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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.constraint;</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 java.util.ArrayList;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.util.List;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.util.Optional;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.hbase.CoprocessorEnvironment;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.client.Durability;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.client.Put;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.client.TableDescriptor;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.hadoop.hbase.coprocessor.ObserverContext;</span> |
| <span class="source-line-no">029</span><span id="line-29">import org.apache.hadoop.hbase.coprocessor.RegionCoprocessor;</span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;</span> |
| <span class="source-line-no">031</span><span id="line-31">import org.apache.hadoop.hbase.coprocessor.RegionObserver;</span> |
| <span class="source-line-no">032</span><span id="line-32">import org.apache.hadoop.hbase.wal.WALEdit;</span> |
| <span class="source-line-no">033</span><span id="line-33">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">034</span><span id="line-34">import org.slf4j.Logger;</span> |
| <span class="source-line-no">035</span><span id="line-35">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">036</span><span id="line-36"></span> |
| <span class="source-line-no">037</span><span id="line-37">/***</span> |
| <span class="source-line-no">038</span><span id="line-38"> * Processes multiple {@link Constraint Constraints} on a given table.</span> |
| <span class="source-line-no">039</span><span id="line-39"> * <p></span> |
| <span class="source-line-no">040</span><span id="line-40"> * This is an ease of use mechanism - all the functionality here could be implemented on any given</span> |
| <span class="source-line-no">041</span><span id="line-41"> * system by a coprocessor.</span> |
| <span class="source-line-no">042</span><span id="line-42"> */</span> |
| <span class="source-line-no">043</span><span id="line-43">@InterfaceAudience.Private</span> |
| <span class="source-line-no">044</span><span id="line-44">public class ConstraintProcessor implements RegionCoprocessor, RegionObserver {</span> |
| <span class="source-line-no">045</span><span id="line-45"></span> |
| <span class="source-line-no">046</span><span id="line-46"> private static final Logger LOG = LoggerFactory.getLogger(ConstraintProcessor.class);</span> |
| <span class="source-line-no">047</span><span id="line-47"></span> |
| <span class="source-line-no">048</span><span id="line-48"> private final ClassLoader classloader;</span> |
| <span class="source-line-no">049</span><span id="line-49"></span> |
| <span class="source-line-no">050</span><span id="line-50"> private List<? extends Constraint> constraints = new ArrayList<>();</span> |
| <span class="source-line-no">051</span><span id="line-51"></span> |
| <span class="source-line-no">052</span><span id="line-52"> @Override</span> |
| <span class="source-line-no">053</span><span id="line-53"> public Optional<RegionObserver> getRegionObserver() {</span> |
| <span class="source-line-no">054</span><span id="line-54"> return Optional.of(this);</span> |
| <span class="source-line-no">055</span><span id="line-55"> }</span> |
| <span class="source-line-no">056</span><span id="line-56"></span> |
| <span class="source-line-no">057</span><span id="line-57"> /**</span> |
| <span class="source-line-no">058</span><span id="line-58"> * Create the constraint processor.</span> |
| <span class="source-line-no">059</span><span id="line-59"> * <p></span> |
| <span class="source-line-no">060</span><span id="line-60"> * Stores the current classloader.</span> |
| <span class="source-line-no">061</span><span id="line-61"> */</span> |
| <span class="source-line-no">062</span><span id="line-62"> public ConstraintProcessor() {</span> |
| <span class="source-line-no">063</span><span id="line-63"> classloader = this.getClass().getClassLoader();</span> |
| <span class="source-line-no">064</span><span id="line-64"> }</span> |
| <span class="source-line-no">065</span><span id="line-65"></span> |
| <span class="source-line-no">066</span><span id="line-66"> @Override</span> |
| <span class="source-line-no">067</span><span id="line-67"> public void start(CoprocessorEnvironment environment) {</span> |
| <span class="source-line-no">068</span><span id="line-68"> // make sure we are on a region server</span> |
| <span class="source-line-no">069</span><span id="line-69"> if (!(environment instanceof RegionCoprocessorEnvironment)) {</span> |
| <span class="source-line-no">070</span><span id="line-70"> throw new IllegalArgumentException(</span> |
| <span class="source-line-no">071</span><span id="line-71"> "Constraints only act on regions - started in an environment that was not a region");</span> |
| <span class="source-line-no">072</span><span id="line-72"> }</span> |
| <span class="source-line-no">073</span><span id="line-73"> RegionCoprocessorEnvironment env = (RegionCoprocessorEnvironment) environment;</span> |
| <span class="source-line-no">074</span><span id="line-74"> TableDescriptor desc = env.getRegion().getTableDescriptor();</span> |
| <span class="source-line-no">075</span><span id="line-75"> // load all the constraints from the HTD</span> |
| <span class="source-line-no">076</span><span id="line-76"> try {</span> |
| <span class="source-line-no">077</span><span id="line-77"> this.constraints = Constraints.getConstraints(desc, classloader);</span> |
| <span class="source-line-no">078</span><span id="line-78"> } catch (IOException e) {</span> |
| <span class="source-line-no">079</span><span id="line-79"> throw new IllegalArgumentException(e);</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> |
| <span class="source-line-no">082</span><span id="line-82"> if (LOG.isInfoEnabled()) {</span> |
| <span class="source-line-no">083</span><span id="line-83"> LOG.info("Finished loading " + constraints.size() + " user Constraints on table: "</span> |
| <span class="source-line-no">084</span><span id="line-84"> + desc.getTableName());</span> |
| <span class="source-line-no">085</span><span id="line-85"> }</span> |
| <span class="source-line-no">086</span><span id="line-86"></span> |
| <span class="source-line-no">087</span><span id="line-87"> }</span> |
| <span class="source-line-no">088</span><span id="line-88"></span> |
| <span class="source-line-no">089</span><span id="line-89"> @Override</span> |
| <span class="source-line-no">090</span><span id="line-90"> public void prePut(ObserverContext<RegionCoprocessorEnvironment> e, Put put, WALEdit edit,</span> |
| <span class="source-line-no">091</span><span id="line-91"> Durability durability) throws IOException {</span> |
| <span class="source-line-no">092</span><span id="line-92"> // check the put against the stored constraints</span> |
| <span class="source-line-no">093</span><span id="line-93"> for (Constraint c : constraints) {</span> |
| <span class="source-line-no">094</span><span id="line-94"> c.check(put);</span> |
| <span class="source-line-no">095</span><span id="line-95"> }</span> |
| <span class="source-line-no">096</span><span id="line-96"> // if we made it here, then the Put is valid</span> |
| <span class="source-line-no">097</span><span id="line-97"> }</span> |
| <span class="source-line-no">098</span><span id="line-98">}</span> |
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| </pre> |
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