CachedRemoteRouterManager.java

/*
 * (C) Copyright 2015-2016 the original author or authors.
 *
 * Licensed 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.
 *
 * Contributors:
 *   ohun@live.cn (夜色)
 */

package com.mpush.common.router;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;

import java.util.Set;
import java.util.concurrent.TimeUnit;

/**
 * Created by ohun on 2016/1/4.
 *
 * @author ohun@live.cn (夜色)
 */
public final class CachedRemoteRouterManager extends RemoteRouterManager {
    public static final CachedRemoteRouterManager I = new CachedRemoteRouterManager();
    private final Cache<String, Set<RemoteRouter>> cache = CacheBuilder
            .newBuilder()
            .expireAfterWrite(5, TimeUnit.MINUTES)
            .expireAfterAccess(5, TimeUnit.MINUTES)
            .build();

    @Override
    public Set<RemoteRouter> lookupAll(String userId) {
        Set<RemoteRouter> cached = cache.getIfPresent(userId);
        if (cached != null) return cached;
        Set<RemoteRouter> remoteRouters = super.lookupAll(userId);
        if (remoteRouters != null) {
            cache.put(userId, remoteRouters);
        }
        return remoteRouters;
    }

    @Override
    public RemoteRouter lookup(String userId, int clientType) {
        Set<RemoteRouter> cached = this.lookupAll(userId);
        for (RemoteRouter remoteRouter : cached) {
            if (remoteRouter.getRouteValue().getClientType() == clientType) {
                return remoteRouter;
            }
        }
        return null;
    }

    /**
     * 如果推送失败，可能是缓存不一致了，可以让本地缓存失效
     * <p>
     * 失效对应的本地缓存
     *
     * @param userId
     */
    public void invalidateLocalCache(String userId) {
        if (userId != null) cache.invalidate(userId);
    }
}