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| <pre>public abstract class <span class="typeNameLabel">AbstractLruCache</span> |
| extends <a href="AbstractHashMap.html" title="class in com.ibm.dtfj.corereaders.zos.util">AbstractHashMap</a></pre> |
| <div class="block">This class is the superclass of the LRU cache classes. It provides the LRU (Least Recently Used) |
| infrastructure to map integer keys to objects or primitive values. |
| It acts just like a hash map except that once it has reached its maximum size, any further |
| puts will displace the least recently used entry. It uses a doubly linked list to keep track |
| of which entries are most used - an entry is moved to the front of the list every time it |
| is used. Note that the LRU info is lost when the cache is rehashed, but I don't think that's |
| a problem because once the cache reaches its maximum size (and steady state) it will no longer rehash.</div> |
| <dl> |
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| <dd><a href="../../../../../../../serialized-form.html#com.ibm.dtfj.corereaders.zos.util.AbstractLruCache">Serialized Form</a></dd> |
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| <td class="colFirst"><code>protected </code></td> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(int)">AbstractLruCache</a></span>​(int maxSize)</code></th> |
| <td class="colLast"> |
| <div class="block">Create a new AbstractLruCache.</div> |
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| <td class="colFirst"><code>protected int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getIndexAndPromote(long)">getIndexAndPromote</a></span>​(long key)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the index for the value mapped by the given key.</div> |
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| <td class="colFirst"><code>protected int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#putIndexAndPromote(long)">putIndexAndPromote</a></span>​(long key)</code></th> |
| <td class="colLast"> |
| <div class="block">Get the index for a put operation.</div> |
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| <pre>protected AbstractLruCache​(int maxSize)</pre> |
| <div class="block">Create a new AbstractLruCache.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>maxSize</code> - the maximum size the cache can grow to</dd> |
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| <pre class="methodSignature">protected int getIndexAndPromote​(long key)</pre> |
| <div class="block">Returns the index for the value mapped by the given key. Also promotes this key to the most |
| recently used.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the index or -1 if it cannot be found</dd> |
| </dl> |
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| <pre class="methodSignature">protected int putIndexAndPromote​(long key)</pre> |
| <div class="block">Get the index for a put operation. Takes care of promotion and removing the LRU entry |
| if necessary.</div> |
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