org.apache.sentry.service.thrift.SentryServiceClientPoolFactory.java Source code

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Here is the source code for org.apache.sentry.service.thrift.SentryServiceClientPoolFactory.java

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/**
 * 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.apache.sentry.service.thrift;

import java.lang.reflect.Proxy;

import org.apache.commons.pool2.BasePooledObjectFactory;
import org.apache.commons.pool2.PooledObject;
import org.apache.commons.pool2.impl.DefaultPooledObject;
import org.apache.hadoop.conf.Configuration;
import org.apache.sentry.provider.db.service.thrift.SentryPolicyServiceClient;
import org.apache.sentry.provider.db.service.thrift.SentryPolicyServiceClientDefaultImpl;
import org.apache.sentry.service.thrift.ServiceConstants.ClientConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * SentryServiceClientPoolFactory is for connection pool to manage the object. Implement the related
 * method to create object, destroy object and wrap object.
 */

public class SentryServiceClientPoolFactory extends BasePooledObjectFactory<SentryPolicyServiceClient> {

    private static final Logger LOGGER = LoggerFactory.getLogger(SentryServiceClientPoolFactory.class);

    private Configuration conf;

    public SentryServiceClientPoolFactory(Configuration conf) {
        this.conf = conf;
    }

    @Override
    public SentryPolicyServiceClient create() throws Exception {
        LOGGER.debug("Creating Sentry Service Client...");
        boolean haEnabled = conf.getBoolean(ClientConfig.SERVER_HA_ENABLED, false);
        if (haEnabled) {
            return (SentryPolicyServiceClient) Proxy.newProxyInstance(
                    SentryPolicyServiceClientDefaultImpl.class.getClassLoader(),
                    SentryPolicyServiceClientDefaultImpl.class.getInterfaces(),
                    new HAClientInvocationHandler(conf));
        } else {
            return new SentryPolicyServiceClientDefaultImpl(conf);
        }
    }

    @Override
    public PooledObject<SentryPolicyServiceClient> wrap(SentryPolicyServiceClient client) {
        return new DefaultPooledObject<SentryPolicyServiceClient>(client);
    }

    @Override
    public void destroyObject(PooledObject<SentryPolicyServiceClient> pooledObject) {
        SentryPolicyServiceClient client = pooledObject.getObject();
        LOGGER.debug("Destroying Sentry Service Client: " + client);
        if (client != null) {
            // The close() of TSocket or TSaslClientTransport is called actually, and there has no
            // exception even there has some problems, eg, the client is closed already.
            // The close here is just try to close the socket and the client will be destroyed soon.
            client.close();
        }
    }
}