PersistentMap (Jadex Active Component Platform 3.0.86 API)

java.lang.Object
- jadex.commons.collection.PersistentMap<K,V>

All Implemented Interfaces:

java.util.Map<K,V>
```
public class PersistentMap<K,V>
extends java.lang.Object
implements java.util.Map<K,V>
```
A map implementation supporting automatic serialization its data and persisting it on disk.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`protected static class`	`PersistentMap.DeletedKey` Marker for deleted entries.
`protected class`	`PersistentMap.ValueInfo` Information about a stored value.

Nested classes/interfaces inherited from interface java.util.Map
java.util.Map.Entry<K,V>

Field Summary

Fields
Modifier and Type	Field and Description
`protected long`	`autocompactionthreshold` Dirty threshold for auto-compaction.
`protected java.lang.ClassLoader`	`classloader` Class loader used for serialization.
`protected long`	`dirtybytes` Bytes of dirty entries.
`protected java.io.File`	`file` The persistence file.
`protected java.util.Map<K,PersistentMap.ValueInfo>`	`indexmap` The index map, key to position and size of value.
`protected java.lang.String`	`mode` The file access mode.
`protected java.io.OutputStream`	`pfilestream`
`protected java.io.RandomAccessFile`	`raf` Random access to the persistence file

Constructor Summary

Constructors
Constructor and Description

PersistentMap(java.io.File file, boolean synchronous, java.lang.ClassLoader classloader)
Creates the map.

Constructors
Constructor and Description
`PersistentMap(java.io.File file, boolean synchronous, java.lang.ClassLoader classloader)` Creates the map.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`protected void`	`buildIndex()` Builds the index.
`void`	`clear()` Removes all of the entries from this map.
`void`	`close()` Closes the persistence file.
`void`	`compact()` Removes stale entries and compacts the map.
`boolean`	`containsKey(java.lang.Object key)` Returns whether this map contains the specified key.
`boolean`	`containsValue(java.lang.Object value)` Returns whether the map contains the specified value.
`protected V`	`doPut(K key, V value)` Commits a value to the map
`V`	`doRemove(java.lang.Object key)`
`java.util.Set<java.util.Map.Entry<K,V>>`	`entrySet()` Returns the map's entry set.
`V`	`get(java.lang.Object key)` Returns the value for a specified key.
`long`	`getDirtyBytes()` Returns the bytes wasted due to stale entries.
`boolean`	`isEmpty()` Returns whether this map is empty.
`java.util.Set<K>`	`keySet()` Returns the keys of the map.
`static void`	`main(java.lang.String[] args)` Test main method.
`V`	`put(K key, V value)` Puts a new value in the map.
`void`	`putAll(java.util.Map<? extends K,? extends V> m)` Copies entries from the specified map to this map,
`V`	`remove(java.lang.Object key)` Removes a map entry.
`void`	`setAutoCompactionThreshold(long threshold)` Sets the threshold of stale bytes before auto-compaction is executed.
`int`	`size()` Returns the size of the map.
`java.util.Collection<V>`	`values()` Returns the values of the map.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, equals, forEach, getOrDefault, hashCode, merge, putIfAbsent, remove, replace, replace, replaceAll

- Field Detail
  - indexmap
```
protected java.util.Map<K,PersistentMap.ValueInfo> indexmap
```
    The index map, key to position and size of value.
  - file
```
protected java.io.File file
```
    The persistence file.
  - mode
```
protected java.lang.String mode
```
    The file access mode.
  - raf
```
protected java.io.RandomAccessFile raf
```
    Random access to the persistence file
  - pfilestream
```
protected java.io.OutputStream pfilestream
```
  - dirtybytes
```
protected long dirtybytes
```
    Bytes of dirty entries.
  - autocompactionthreshold
```
protected long autocompactionthreshold
```
    Dirty threshold for auto-compaction.
  - classloader
```
protected java.lang.ClassLoader classloader
```
    Class loader used for serialization.
- Constructor Detail
  - PersistentMap
```
public PersistentMap(java.io.File file,
                     boolean synchronous,
                     java.lang.ClassLoader classloader)
```
    Creates the map.
    
    Parameters:
    
    file - File used for persistent data.
- Method Detail
  - main
```
public static void main(java.lang.String[] args)
```
    Test main method.
    
    Parameters:
    
    args - Arguments.
  - size
```
public int size()
```
    Returns the size of the map.
    
    Specified by:
    
    size in interface java.util.Map<K,V>
  - isEmpty
```
public boolean isEmpty()
```
    Returns whether this map is empty.
    
    Specified by:
    
    isEmpty in interface java.util.Map<K,V>
  - containsKey
```
public boolean containsKey(java.lang.Object key)
```
    Returns whether this map contains the specified key.
    
    Specified by:
    
    containsKey in interface java.util.Map<K,V>
  - containsValue
```
public boolean containsValue(java.lang.Object value)
```
    Returns whether the map contains the specified value. NOTE: This is very slow, use with caution.
    
    Specified by:
    
    containsValue in interface java.util.Map<K,V>
  - get
```
public V get(java.lang.Object key)
```
    Returns the value for a specified key.
    
    Specified by:
    
    get in interface java.util.Map<K,V>
  - put
```
public V put(K key,
             V value)
```
    Puts a new value in the map.
    
    Specified by:
    
    put in interface java.util.Map<K,V>
  - remove
```
public V remove(java.lang.Object key)
```
    Removes a map entry.
    
    Specified by:
    
    remove in interface java.util.Map<K,V>
  - putAll
```
public void putAll(java.util.Map<? extends K,? extends V> m)
```
    Copies entries from the specified map to this map,
    
    Specified by:
    
    putAll in interface java.util.Map<K,V>
  - clear
```
public void clear()
```
    Removes all of the entries from this map.
    
    Specified by:
    
    clear in interface java.util.Map<K,V>
  - keySet
```
public java.util.Set<K> keySet()
```
    Returns the keys of the map. Note: Unlike other maps, this is the preferred (fastest mode) for iteration.
    
    Specified by:
    
    keySet in interface java.util.Map<K,V>
  - values
```
public java.util.Collection<V> values()
```
    Returns the values of the map. NOTE: This is very slow, use with caution.
    
    Specified by:
    
    values in interface java.util.Map<K,V>
  - entrySet
```
public java.util.Set<java.util.Map.Entry<K,V>> entrySet()
```
    Returns the map's entry set. Warning: SLOW!
    
    Specified by:
    
    entrySet in interface java.util.Map<K,V>
  - compact
```
public void compact()
```
    Removes stale entries and compacts the map.
  - close
```
public void close()
```
    Closes the persistence file. The map ceases to function after calling this.
  - getDirtyBytes
```
public long getDirtyBytes()
```
    Returns the bytes wasted due to stale entries.
  - setAutoCompactionThreshold
```
public void setAutoCompactionThreshold(long threshold)
```
    Sets the threshold of stale bytes before auto-compaction is executed. Setting the threshold to Long.MAX_VALUE disables auto-compaction.
  - buildIndex
```
protected void buildIndex()
```
    Builds the index.
  - doPut
```
protected V doPut(K key,
                  V value)
```
    Commits a value to the map
  - doRemove
```
public V doRemove(java.lang.Object key)
```

Class PersistentMap<K,V>

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Map

Field Detail

indexmap

file

mode

raf

pfilestream

dirtybytes

autocompactionthreshold

classloader

Constructor Detail

PersistentMap

Method Detail

main

size

isEmpty

containsKey

containsValue

get

put

remove

putAll

clear

keySet

values

entrySet

compact

close

getDirtyBytes

setAutoCompactionThreshold

buildIndex

doPut

doRemove