      scheduledExecutorService.scheduleAtFixedRate(this,0,5, TimeUnit.MINUTES);
    }
    public void destroy() {
      if (updatesCachesTask != null) {
        updatesCachesTask.stop();
      }
      scheduledExecutorService.shutdownNow();
    }

    @Override
    public void run() {
        //Update all cacheables for all services.
        this.updatesCachesTask = new UpdateCachesTask(cacheables,services);
        this.updatesCachesTask.run();
    }

    public void bindService(T service) {
        Map<String, T> map = new HashMap<String, T>();
        map.put(toId(service), service);
        services.putAll(map);
        scheduledExecutorService.submit(new UpdateCachesTask(cacheables, map));
    }

    public void unbindService(T service) {
        if (services != null && service != null) {
            this.services.remove(toId(service));
        }
    }

    public void bindCacheable(Cacheable<T> cacheable) {
        this.cacheables.add(cacheable);
        scheduledExecutorService.submit(new UpdateCachesTask(Arrays.asList(cacheable), services));
    }

    public void unbindCacheable(Cacheable<T> cacheable) {
        if (cacheables != null) {
            this.cacheables.remove(cacheable);
        }
    }
}