JDBCStatementCache.BoundedLinkedHashMap (Apache Derby V10.14 Internals)

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Summary:
Nested |
Field |
Constr |
Method

Detail:
Field |
Constr |
Method

java.lang.Object
- java.util.AbstractMap<K,V>
- - java.util.HashMap<K,V>
  - - java.util.LinkedHashMap<StatementKey,java.sql.PreparedStatement>
    - - org.apache.derby.client.am.stmtcache.JDBCStatementCache.BoundedLinkedHashMap

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.util.Map<StatementKey,java.sql.PreparedStatement>

Enclosing class:

JDBCStatementCache
```
private static class JDBCStatementCache.BoundedLinkedHashMap
extends java.util.LinkedHashMap<StatementKey,java.sql.PreparedStatement>
```
A LinkedHashMap with an upper bound on the number of entries.
If the maximum size is exceeded, the oldest entry is automatically removed after the new entry has been inserted.

Nested Class Summary
- Nested classes/interfaces inherited from class java.util.AbstractMap
  java.util.AbstractMap.SimpleEntry<K extends java.lang.Object,V extends java.lang.Object>, java.util.AbstractMap.SimpleImmutableEntry<K extends java.lang.Object,V extends java.lang.Object>

Field Summary

Fields
Modifier and Type Field Description

private int maxSize
Maximum number of entries.

Constructor Summary

Constructors
Constructor Description

BoundedLinkedHashMap(int maxCapacity)
Creates a bounded LinkedHashMap with the specified maximum size.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected boolean`	`removeEldestEntry(java.util.Map.Entry<StatementKey,java.sql.PreparedStatement> eldest)`	Tells if an entry should be removed from the map.

Methods inherited from class java.util.AbstractMap
equals, hashCode, toString

Methods inherited from class java.util.HashMap
clone, compute, computeIfAbsent, computeIfPresent, containsKey, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, size

Methods inherited from class java.util.LinkedHashMap
clear, containsValue, entrySet, forEach, get, getOrDefault, keySet, replaceAll, values

Methods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, containsKey, equals, hashCode, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, size

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - maxSize
```
private final int maxSize
```
    Maximum number of entries.
- Constructor Detail
  - BoundedLinkedHashMap
```
public BoundedLinkedHashMap(int maxCapacity)
```
    Creates a bounded LinkedHashMap with the specified maximum size.
    Iteration is by insertion-order.
    
    Parameters:
    
    maxCapacity - maximum size of the map
- Method Detail
  - removeEldestEntry
```
protected boolean removeEldestEntry(java.util.Map.Entry<StatementKey,java.sql.PreparedStatement> eldest)
```
    Tells if an entry should be removed from the map.
    If the cache has exceeded its maximum size, the oldest element will be marked for removal. The oldest element will be removed after the new element has been inserted.
    
    Overrides:
    
    removeEldestEntry in class java.util.LinkedHashMap<StatementKey,java.sql.PreparedStatement>
    
    Parameters:
    
    eldest - the element picked out for removal
    
    Returns:
    
    true if the element is to be removed, false if not.

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Built on Wed 2018-05-16 16:01:03+0000, from revision ???

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Apache Derby V10.14 Internals - Copyright © 2004,2018 The Apache Software Foundation. All Rights Reserved.