DefaultThreadContextMap (Apache Log4j API 2.12.0 API)

java.lang.Object
- org.apache.logging.log4j.spi.DefaultThreadContextMap

All Implemented Interfaces:

Serializable, ThreadContextMap, ReadOnlyStringMap
```
public class DefaultThreadContextMap
extends Object
implements ThreadContextMap, ReadOnlyStringMap
```
The actual ThreadContext Map. A new ThreadContext Map is created each time it is updated and the Map stored is always immutable. This means the Map can be passed to other threads without concern that it will be updated. Since it is expected that the Map will be passed to many more log events than the number of keys it contains the performance should be much better than if the Map was copied for each event.

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`INHERITABLE_MAP` Property name ("isThreadContextMapInheritable" ) for selecting `InheritableThreadLocal` (value "true") or plain `ThreadLocal` (value is not "true") in the implementation.

Constructor Summary

Constructors
Constructor and Description

DefaultThreadContextMap()

DefaultThreadContextMap(boolean useMap)

Constructors
Constructor and Description
`DefaultThreadContextMap()`
`DefaultThreadContextMap(boolean useMap)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`clear()` Clears the context.
`boolean`	`containsKey(String key)` Determines if the key is in the context.
`boolean`	`equals(Object obj)`
`<V> void`	`forEach(BiConsumer<String,? super V> action)` Performs the given action for each key-value pair in this data structure until all entries have been processed or the action throws an exception.
`<V,S> void`	`forEach(TriConsumer<String,? super V,S> action, S state)` Performs the given action for each key-value pair in this data structure until all entries have been processed or the action throws an exception.
`String`	`get(String key)` Gets the context identified by the `key` parameter.
`Map<String,String>`	`getCopy()` Gets a non-`null` mutable copy of current thread's context Map.
`Map<String,String>`	`getImmutableMapOrNull()` Returns an immutable view on the context Map or `null` if the context map is empty.
`<V> V`	`getValue(String key)` Returns the value for the specified key, or `null` if the specified key does not exist in this collection.
`int`	`hashCode()`
`boolean`	`isEmpty()` Returns true if the Map is empty.
`void`	`put(String key, String value)` Puts a context value (the `o` parameter) as identified with the `key` parameter into the current thread's context map.
`void`	`putAll(Map<String,String> m)`
`void`	`remove(String key)` Removes the the context identified by the `key` parameter.
`void`	`removeAll(Iterable<String> keys)`
`int`	`size()` Returns the number of key-value pairs in this collection.
`Map<String,String>`	`toMap()` Returns a non-`null` mutable `Map<String, String>` containing a snapshot of this data structure.
`String`	`toString()`

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

- Field Detail
  - INHERITABLE_MAP
```
public static final String INHERITABLE_MAP
```
    Property name ("isThreadContextMapInheritable" ) for selecting InheritableThreadLocal (value "true") or plain ThreadLocal (value is not "true") in the implementation.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - DefaultThreadContextMap
```
public DefaultThreadContextMap()
```
  - DefaultThreadContextMap
```
public DefaultThreadContextMap(boolean useMap)
```
- Method Detail
  - put
```
public void put(String key,
                String value)
```
    Description copied from interface: ThreadContextMap
    
    Puts a context value (the o parameter) as identified with the key parameter into the current thread's context map.
    If the current thread does not have a context map it is created as a side effect.
    
    Specified by:
    
    put in interface ThreadContextMap
    
    Parameters:
    
    key - The key name.
    
    value - The key value.
  - putAll
```
public void putAll(Map<String,String> m)
```
  - get
```
public String get(String key)
```
    Description copied from interface: ThreadContextMap
    
    Gets the context identified by the key parameter.
    This method has no side effects.
    
    Specified by:
    
    get in interface ThreadContextMap
    
    Parameters:
    
    key - The key to locate.
    
    Returns:
    
    The value associated with the key or null.
  - remove
```
public void remove(String key)
```
    Description copied from interface: ThreadContextMap
    
    Removes the the context identified by the key parameter.
    
    Specified by:
    
    remove in interface ThreadContextMap
    
    Parameters:
    
    key - The key to remove.
  - removeAll
```
public void removeAll(Iterable<String> keys)
```
  - clear
```
public void clear()
```
    Description copied from interface: ThreadContextMap
    
    Clears the context.
    
    Specified by:
    
    clear in interface ThreadContextMap
  - toMap
```
public Map<String,String> toMap()
```
    Description copied from interface: ReadOnlyStringMap
    
    Returns a non-null mutable Map<String, String> containing a snapshot of this data structure.
    
    Specified by:
    
    toMap in interface ReadOnlyStringMap
    
    Returns:
    
    a mutable copy of this data structure in Map<String, String> form.
  - containsKey
```
public boolean containsKey(String key)
```
    Description copied from interface: ThreadContextMap
    
    Determines if the key is in the context.
    
    Specified by:
    
    containsKey in interface ThreadContextMap
    
    Specified by:
    
    containsKey in interface ReadOnlyStringMap
    
    Parameters:
    
    key - The key to locate.
    
    Returns:
    
    True if the key is in the context, false otherwise.
  - forEach
```
public <V> void forEach(BiConsumer<String,? super V> action)
```
    Description copied from interface: ReadOnlyStringMap
    
    Performs the given action for each key-value pair in this data structure until all entries have been processed or the action throws an exception.
    Some implementations may not support structural modifications (adding new elements or removing elements) while iterating over the contents. In such implementations, attempts to add or remove elements from the BiConsumer's BiConsumer.accept(Object, Object) accept} method may cause a ConcurrentModificationException to be thrown.
    
    Specified by:
    
    forEach in interface ReadOnlyStringMap
    
    Type Parameters:
    
    V - type of the value.
    
    Parameters:
    
    action - The action to be performed for each key-value pair in this collection.
  - forEach
```
public <V,S> void forEach(TriConsumer<String,? super V,S> action,
                          S state)
```
    Description copied from interface: ReadOnlyStringMap
    
    Performs the given action for each key-value pair in this data structure until all entries have been processed or the action throws an exception.
    The third parameter lets callers pass in a stateful object to be modified with the key-value pairs, so the TriConsumer implementation itself can be stateless and potentially reusable.
    
    Some implementations may not support structural modifications (adding new elements or removing elements) while iterating over the contents. In such implementations, attempts to add or remove elements from the TriConsumer's accept method may cause a ConcurrentModificationException to be thrown.
    
    Specified by:
    
    forEach in interface ReadOnlyStringMap
    
    Type Parameters:
    
    V - type of the value.
    
    S - type of the third parameter.
    
    Parameters:
    
    action - The action to be performed for each key-value pair in this collection.
    
    state - the object to be passed as the third parameter to each invocation on the specified triconsumer.
  - getValue
```
public <V> V getValue(String key)
```
    Description copied from interface: ReadOnlyStringMap
    
    Returns the value for the specified key, or null if the specified key does not exist in this collection.
    
    Specified by:
    
    getValue in interface ReadOnlyStringMap
    
    Parameters:
    
    key - the key whose value to return.
    
    Returns:
    
    the value for the specified key or null.
  - getCopy
```
public Map<String,String> getCopy()
```
    Description copied from interface: ThreadContextMap
    
    Gets a non-null mutable copy of current thread's context Map.
    
    Specified by:
    
    getCopy in interface ThreadContextMap
    
    Returns:
    
    a mutable copy of the context.
  - getImmutableMapOrNull
```
public Map<String,String> getImmutableMapOrNull()
```
    Description copied from interface: ThreadContextMap
    
    Returns an immutable view on the context Map or null if the context map is empty.
    
    Specified by:
    
    getImmutableMapOrNull in interface ThreadContextMap
    
    Returns:
    
    an immutable context Map or null.
  - isEmpty
```
public boolean isEmpty()
```
    Description copied from interface: ThreadContextMap
    
    Returns true if the Map is empty.
    
    Specified by:
    
    isEmpty in interface ThreadContextMap
    
    Specified by:
    
    isEmpty in interface ReadOnlyStringMap
    
    Returns:
    
    true if the Map is empty, false otherwise.
  - size
```
public int size()
```
    Description copied from interface: ReadOnlyStringMap
    
    Returns the number of key-value pairs in this collection.
    
    Specified by:
    
    size in interface ReadOnlyStringMap
    
    Returns:
    
    the number of key-value pairs in this collection.
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - equals
```
public boolean equals(Object obj)
```
    Overrides:
    
    equals in class Object

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Class DefaultThreadContextMap

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

INHERITABLE_MAP

Constructor Detail

DefaultThreadContextMap

DefaultThreadContextMap

Method Detail

put

putAll

get

remove

removeAll

clear

toMap

containsKey

forEach

forEach

getValue

getCopy

getImmutableMapOrNull

isEmpty

size

toString

hashCode

equals