aQute.lib.persistentmap

Class PersistentMap<V>

java.lang.Object

java.util.AbstractMap<String,V>

aQute.lib.persistentmap.PersistentMap<V>

All Implemented Interfaces:

Closeable, AutoCloseable, Map<String,V>

public class PersistentMap<V>
extends AbstractMap<String,V>
implements Closeable

Implements a low performance but easy to use map that is backed on a directory. All objects are stored as JSON objects and therefore should be DTOs. Each key is a file name and the contents is the value encoded in JSON. The PersistentMap will attempt to lock the directory. This is a non-concurrent implementation so you must ensure it is only used in a single thread. It cannot of course also not share the data directory.

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

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

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
PersistentMap(File dir, Class<V> type)
PersistentMap(File dir, Class<V> type, Map<String,V> map)
PersistentMap(File dir, Type type)
PersistentMap(File dir, Type type, Map<String,V> map)

Method Summary

Modifier and Type	Method and Description
void	clear()
void	clear(long whenOlder)
void	close()
Set<Map.Entry<String,V>>	entrySet()
Set<String>	keySet()
V	put(String key, V value)
V	remove(String key)
String	toString()

Methods inherited from class java.util.AbstractMap

clone, containsKey, containsValue, equals, get, hashCode, isEmpty, putAll, remove, size, values

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Constructor Detail

PersistentMap

public PersistentMap(File dir,
                     Type type)
              throws Exception

Throws:

Exception

PersistentMap

public PersistentMap(File dir,
                     Class<V> type)
              throws Exception

Throws:

Exception

PersistentMap

public PersistentMap(File dir,
                     Class<V> type,
                     Map<String,V> map)
              throws Exception

Throws:

Exception

PersistentMap

public PersistentMap(File dir,
                     Type type,
                     Map<String,V> map)
              throws Exception

Throws:

Exception

Method Detail

entrySet

public Set<Map.Entry<String,V>> entrySet()

Specified by:

entrySet in interface Map<String,V>

Specified by:

entrySet in class AbstractMap<String,V>

put

public V put(String key,
             V value)

Specified by:

put in interface Map<String,V>

Overrides:

put in class AbstractMap<String,V>

remove

public V remove(String key)

clear

public void clear()

Specified by:

clear in interface Map<String,V>

Overrides:

clear in class AbstractMap<String,V>

keySet

public Set<String> keySet()

Specified by:

keySet in interface Map<String,V>

Overrides:

keySet in class AbstractMap<String,V>

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException

toString

public String toString()

Overrides:

toString in class AbstractMap<String,V>

clear

public void clear(long whenOlder)