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| <div class="subTitle">org.apache.hadoop.hbase.io.hfile.bucket</div> |
| <h2 title="Class BucketCache.RAMCache" class="title">Class BucketCache.RAMCache</h2> |
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| <ul class="inheritance"> |
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| <li>org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.RAMCache</li> |
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| <dd><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">BucketCache</a></dd> |
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| <pre>static class <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.html#line.1564">BucketCache.RAMCache</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">Wrapped the delegate ConcurrentMap with maintaining its block's reference count.</div> |
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| <td class="colFirst"><code>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentHashMap.html?is-external=true" title="class or interface in java.util.concurrent">ConcurrentHashMap</a><<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a>,<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMQueueEntry.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">BucketCache.RAMQueueEntry</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#delegate">delegate</a></span></code> |
| <div class="block">Defined the map as <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentHashMap.html?is-external=true" title="class or interface in java.util.concurrent"><code>ConcurrentHashMap</code></a> explicitly here, because in |
| <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#get-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-"><code>get(BlockCacheKey)</code></a> and |
| <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#putIfAbsent-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.RAMQueueEntry-"><code>putIfAbsent(BlockCacheKey, BucketCache.RAMQueueEntry)</code></a> , we need to |
| guarantee the atomicity of map#computeIfPresent(key, func) and map#putIfAbsent(key, func).</div> |
| </td> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#RAMCache--">RAMCache</a></span>()</code> </td> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#clear--">clear</a></span>()</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#containsKey-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-">containsKey</a></span>(<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a> key)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMQueueEntry.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">BucketCache.RAMQueueEntry</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#get-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-">get</a></span>(<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a> key)</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#isEmpty--">isEmpty</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMQueueEntry.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">BucketCache.RAMQueueEntry</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#putIfAbsent-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.RAMQueueEntry-">putIfAbsent</a></span>(<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a> key, |
| <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMQueueEntry.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">BucketCache.RAMQueueEntry</a> entry)</code> |
| <div class="block">Return the previous associated value, or null if absent.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#remove-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-">remove</a></span>(<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a> key)</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#remove-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-java.util.function.Consumer-">remove</a></span>(<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a> key, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html?is-external=true" title="class or interface in java.util.function">Consumer</a><<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMQueueEntry.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">BucketCache.RAMQueueEntry</a>> action)</code> |
| <div class="block">Defined an <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html?is-external=true" title="class or interface in java.util.function"><code>Consumer</code></a> here, because once the removed entry release its reference count, |
| then it's ByteBuffers may be recycled and accessing it outside this method will be thrown an |
| exception.</div> |
| </td> |
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| <h3>Methods inherited from class java.lang.<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></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
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| <h4>delegate</h4> |
| <pre>final <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentHashMap.html?is-external=true" title="class or interface in java.util.concurrent">ConcurrentHashMap</a><<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a>,<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMQueueEntry.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">BucketCache.RAMQueueEntry</a>> <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#line.1574">delegate</a></pre> |
| <div class="block">Defined the map as <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentHashMap.html?is-external=true" title="class or interface in java.util.concurrent"><code>ConcurrentHashMap</code></a> explicitly here, because in |
| <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#get-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-"><code>get(BlockCacheKey)</code></a> and |
| <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#putIfAbsent-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.RAMQueueEntry-"><code>putIfAbsent(BlockCacheKey, BucketCache.RAMQueueEntry)</code></a> , we need to |
| guarantee the atomicity of map#computeIfPresent(key, func) and map#putIfAbsent(key, func). |
| Besides, the func method can execute exactly once only when the key is present(or absent) |
| and under the lock context. Otherwise, the reference count of block will be messed up. |
| Notice that the <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListMap.html?is-external=true" title="class or interface in java.util.concurrent"><code>ConcurrentSkipListMap</code></a> can not guarantee that.</div> |
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| <h3>Constructor Detail</h3> |
| <a name="RAMCache--"> |
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| <h4>RAMCache</h4> |
| <pre><a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#line.1564">RAMCache</a>()</pre> |
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| <h4>containsKey</h4> |
| <pre>public boolean <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#line.1576">containsKey</a>(<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a> key)</pre> |
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| <h4>get</h4> |
| <pre>public <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMQueueEntry.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">BucketCache.RAMQueueEntry</a> <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#line.1580">get</a>(<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a> key)</pre> |
| </li> |
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| <a name="putIfAbsent-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.RAMQueueEntry-"> |
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| <h4>putIfAbsent</h4> |
| <pre>public <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMQueueEntry.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">BucketCache.RAMQueueEntry</a> <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#line.1594">putIfAbsent</a>(<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a> key, |
| <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMQueueEntry.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">BucketCache.RAMQueueEntry</a> entry)</pre> |
| <div class="block">Return the previous associated value, or null if absent. It has the same meaning as |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentMap.html?is-external=true#putIfAbsent-K-V-" title="class or interface in java.util.concurrent"><code>ConcurrentMap.putIfAbsent(Object, Object)</code></a></div> |
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| <h4>remove</h4> |
| <pre>public boolean <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#line.1605">remove</a>(<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a> key)</pre> |
| </li> |
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| <h4>remove</h4> |
| <pre>public boolean <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#line.1615">remove</a>(<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a> key, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html?is-external=true" title="class or interface in java.util.function">Consumer</a><<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMQueueEntry.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">BucketCache.RAMQueueEntry</a>> action)</pre> |
| <div class="block">Defined an <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html?is-external=true" title="class or interface in java.util.function"><code>Consumer</code></a> here, because once the removed entry release its reference count, |
| then it's ByteBuffers may be recycled and accessing it outside this method will be thrown an |
| exception. the consumer will access entry to remove before release its reference count. |
| Notice, don't change its reference count in the <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html?is-external=true" title="class or interface in java.util.function"><code>Consumer</code></a></div> |
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| <pre>public boolean <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.RAMCache.html#line.1624">isEmpty</a>()</pre> |
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