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| <pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> *<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> *<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> */<a name="line.17"></a> |
| <span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.coprocessor;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import java.util.Optional;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import org.apache.hadoop.hbase.CoprocessorEnvironment;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import org.apache.hadoop.hbase.ipc.RpcServer;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import org.apache.hadoop.hbase.security.User;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span><a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span><a name="line.27"></a> |
| <span class="sourceLineNo">028</span>/**<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> * This is the only implementation of {@link ObserverContext}, which serves as the interface for<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> * third-party Coprocessor developers.<a name="line.30"></a> |
| <span class="sourceLineNo">031</span> */<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>@InterfaceAudience.Private<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>public class ObserverContextImpl<E extends CoprocessorEnvironment> implements ObserverContext<E> {<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> private E env;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> private boolean bypass;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> /**<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> * Is this operation bypassable?<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> */<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> private final boolean bypassable;<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> private final User caller;<a name="line.40"></a> |
| <span class="sourceLineNo">041</span><a name="line.41"></a> |
| <span class="sourceLineNo">042</span> public ObserverContextImpl(User caller) {<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> this(caller, false);<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> }<a name="line.44"></a> |
| <span class="sourceLineNo">045</span><a name="line.45"></a> |
| <span class="sourceLineNo">046</span> public ObserverContextImpl(User caller, boolean bypassable) {<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> this.caller = caller;<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> this.bypassable = bypassable;<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> }<a name="line.49"></a> |
| <span class="sourceLineNo">050</span><a name="line.50"></a> |
| <span class="sourceLineNo">051</span> @Override<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> public E getEnvironment() {<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> return env;<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> }<a name="line.54"></a> |
| <span class="sourceLineNo">055</span><a name="line.55"></a> |
| <span class="sourceLineNo">056</span> public void prepare(E env) {<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> this.env = env;<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> }<a name="line.58"></a> |
| <span class="sourceLineNo">059</span><a name="line.59"></a> |
| <span class="sourceLineNo">060</span> public boolean isBypassable() {<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> return this.bypassable;<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> }<a name="line.62"></a> |
| <span class="sourceLineNo">063</span><a name="line.63"></a> |
| <span class="sourceLineNo">064</span> @Override<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> public void bypass() {<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> if (!this.bypassable) {<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> throw new UnsupportedOperationException("This method does not support 'bypass'.");<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> }<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> bypass = true;<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> }<a name="line.70"></a> |
| <span class="sourceLineNo">071</span><a name="line.71"></a> |
| <span class="sourceLineNo">072</span> /**<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> * @return {@code true}, if {@link ObserverContext#bypass()} was called by one of the loaded<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> * coprocessors, {@code false} otherwise.<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> */<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> public boolean shouldBypass() {<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> if (!isBypassable()) {<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> return false;<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> }<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> if (bypass) {<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> bypass = false;<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> return true;<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> }<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> return false;<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> }<a name="line.85"></a> |
| <span class="sourceLineNo">086</span><a name="line.86"></a> |
| <span class="sourceLineNo">087</span> @Override<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> public Optional<User> getCaller() {<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> return Optional.ofNullable(caller);<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> }<a name="line.90"></a> |
| <span class="sourceLineNo">091</span><a name="line.91"></a> |
| <span class="sourceLineNo">092</span> /**<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> * Instantiates a new ObserverContext instance if the passed reference is <code>null</code> and<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> * sets the environment in the new or existing instance. This allows deferring the instantiation<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> * of a ObserverContext until it is actually needed.<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> * @param <E> The environment type for the context<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> * @param env The coprocessor environment to set<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> * @return An instance of <code>ObserverContext</code> with the environment set<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> */<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> @Deprecated<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> @VisibleForTesting<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> // TODO: Remove this method, ObserverContext should not depend on RpcServer<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> public static <E extends CoprocessorEnvironment> ObserverContext<E> createAndPrepare(E env) {<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> ObserverContextImpl<E> ctx = new ObserverContextImpl<>(RpcServer.getRequestUser().orElse(null));<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> ctx.prepare(env);<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> return ctx;<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> }<a name="line.107"></a> |
| <span class="sourceLineNo">108</span>}<a name="line.108"></a> |
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