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| <h2 title="Class EnvironmentEdgeManager" class="title">Class EnvironmentEdgeManager</h2> |
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| <li>org.apache.hadoop.hbase.util.EnvironmentEdgeManager</li> |
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| <div class="description"> |
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| <br> |
| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/util/EnvironmentEdgeManager.html#line.63">EnvironmentEdgeManager</a> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">Manages a singleton instance of the environment edge. This class shall |
| implement static versions of the interface <a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdge.html" title="interface in org.apache.hadoop.hbase.util"><code>EnvironmentEdge</code></a>, then |
| defer to the delegate on invocation. |
| <br> |
| <b>Original Motivation:</b> |
| The main purpose of the Environment Edge Manager was to have better control |
| over the tests so that they behave the same when run in any system. |
| (Refer: <a href="https://issues.apache.org/jira/browse/HBASE-2578">HBASE-2578</a> - The issue |
| which added the <a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdgeManager.html" title="class in org.apache.hadoop.hbase.util"><code>EnvironmentEdgeManager</code></a>). |
| The idea is to have a central place where time can be assigned in HBase. That makes |
| it easier to inject different implementations of time. The default environment edge is the Java |
| Current Time in millis. The environment edge manager class is designed to be able |
| to plug in a new implementation of time by simply injecting an implementation |
| of <a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdge.html" title="interface in org.apache.hadoop.hbase.util"><code>EnvironmentEdge</code></a> interface to |
| <a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdgeManager.html" title="class in org.apache.hadoop.hbase.util"><code>EnvironmentEdgeManager</code></a> |
| <p> |
| <b>Problems with Environment Edge:</b><br> |
| 1. One of the major problems is the side effects of injecting an Environment Edge into |
| Environment Edge Manager.<br> |
| For example, A test could inject an edge to fast forward time in order to avoid thread |
| sleep to save time, but it could trigger a premature waking up of another thread waiting |
| on a condition dependent on time lapse, which could potentially affect the normal |
| working of the system leading to failure of tests.<br> |
| 2. Every test should ensure it is setting the Environment Edge it needs for the test to |
| perform in an expected way. Because another test which might have run before the current test |
| could have injected its own custom Environment Edge which may not be applicable to this |
| test. This is still solvable but the problem is that the tests can run in parallel |
| leading to different combinations of environment edges being injected causing unexpected |
| results.<br> |
| 3. Another important issue with respect to injecting time through Environment Edge is that |
| the milliseconds unit of time is ingrained throughout the codebase in the form of hardcoded |
| sleep time or timeouts that any change of time unit or making it fast or slow can potentially |
| trigger unexpected failures due to timeout or unintended flow of execution.<br> |
| </p> |
| Because of the above issues, only <a href="../../../../../org/apache/hadoop/hbase/util/DefaultEnvironmentEdge.html" title="class in org.apache.hadoop.hbase.util"><code>DefaultEnvironmentEdge</code></a> |
| is being used, whose implementation of time returns the <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/System.html?is-external=true#currentTimeMillis--" title="class or interface in java.lang"><code>System.currentTimeMillis()</code></a>. It |
| is advised not to inject any other <a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdge.html" title="interface in org.apache.hadoop.hbase.util"><code>EnvironmentEdge</code></a>.</div> |
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| <td class="colFirst"><code>private static <a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdge.html" title="interface in org.apache.hadoop.hbase.util">EnvironmentEdge</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdgeManager.html#delegate">delegate</a></span></code> </td> |
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| <td class="colFirst"><code>private </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdgeManager.html#EnvironmentEdgeManager--">EnvironmentEdgeManager</a></span>()</code> </td> |
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| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdgeManager.html#currentTime--">currentTime</a></span>()</code> |
| <div class="block">Defers to the delegate and calls the |
| <a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdge.html#currentTime--"><code>EnvironmentEdge.currentTime()</code></a> method.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdge.html" title="interface in org.apache.hadoop.hbase.util">EnvironmentEdge</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdgeManager.html#getDelegate--">getDelegate</a></span>()</code> |
| <div class="block">Retrieves the singleton instance of the <a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdge.html" title="interface in org.apache.hadoop.hbase.util"><code>EnvironmentEdge</code></a> that is |
| being managed.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdgeManager.html#injectEdge-org.apache.hadoop.hbase.util.EnvironmentEdge-">injectEdge</a></span>(<a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdge.html" title="interface in org.apache.hadoop.hbase.util">EnvironmentEdge</a> edge)</code> |
| <div class="block">Injects the given edge such that it becomes the managed entity.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdgeManager.html#reset--">reset</a></span>()</code> |
| <div class="block">Resets the managed instance to the default instance: <a href="../../../../../org/apache/hadoop/hbase/util/DefaultEnvironmentEdge.html" title="class in org.apache.hadoop.hbase.util"><code>DefaultEnvironmentEdge</code></a>.</div> |
| </td> |
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| <h4>delegate</h4> |
| <pre>private static volatile <a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdge.html" title="interface in org.apache.hadoop.hbase.util">EnvironmentEdge</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/util/EnvironmentEdgeManager.html#line.64">delegate</a></pre> |
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| <li class="blockList"> |
| <h4>EnvironmentEdgeManager</h4> |
| <pre>private <a href="../../../../../src-html/org/apache/hadoop/hbase/util/EnvironmentEdgeManager.html#line.66">EnvironmentEdgeManager</a>()</pre> |
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| <h4>getDelegate</h4> |
| <pre>public static <a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdge.html" title="interface in org.apache.hadoop.hbase.util">EnvironmentEdge</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/util/EnvironmentEdgeManager.html#line.76">getDelegate</a>()</pre> |
| <div class="block">Retrieves the singleton instance of the <a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdge.html" title="interface in org.apache.hadoop.hbase.util"><code>EnvironmentEdge</code></a> that is |
| being managed.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the edge.</dd> |
| </dl> |
| </li> |
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| <a name="reset--"> |
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| <h4>reset</h4> |
| <pre>public static void <a href="../../../../../src-html/org/apache/hadoop/hbase/util/EnvironmentEdgeManager.html#line.84">reset</a>()</pre> |
| <div class="block">Resets the managed instance to the default instance: <a href="../../../../../org/apache/hadoop/hbase/util/DefaultEnvironmentEdge.html" title="class in org.apache.hadoop.hbase.util"><code>DefaultEnvironmentEdge</code></a>.</div> |
| </li> |
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| <h4>injectEdge</h4> |
| <pre>public static void <a href="../../../../../src-html/org/apache/hadoop/hbase/util/EnvironmentEdgeManager.html#line.94">injectEdge</a>(<a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdge.html" title="interface in org.apache.hadoop.hbase.util">EnvironmentEdge</a> edge)</pre> |
| <div class="block">Injects the given edge such that it becomes the managed entity. If null is |
| passed to this method, the default type is assigned to the delegate.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>edge</code> - the new edge.</dd> |
| </dl> |
| </li> |
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| <a name="currentTime--"> |
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| <h4>currentTime</h4> |
| <pre>public static long <a href="../../../../../src-html/org/apache/hadoop/hbase/util/EnvironmentEdgeManager.html#line.108">currentTime</a>()</pre> |
| <div class="block">Defers to the delegate and calls the |
| <a href="../../../../../org/apache/hadoop/hbase/util/EnvironmentEdge.html#currentTime--"><code>EnvironmentEdge.currentTime()</code></a> method.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>current time in millis according to the delegate.</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
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