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| <div class="sub-title"><span class="module-label-in-type">Module</span> <a href="../../../../../../../module-summary.html">openj9.dtfj</a></div> |
| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">com.ibm.j9ddr.corereaders.tdump.zebedee.util</a></div> |
| <h1 title="Class AbstractLruCache" class="title">Class AbstractLruCache</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link" target="_blank">java.lang.Object</a> |
| <div class="inheritance"><a href="AbstractHashMap.html" title="class in com.ibm.j9ddr.corereaders.tdump.zebedee.util">com.ibm.j9ddr.corereaders.tdump.zebedee.util.AbstractHashMap</a> |
| <div class="inheritance">com.ibm.j9ddr.corereaders.tdump.zebedee.util.AbstractLruCache</div> |
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| <section class="description"> |
| <dl class="notes"> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/io/Serializable.html" title="class or interface in java.io" class="external-link" target="_blank">Serializable</a></code></dd> |
| </dl> |
| <dl class="notes"> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><code><a href="IntegerLruCache.html" title="class in com.ibm.j9ddr.corereaders.tdump.zebedee.util">IntegerLruCache</a></code>, <code><a href="ObjectLruCache.html" title="class in com.ibm.j9ddr.corereaders.tdump.zebedee.util">ObjectLruCache</a></code></dd> |
| </dl> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public abstract class </span><span class="element-name type-name-label">AbstractLruCache</span> |
| <span class="extends-implements">extends <a href="AbstractHashMap.html" title="class in com.ibm.j9ddr.corereaders.tdump.zebedee.util">AbstractHashMap</a></span></div> |
| <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 class="notes"> |
| <dt>See Also:</dt> |
| <dd><a href="../../../../../../../../serialized-form.html#com.ibm.j9ddr.corereaders.tdump.zebedee.util.AbstractLruCache">Serialized Form</a></dd> |
| </dl> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <li> |
| <section class="constructor-summary" id="constructor.summary"> |
| <h2>Constructor Summary</h2> |
| <div class="caption"><span>Constructors</span></div> |
| <div class="summary-table three-column-summary"> |
| <div class="table-header col-first">Modifier</div> |
| <div class="table-header col-second">Constructor</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color"><code>protected </code></div> |
| <div class="col-constructor-name even-row-color"><code><span class="member-name-link"><a href="#%3Cinit%3E(int)">AbstractLruCache</a></span>​(int maxSize)</code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Create a new AbstractLruCache.</div> |
| </div> |
| </div> |
| </section> |
| </li> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li> |
| <section class="method-summary" id="method.summary"> |
| <h2>Method Summary</h2> |
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| <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code>protected int</code></div> |
| <div class="col-second even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><span class="member-name-link"><a href="#getIndexAndPromote(long)">getIndexAndPromote</a></span>​(long key)</code></div> |
| <div class="col-last even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"> |
| <div class="block">Returns the index for the value mapped by the given key.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code>protected int</code></div> |
| <div class="col-second odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><span class="member-name-link"><a href="#putIndexAndPromote(long)">putIndexAndPromote</a></span>​(long key)</code></div> |
| <div class="col-last odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"> |
| <div class="block">Get the index for a put operation.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods.inherited.from.class.com.ibm.j9ddr.corereaders.tdump.zebedee.util.AbstractHashMap">Methods declared in class com.ibm.j9ddr.corereaders.tdump.zebedee.util.<a href="AbstractHashMap.html" title="class in com.ibm.j9ddr.corereaders.tdump.zebedee.util">AbstractHashMap</a></h3> |
| <code><a href="AbstractHashMap.html#getKeys()">getKeys</a>, <a href="AbstractHashMap.html#getKeysArray()">getKeysArray</a>, <a href="AbstractHashMap.html#size()">size</a></code></div> |
| <div class="inherited-list"> |
| <h3 id="methods.inherited.from.class.java.lang.Object">Methods declared in class java.lang.<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link" target="_blank">Object</a></h3> |
| <code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link" target="_blank">clone</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link" target="_blank">equals</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link" target="_blank">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link" target="_blank">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link" target="_blank">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link" target="_blank">notify</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link" target="_blank">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link" target="_blank">toString</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link" target="_blank">wait</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link" target="_blank">wait</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link" target="_blank">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <li> |
| <section class="constructor-details" id="constructor.detail"> |
| <h2>Constructor Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="<init>(int)"> |
| <h3>AbstractLruCache</h3> |
| <div class="member-signature"><span class="modifiers">protected</span> <span class="element-name">AbstractLruCache</span>​<span class="parameters">(int maxSize)</span></div> |
| <div class="block">Create a new AbstractLruCache.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>maxSize</code> - the maximum size the cache can grow to</dd> |
| </dl> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method.detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="getIndexAndPromote(long)"> |
| <h3>getIndexAndPromote</h3> |
| <div class="member-signature"><span class="modifiers">protected</span> <span class="return-type">int</span> <span class="element-name">getIndexAndPromote</span>​<span class="parameters">(long key)</span></div> |
| <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 class="notes"> |
| <dt>Returns:</dt> |
| <dd>the index or -1 if it cannot be found</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="putIndexAndPromote(long)"> |
| <h3>putIndexAndPromote</h3> |
| <div class="member-signature"><span class="modifiers">protected</span> <span class="return-type">int</span> <span class="element-name">putIndexAndPromote</span>​<span class="parameters">(long key)</span></div> |
| <div class="block">Get the index for a put operation. Takes care of promotion and removing the LRU entry |
| if necessary.</div> |
| </section> |
| </li> |
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