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.ipc;
019
020import java.io.IOException;
021import java.util.Optional;
022import org.apache.commons.lang3.builder.ToStringBuilder;
023import org.apache.commons.lang3.builder.ToStringStyle;
024import org.apache.hadoop.hbase.CellScanner;
025import org.apache.hadoop.hbase.client.MetricsConnection;
026import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
027import org.apache.htrace.core.Span;
028import org.apache.htrace.core.Tracer;
029import org.apache.yetus.audience.InterfaceAudience;
030import org.apache.hbase.thirdparty.com.google.protobuf.Descriptors;
031import org.apache.hbase.thirdparty.com.google.protobuf.Message;
032import org.apache.hbase.thirdparty.com.google.protobuf.RpcCallback;
033import org.apache.hbase.thirdparty.io.netty.util.Timeout;
034import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
035
036/** A call waiting for a value. */
037@InterfaceAudience.Private
038class Call {
039  final int id; // call id
040  final Message param; // rpc request method param object
041  /**
042   * Optionally has cells when making call. Optionally has cells set on response. Used passing cells
043   * to the rpc and receiving the response.
044   */
045  CellScanner cells;
046  @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "IS2_INCONSISTENT_SYNC",
047      justification = "Direct access is only allowed after done")
048  Message response; // value, null if error
049  // The return type. Used to create shell into which we deserialize the response if any.
050  Message responseDefaultType;
051  @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "IS2_INCONSISTENT_SYNC",
052    justification = "Direct access is only allowed after done")
053  IOException error; // exception, null if value
054  private boolean done; // true when call is done
055  final Descriptors.MethodDescriptor md;
056  final int timeout; // timeout in millisecond for this call; 0 means infinite.
057  final int priority;
058  final MetricsConnection.CallStats callStats;
059  private final RpcCallback<Call> callback;
060  final Span span;
061  Timeout timeoutTask;
062
063  protected Call(int id, final Descriptors.MethodDescriptor md, Message param,
064      final CellScanner cells, final Message responseDefaultType, int timeout, int priority,
065      RpcCallback<Call> callback, MetricsConnection.CallStats callStats) {
066    this.param = param;
067    this.md = md;
068    this.cells = cells;
069    this.callStats = callStats;
070    this.callStats.setStartTime(EnvironmentEdgeManager.currentTime());
071    this.responseDefaultType = responseDefaultType;
072    this.id = id;
073    this.timeout = timeout;
074    this.priority = priority;
075    this.callback = callback;
076    this.span = Tracer.getCurrentSpan();
077  }
078
079  /**
080   * Builds a simplified {@link #toString()} that includes just the id and method name.
081   */
082  public String toShortString() {
083    return new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE)
084      .append("id", id)
085      .append("methodName", md.getName())
086      .toString();
087  }
088
089  @Override
090  public String toString() {
091    return new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE)
092      .appendSuper(toShortString())
093      .append("param", Optional.ofNullable(param)
094        .map(ProtobufUtil::getShortTextFormat)
095        .orElse(""))
096      .toString();
097  }
098
099  /**
100   * called from timeoutTask, prevent self cancel
101   */
102  public void setTimeout(IOException error) {
103    synchronized (this) {
104      if (done) {
105        return;
106      }
107      this.done = true;
108      this.error = error;
109    }
110    callback.run(this);
111  }
112
113  private void callComplete() {
114    if (timeoutTask != null) {
115      timeoutTask.cancel();
116    }
117    callback.run(this);
118  }
119
120  /**
121   * Set the exception when there is an error. Notify the caller the call is done.
122   * @param error exception thrown by the call; either local or remote
123   */
124  public void setException(IOException error) {
125    synchronized (this) {
126      if (done) {
127        return;
128      }
129      this.done = true;
130      this.error = error;
131    }
132    callComplete();
133  }
134
135  /**
136   * Set the return value when there is no error. Notify the caller the call is done.
137   * @param response return value of the call.
138   * @param cells Can be null
139   */
140  public void setResponse(Message response, final CellScanner cells) {
141    synchronized (this) {
142      if (done) {
143        return;
144      }
145      this.done = true;
146      this.response = response;
147      this.cells = cells;
148    }
149    callComplete();
150  }
151
152  public synchronized boolean isDone() {
153    return done;
154  }
155
156  public long getStartTime() {
157    return this.callStats.getStartTime();
158  }
159}