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<a class="jxr_linenumber" name="1" href="#1">1</a> <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one</em>
<a class="jxr_linenumber" name="3" href="#3">3</a> <em class="jxr_comment"> * or more contributor license agreements. See the NOTICE file</em>
<a class="jxr_linenumber" name="4" href="#4">4</a> <em class="jxr_comment"> * distributed with this work for additional information</em>
<a class="jxr_linenumber" name="5" href="#5">5</a> <em class="jxr_comment"> * regarding copyright ownership. The ASF licenses this file</em>
<a class="jxr_linenumber" name="6" href="#6">6</a> <em class="jxr_comment"> * to you under the Apache License, Version 2.0 (the</em>
<a class="jxr_linenumber" name="7" href="#7">7</a> <em class="jxr_comment"> * "License"); you may not use this file except in compliance</em>
<a class="jxr_linenumber" name="8" href="#8">8</a> <em class="jxr_comment"> * with the License. You may obtain a copy of the License at</em>
<a class="jxr_linenumber" name="9" href="#9">9</a> <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="11" href="#11">11</a> <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="12" href="#12">12</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="13" href="#13">13</a> <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a class="jxr_linenumber" name="14" href="#14">14</a> <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a class="jxr_linenumber" name="15" href="#15">15</a> <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
<a class="jxr_linenumber" name="16" href="#16">16</a> <em class="jxr_comment"> * limitations under the License.</em>
<a class="jxr_linenumber" name="17" href="#17">17</a> <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="18" href="#18">18</a> <strong class="jxr_keyword">package</strong> org.apache.omid.tso;
<a class="jxr_linenumber" name="19" href="#19">19</a>
<a class="jxr_linenumber" name="20" href="#20">20</a> <strong class="jxr_keyword">import</strong> org.apache.phoenix.thirdparty.com.google.common.base.Preconditions;
<a class="jxr_linenumber" name="21" href="#21">21</a> <strong class="jxr_keyword">import</strong> org.slf4j.Logger;
<a class="jxr_linenumber" name="22" href="#22">22</a> <strong class="jxr_keyword">import</strong> org.slf4j.LoggerFactory;
<a class="jxr_linenumber" name="23" href="#23">23</a>
<a class="jxr_linenumber" name="24" href="#24">24</a> <strong class="jxr_keyword">import</strong> javax.inject.Inject;
<a class="jxr_linenumber" name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> java.util.ArrayList;
<a class="jxr_linenumber" name="26" href="#26">26</a> <strong class="jxr_keyword">import</strong> java.util.List;
<a class="jxr_linenumber" name="27" href="#27">27</a>
<a class="jxr_linenumber" name="28" href="#28">28</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="29" href="#29">29</a> <em class="jxr_javadoccomment"> * Implements the management of the state of the TSO</em>
<a class="jxr_linenumber" name="30" href="#30">30</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="31" href="#31">31</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/omid/tso/TSOStateManagerImpl.html">TSOStateManagerImpl</a> <strong class="jxr_keyword">implements</strong> <a href="../../../../org/apache/omid/tso/TSOStateManager.html">TSOStateManager</a> {
<a class="jxr_linenumber" name="32" href="#32">32</a>
<a class="jxr_linenumber" name="33" href="#33">33</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> Logger LOG = LoggerFactory.getLogger(TSOStateManagerImpl.<strong class="jxr_keyword">class</strong>);
<a class="jxr_linenumber" name="34" href="#34">34</a>
<a class="jxr_linenumber" name="35" href="#35">35</a> <strong class="jxr_keyword">private</strong> List&lt;StateObserver&gt; stateObservers = <strong class="jxr_keyword">new</strong> ArrayList&lt;&gt;();
<a class="jxr_linenumber" name="36" href="#36">36</a>
<a class="jxr_linenumber" name="37" href="#37">37</a> <strong class="jxr_keyword">private</strong> <a href="../../../../org/apache/omid/tso/TSOStateManager.html">TSOState</a> state;
<a class="jxr_linenumber" name="38" href="#38">38</a>
<a class="jxr_linenumber" name="39" href="#39">39</a> <strong class="jxr_keyword">private</strong> <a href="../../../../org/apache/omid/tso/TimestampOracle.html">TimestampOracle</a> timestampOracle;
<a class="jxr_linenumber" name="40" href="#40">40</a>
<a class="jxr_linenumber" name="41" href="#41">41</a> @Inject
<a class="jxr_linenumber" name="42" href="#42">42</a> <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/omid/tso/TSOStateManagerImpl.html">TSOStateManagerImpl</a>(<a href="../../../../org/apache/omid/tso/TimestampOracle.html">TimestampOracle</a> timestampOracle) {
<a class="jxr_linenumber" name="43" href="#43">43</a> <strong class="jxr_keyword">this</strong>.timestampOracle = timestampOracle;
<a class="jxr_linenumber" name="44" href="#44">44</a> }
<a class="jxr_linenumber" name="45" href="#45">45</a>
<a class="jxr_linenumber" name="46" href="#46">46</a> @Override
<a class="jxr_linenumber" name="47" href="#47">47</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">synchronized</strong> <strong class="jxr_keyword">void</strong> register(<a href="../../../../org/apache/omid/tso/TSOStateManager.html">StateObserver</a> newObserver) {
<a class="jxr_linenumber" name="48" href="#48">48</a> Preconditions.checkNotNull(newObserver, <span class="jxr_string">"Trying to register a null observer"</span>);
<a class="jxr_linenumber" name="49" href="#49">49</a> <strong class="jxr_keyword">if</strong> (!stateObservers.contains(newObserver)) {
<a class="jxr_linenumber" name="50" href="#50">50</a> stateObservers.add(newObserver);
<a class="jxr_linenumber" name="51" href="#51">51</a> }
<a class="jxr_linenumber" name="52" href="#52">52</a> }
<a class="jxr_linenumber" name="53" href="#53">53</a>
<a class="jxr_linenumber" name="54" href="#54">54</a> @Override
<a class="jxr_linenumber" name="55" href="#55">55</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">synchronized</strong> <strong class="jxr_keyword">void</strong> unregister(<a href="../../../../org/apache/omid/tso/TSOStateManager.html">StateObserver</a> observer) {
<a class="jxr_linenumber" name="56" href="#56">56</a> stateObservers.remove(observer);
<a class="jxr_linenumber" name="57" href="#57">57</a> }
<a class="jxr_linenumber" name="58" href="#58">58</a>
<a class="jxr_linenumber" name="59" href="#59">59</a> @Override
<a class="jxr_linenumber" name="60" href="#60">60</a> <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/omid/tso/TSOStateManager.html">TSOState</a> initialize() <strong class="jxr_keyword">throws</strong> Exception {
<a class="jxr_linenumber" name="61" href="#61">61</a>
<a class="jxr_linenumber" name="62" href="#62">62</a> LOG.info(<span class="jxr_string">"Initializing TSO Server state..."</span>);
<a class="jxr_linenumber" name="63" href="#63">63</a> <em class="jxr_comment">// The timestamp oracle dictates the new state</em>
<a class="jxr_linenumber" name="64" href="#64">64</a> timestampOracle.initialize();
<a class="jxr_linenumber" name="65" href="#65">65</a> <strong class="jxr_keyword">long</strong> lowWatermark = timestampOracle.getLast();
<a class="jxr_linenumber" name="66" href="#66">66</a> <em class="jxr_comment">// In this implementation the epoch == low watermark</em>
<a class="jxr_linenumber" name="67" href="#67">67</a> <strong class="jxr_keyword">long</strong> epoch = lowWatermark;
<a class="jxr_linenumber" name="68" href="#68">68</a> state = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/omid/tso/TSOStateManager.html">TSOState</a>(lowWatermark, epoch);
<a class="jxr_linenumber" name="69" href="#69">69</a>
<a class="jxr_linenumber" name="70" href="#70">70</a> <em class="jxr_comment">// Then, notify registered observers about the new state</em>
<a class="jxr_linenumber" name="71" href="#71">71</a> <strong class="jxr_keyword">for</strong> (StateObserver stateObserver : stateObservers) {
<a class="jxr_linenumber" name="72" href="#72">72</a> stateObserver.update(state);
<a class="jxr_linenumber" name="73" href="#73">73</a> }
<a class="jxr_linenumber" name="74" href="#74">74</a> LOG.info(<span class="jxr_string">"TSO Server state {}"</span>, state);
<a class="jxr_linenumber" name="75" href="#75">75</a> <strong class="jxr_keyword">return</strong> state;
<a class="jxr_linenumber" name="76" href="#76">76</a>
<a class="jxr_linenumber" name="77" href="#77">77</a> }
<a class="jxr_linenumber" name="78" href="#78">78</a>
<a class="jxr_linenumber" name="79" href="#79">79</a> }
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