001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.thrift;
019
020import java.lang.reflect.InvocationHandler;
021import java.lang.reflect.InvocationTargetException;
022import java.lang.reflect.Method;
023import java.lang.reflect.Proxy;
024import org.apache.hadoop.conf.Configuration;
025import org.apache.hadoop.hbase.thrift.generated.Hbase;
026import org.apache.hadoop.hbase.thrift2.generated.THBaseService;
027import org.apache.yetus.audience.InterfaceAudience;
028
029/**
030 * Converts a Hbase.Iface using InvocationHandler so that it reports process time of each call to
031 * ThriftMetrics.
032 */
033@InterfaceAudience.Private
034public final class HbaseHandlerMetricsProxy implements InvocationHandler {
035
036  private final Object handler;
037  private final ThriftMetrics metrics;
038
039  public static Hbase.Iface newInstance(Hbase.Iface handler, ThriftMetrics metrics,
040    Configuration conf) {
041    return (Hbase.Iface) Proxy.newProxyInstance(handler.getClass().getClassLoader(),
042      new Class[] { Hbase.Iface.class }, new HbaseHandlerMetricsProxy(handler, metrics, conf));
043  }
044
045  // for thrift 2
046  public static THBaseService.Iface newInstance(THBaseService.Iface handler, ThriftMetrics metrics,
047    Configuration conf) {
048    return (THBaseService.Iface) Proxy.newProxyInstance(handler.getClass().getClassLoader(),
049      new Class[] { THBaseService.Iface.class },
050      new HbaseHandlerMetricsProxy(handler, metrics, conf));
051  }
052
053  private HbaseHandlerMetricsProxy(Object handler, ThriftMetrics metrics, Configuration conf) {
054    this.handler = handler;
055    this.metrics = metrics;
056  }
057
058  @Override
059  public Object invoke(Object proxy, Method m, Object[] args) throws Throwable {
060    Object result;
061    long start = now();
062    try {
063      result = m.invoke(handler, args);
064    } catch (InvocationTargetException e) {
065      metrics.exception(e.getCause());
066      throw e.getTargetException();
067    } catch (Exception e) {
068      metrics.exception(e);
069      throw new RuntimeException("unexpected invocation exception: " + e.getMessage());
070    } finally {
071      long processTime = now() - start;
072      metrics.incMethodTime(m.getName(), processTime);
073    }
074    return result;
075  }
076
077  private static long now() {
078    return System.nanoTime();
079  }
080}