org.apache.hadoop.hive.metastore.RawStoreProxy.java Source code

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Here is the source code for org.apache.hadoop.hive.metastore.RawStoreProxy.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.hadoop.hive.metastore;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.lang.reflect.UndeclaredThrowableException;
import java.util.List;
import java.util.concurrent.TimeUnit;

import org.apache.commons.lang.ClassUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.common.classification.InterfaceAudience;
import org.apache.hadoop.hive.common.classification.InterfaceStability;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.api.MetaException;
import org.apache.hadoop.util.ReflectionUtils;

@InterfaceAudience.Private
@InterfaceStability.Evolving
public class RawStoreProxy implements InvocationHandler {

    private final RawStore base;
    private final MetaStoreInit.MetaStoreInitData metaStoreInitData = new MetaStoreInit.MetaStoreInitData();
    private final HiveConf hiveConf;
    private final Configuration conf; // thread local conf from HMS
    private final long socketTimeout;

    protected RawStoreProxy(HiveConf hiveConf, Configuration conf, Class<? extends RawStore> rawStoreClass, int id)
            throws MetaException {
        this.conf = conf;
        this.hiveConf = hiveConf;
        this.socketTimeout = HiveConf.getTimeVar(hiveConf, HiveConf.ConfVars.METASTORE_CLIENT_SOCKET_TIMEOUT,
                TimeUnit.MILLISECONDS);

        // This has to be called before initializing the instance of RawStore
        init();

        this.base = ReflectionUtils.newInstance(rawStoreClass, conf);
    }

    public static RawStore getProxy(HiveConf hiveConf, Configuration conf, String rawStoreClassName, int id)
            throws MetaException {

        Class<? extends RawStore> baseClass = (Class<? extends RawStore>) MetaStoreUtils
                .getClass(rawStoreClassName);

        RawStoreProxy handler = new RawStoreProxy(hiveConf, conf, baseClass, id);

        // Look for interfaces on both the class and all base classes.
        return (RawStore) Proxy.newProxyInstance(RawStoreProxy.class.getClassLoader(), getAllInterfaces(baseClass),
                handler);
    }

    private static Class<?>[] getAllInterfaces(Class<?> baseClass) {
        List interfaces = ClassUtils.getAllInterfaces(baseClass);
        Class<?>[] result = new Class<?>[interfaces.size()];
        int i = 0;
        for (Object o : interfaces) {
            result[i++] = (Class<?>) o;
        }
        return result;
    }

    private void init() throws MetaException {
        // Using the hook on startup ensures that the hook always has priority
        // over settings in *.xml.  The thread local conf needs to be used because at this point
        // it has already been initialized using hiveConf.
        MetaStoreInit.updateConnectionURL(hiveConf, getConf(), null, metaStoreInitData);
    }

    private void initMS() {
        base.setConf(getConf());
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        try {
            Deadline.registerIfNot(socketTimeout);
            boolean isTimerStarted = Deadline.startTimer(method.getName());
            try {
                return method.invoke(base, args);
            } finally {
                if (isTimerStarted) {
                    Deadline.stopTimer();
                }
            }
        } catch (UndeclaredThrowableException e) {
            throw e.getCause();
        } catch (InvocationTargetException e) {
            throw e.getCause();
        }
    }

    public Configuration getConf() {
        return conf;
    }

}