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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.namequeues;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import com.lmax.disruptor.EventHandler;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import com.lmax.disruptor.RingBuffer;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.lang.reflect.InvocationTargetException;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.HashMap;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.Map;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.apache.hadoop.conf.Configuration;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.client.Connection;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.namequeues.request.NamedQueueGetRequest;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.namequeues.response.NamedQueueGetResponse;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.slf4j.Logger;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.slf4j.LoggerFactory;<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>/**<a name="line.33"></a>
<span class="sourceLineNo">034</span> * Event Handler run by disruptor ringbuffer consumer. Although this is generic implementation for<a name="line.34"></a>
<span class="sourceLineNo">035</span> * namedQueue, it can have individual queue specific logic.<a name="line.35"></a>
<span class="sourceLineNo">036</span> */<a name="line.36"></a>
<span class="sourceLineNo">037</span>@InterfaceAudience.Private<a name="line.37"></a>
<span class="sourceLineNo">038</span>class LogEventHandler implements EventHandler&lt;RingBufferEnvelope&gt; {<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span> private static final Logger LOG = LoggerFactory.getLogger(LogEventHandler.class);<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span> // Map that binds namedQueues to corresponding queue service implementation.<a name="line.42"></a>
<span class="sourceLineNo">043</span> // If NamedQueue of specific type is enabled, corresponding service will be used to<a name="line.43"></a>
<span class="sourceLineNo">044</span> // insert and retrieve records.<a name="line.44"></a>
<span class="sourceLineNo">045</span> // Individual queue sizes should be determined based on their individual configs within<a name="line.45"></a>
<span class="sourceLineNo">046</span> // each service.<a name="line.46"></a>
<span class="sourceLineNo">047</span> private final Map&lt;NamedQueuePayload.NamedQueueEvent, NamedQueueService&gt; namedQueueServices =<a name="line.47"></a>
<span class="sourceLineNo">048</span> new HashMap&lt;&gt;();<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span> private static final String NAMED_QUEUE_PROVIDER_CLASSES = "hbase.namedqueue.provider.classes";<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span> LogEventHandler(final Configuration conf) {<a name="line.52"></a>
<span class="sourceLineNo">053</span> for (String implName : conf.getStringCollection(NAMED_QUEUE_PROVIDER_CLASSES)) {<a name="line.53"></a>
<span class="sourceLineNo">054</span> Class&lt;?&gt; clz;<a name="line.54"></a>
<span class="sourceLineNo">055</span> try {<a name="line.55"></a>
<span class="sourceLineNo">056</span> clz = Class.forName(implName);<a name="line.56"></a>
<span class="sourceLineNo">057</span> } catch (ClassNotFoundException e) {<a name="line.57"></a>
<span class="sourceLineNo">058</span> LOG.warn("Failed to find NamedQueueService implementor class {}", implName, e);<a name="line.58"></a>
<span class="sourceLineNo">059</span> continue;<a name="line.59"></a>
<span class="sourceLineNo">060</span> }<a name="line.60"></a>
<span class="sourceLineNo">061</span><a name="line.61"></a>
<span class="sourceLineNo">062</span> if (!NamedQueueService.class.isAssignableFrom(clz)) {<a name="line.62"></a>
<span class="sourceLineNo">063</span> LOG.warn("Class {} is not implementor of NamedQueueService.", clz);<a name="line.63"></a>
<span class="sourceLineNo">064</span> continue;<a name="line.64"></a>
<span class="sourceLineNo">065</span> }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span> // add all service mappings here<a name="line.67"></a>
<span class="sourceLineNo">068</span> try {<a name="line.68"></a>
<span class="sourceLineNo">069</span> NamedQueueService namedQueueService =<a name="line.69"></a>
<span class="sourceLineNo">070</span> (NamedQueueService) clz.getConstructor(Configuration.class).newInstance(conf);<a name="line.70"></a>
<span class="sourceLineNo">071</span> namedQueueServices.put(namedQueueService.getEvent(), namedQueueService);<a name="line.71"></a>
<span class="sourceLineNo">072</span> } catch (InstantiationException | IllegalAccessException | NoSuchMethodException<a name="line.72"></a>
<span class="sourceLineNo">073</span> | InvocationTargetException e) {<a name="line.73"></a>
<span class="sourceLineNo">074</span> LOG.warn("Unable to instantiate/add NamedQueueService implementor {} to service map.", clz,<a name="line.74"></a>
<span class="sourceLineNo">075</span> e);<a name="line.75"></a>
<span class="sourceLineNo">076</span> }<a name="line.76"></a>
<span class="sourceLineNo">077</span> }<a name="line.77"></a>
<span class="sourceLineNo">078</span> }<a name="line.78"></a>
<span class="sourceLineNo">079</span><a name="line.79"></a>
<span class="sourceLineNo">080</span> /**<a name="line.80"></a>
<span class="sourceLineNo">081</span> * Called when a publisher has published an event to the {@link RingBuffer}. This is generic<a name="line.81"></a>
<span class="sourceLineNo">082</span> * consumer of disruptor ringbuffer and for each new namedQueue that we add, we should also<a name="line.82"></a>
<span class="sourceLineNo">083</span> * provide specific consumer logic here.<a name="line.83"></a>
<span class="sourceLineNo">084</span> * @param event published to the {@link RingBuffer}<a name="line.84"></a>
<span class="sourceLineNo">085</span> * @param sequence of the event being processed<a name="line.85"></a>
<span class="sourceLineNo">086</span> * @param endOfBatch flag to indicate if this is the last event in a batch from the<a name="line.86"></a>
<span class="sourceLineNo">087</span> * {@link RingBuffer}<a name="line.87"></a>
<span class="sourceLineNo">088</span> */<a name="line.88"></a>
<span class="sourceLineNo">089</span> @Override<a name="line.89"></a>
<span class="sourceLineNo">090</span> public void onEvent(RingBufferEnvelope event, long sequence, boolean endOfBatch) {<a name="line.90"></a>
<span class="sourceLineNo">091</span> final NamedQueuePayload namedQueuePayload = event.getPayload();<a name="line.91"></a>
<span class="sourceLineNo">092</span> // consume ringbuffer payload based on event type<a name="line.92"></a>
<span class="sourceLineNo">093</span> namedQueueServices.get(namedQueuePayload.getNamedQueueEvent())<a name="line.93"></a>
<span class="sourceLineNo">094</span> .consumeEventFromDisruptor(namedQueuePayload);<a name="line.94"></a>
<span class="sourceLineNo">095</span> }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span> /**<a name="line.97"></a>
<span class="sourceLineNo">098</span> * Cleans up queues maintained by services.<a name="line.98"></a>
<span class="sourceLineNo">099</span> * @param namedQueueEvent type of queue to clear<a name="line.99"></a>
<span class="sourceLineNo">100</span> * @return true if queue is cleaned up, false otherwise<a name="line.100"></a>
<span class="sourceLineNo">101</span> */<a name="line.101"></a>
<span class="sourceLineNo">102</span> boolean clearNamedQueue(NamedQueuePayload.NamedQueueEvent namedQueueEvent) {<a name="line.102"></a>
<span class="sourceLineNo">103</span> return namedQueueServices.get(namedQueueEvent).clearNamedQueue();<a name="line.103"></a>
<span class="sourceLineNo">104</span> }<a name="line.104"></a>
<span class="sourceLineNo">105</span><a name="line.105"></a>
<span class="sourceLineNo">106</span> /**<a name="line.106"></a>
<span class="sourceLineNo">107</span> * Add all in memory queue records to system table. The implementors can use system table or<a name="line.107"></a>
<span class="sourceLineNo">108</span> * direct HDFS file or ZK as persistence system.<a name="line.108"></a>
<span class="sourceLineNo">109</span> */<a name="line.109"></a>
<span class="sourceLineNo">110</span> void persistAll(NamedQueuePayload.NamedQueueEvent namedQueueEvent, Connection connection) {<a name="line.110"></a>
<span class="sourceLineNo">111</span> namedQueueServices.get(namedQueueEvent).persistAll(connection);<a name="line.111"></a>
<span class="sourceLineNo">112</span> }<a name="line.112"></a>
<span class="sourceLineNo">113</span><a name="line.113"></a>
<span class="sourceLineNo">114</span> /**<a name="line.114"></a>
<span class="sourceLineNo">115</span> * Retrieve in memory queue records from ringbuffer<a name="line.115"></a>
<span class="sourceLineNo">116</span> * @param request namedQueue request with event type<a name="line.116"></a>
<span class="sourceLineNo">117</span> * @return queue records from ringbuffer after filter (if applied)<a name="line.117"></a>
<span class="sourceLineNo">118</span> */<a name="line.118"></a>
<span class="sourceLineNo">119</span> NamedQueueGetResponse getNamedQueueRecords(NamedQueueGetRequest request) {<a name="line.119"></a>
<span class="sourceLineNo">120</span> return namedQueueServices.get(request.getNamedQueueEvent()).getNamedQueueRecords(request);<a name="line.120"></a>
<span class="sourceLineNo">121</span> }<a name="line.121"></a>
<span class="sourceLineNo">122</span><a name="line.122"></a>
<span class="sourceLineNo">123</span>}<a name="line.123"></a>
</pre>
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