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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.procedure2;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import java.io.IOException;</span> |
| <span class="source-line-no">021</span><span id="line-21">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">022</span><span id="line-22">import org.apache.yetus.audience.InterfaceStability;</span> |
| <span class="source-line-no">023</span><span id="line-23"></span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.hbase.shaded.protobuf.generated.ProcedureProtos.SequentialProcedureData;</span> |
| <span class="source-line-no">025</span><span id="line-25"></span> |
| <span class="source-line-no">026</span><span id="line-26">/**</span> |
| <span class="source-line-no">027</span><span id="line-27"> * A SequentialProcedure describes one step in a procedure chain:</span> |
| <span class="source-line-no">028</span><span id="line-28"> *</span> |
| <span class="source-line-no">029</span><span id="line-29"> * <pre></span> |
| <span class="source-line-no">030</span><span id="line-30"> * -&gt; Step 1 -&gt; Step 2 -&gt; Step 3</span> |
| <span class="source-line-no">031</span><span id="line-31"> * </pre></span> |
| <span class="source-line-no">032</span><span id="line-32"> *</span> |
| <span class="source-line-no">033</span><span id="line-33"> * The main difference from a base Procedure is that the execute() of a SequentialProcedure will be</span> |
| <span class="source-line-no">034</span><span id="line-34"> * called only once; there will be no second execute() call once the children are finished. which</span> |
| <span class="source-line-no">035</span><span id="line-35"> * means once the child of a SequentialProcedure are completed the SequentialProcedure is completed</span> |
| <span class="source-line-no">036</span><span id="line-36"> * too.</span> |
| <span class="source-line-no">037</span><span id="line-37"> */</span> |
| <span class="source-line-no">038</span><span id="line-38">@InterfaceAudience.Private</span> |
| <span class="source-line-no">039</span><span id="line-39">@InterfaceStability.Evolving</span> |
| <span class="source-line-no">040</span><span id="line-40">public abstract class SequentialProcedure<TEnvironment> extends Procedure<TEnvironment> {</span> |
| <span class="source-line-no">041</span><span id="line-41"> private boolean executed = false;</span> |
| <span class="source-line-no">042</span><span id="line-42"></span> |
| <span class="source-line-no">043</span><span id="line-43"> @Override</span> |
| <span class="source-line-no">044</span><span id="line-44"> protected Procedure[] doExecute(final TEnvironment env)</span> |
| <span class="source-line-no">045</span><span id="line-45"> throws ProcedureYieldException, ProcedureSuspendedException, InterruptedException {</span> |
| <span class="source-line-no">046</span><span id="line-46"> updateTimestamp();</span> |
| <span class="source-line-no">047</span><span id="line-47"> try {</span> |
| <span class="source-line-no">048</span><span id="line-48"> Procedure[] children = !executed ? execute(env) : null;</span> |
| <span class="source-line-no">049</span><span id="line-49"> executed = !executed;</span> |
| <span class="source-line-no">050</span><span id="line-50"> return children;</span> |
| <span class="source-line-no">051</span><span id="line-51"> } finally {</span> |
| <span class="source-line-no">052</span><span id="line-52"> updateTimestamp();</span> |
| <span class="source-line-no">053</span><span id="line-53"> }</span> |
| <span class="source-line-no">054</span><span id="line-54"> }</span> |
| <span class="source-line-no">055</span><span id="line-55"></span> |
| <span class="source-line-no">056</span><span id="line-56"> @Override</span> |
| <span class="source-line-no">057</span><span id="line-57"> protected void doRollback(final TEnvironment env) throws IOException, InterruptedException {</span> |
| <span class="source-line-no">058</span><span id="line-58"> updateTimestamp();</span> |
| <span class="source-line-no">059</span><span id="line-59"> if (executed) {</span> |
| <span class="source-line-no">060</span><span id="line-60"> try {</span> |
| <span class="source-line-no">061</span><span id="line-61"> rollback(env);</span> |
| <span class="source-line-no">062</span><span id="line-62"> executed = !executed;</span> |
| <span class="source-line-no">063</span><span id="line-63"> } finally {</span> |
| <span class="source-line-no">064</span><span id="line-64"> updateTimestamp();</span> |
| <span class="source-line-no">065</span><span id="line-65"> }</span> |
| <span class="source-line-no">066</span><span id="line-66"> }</span> |
| <span class="source-line-no">067</span><span id="line-67"> }</span> |
| <span class="source-line-no">068</span><span id="line-68"></span> |
| <span class="source-line-no">069</span><span id="line-69"> @Override</span> |
| <span class="source-line-no">070</span><span id="line-70"> protected void serializeStateData(ProcedureStateSerializer serializer) throws IOException {</span> |
| <span class="source-line-no">071</span><span id="line-71"> SequentialProcedureData.Builder data = SequentialProcedureData.newBuilder();</span> |
| <span class="source-line-no">072</span><span id="line-72"> data.setExecuted(executed);</span> |
| <span class="source-line-no">073</span><span id="line-73"> serializer.serialize(data.build());</span> |
| <span class="source-line-no">074</span><span id="line-74"> }</span> |
| <span class="source-line-no">075</span><span id="line-75"></span> |
| <span class="source-line-no">076</span><span id="line-76"> @Override</span> |
| <span class="source-line-no">077</span><span id="line-77"> protected void deserializeStateData(ProcedureStateSerializer serializer) throws IOException {</span> |
| <span class="source-line-no">078</span><span id="line-78"> SequentialProcedureData data = serializer.deserialize(SequentialProcedureData.class);</span> |
| <span class="source-line-no">079</span><span id="line-79"> executed = data.getExecuted();</span> |
| <span class="source-line-no">080</span><span id="line-80"> }</span> |
| <span class="source-line-no">081</span><span id="line-81">}</span> |
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| </pre> |
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