monasca.common.middleware.TokenCache.java Source code

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Here is the source code for monasca.common.middleware.TokenCache.java

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/*
 * Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
 * 
 * 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.
 */
package monasca.common.middleware;

import com.google.common.cache.*;
import org.apache.http.client.ClientProtocolException;
import org.apache.thrift.TException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

public class TokenCache {

    private final LoadingCache<String, String> cache;
    private final Config appConfig = Config.getInstance();
    private AuthClientFactory factory;
    private static final Logger logger = LoggerFactory.getLogger(TokenCache.class);

    public TokenCache(final long maxSize, final long timeToExpire) {
        factory = appConfig.getFactory();

        cache = CacheBuilder.newBuilder().maximumSize(maxSize).expireAfterWrite(timeToExpire, TimeUnit.SECONDS)
                .build(new CacheLoader<String, String>() {
                    public String load(String key) throws TException, ClientProtocolException {

                        String value = null;
                        AuthClient client = null;

                        try {
                            client = factory.getClient();
                            value = client.validateTokenForServiceEndpointV3(key);
                        } finally {
                            if (client != null)
                                factory.recycle(client);
                        }
                        return value;
                    }
                });
    }

    public String getToken(String key) throws ClientProtocolException {
        String value = null;
        try {
            value = cache.get(key);
        } catch (ExecutionException e) {
            logger.info("Failed to get token", e);
            throw new ClientProtocolException(e.getMessage(), e);
        }
        return value;
    }

    public void put(String key, String value) {
        cache.put(key, value);
    }

}