Package org.apache.logging.log4j.spi

Class GarbageFreeSortedArrayThreadContextMap

java.lang.Object

org.apache.logging.log4j.spi.GarbageFreeSortedArrayThreadContextMap

All Implemented Interfaces:

CleanableThreadContextMap, ObjectThreadContextMap, ReadOnlyThreadContextMap, ThreadContextMap, ThreadContextMap2

class GarbageFreeSortedArrayThreadContextMap
extends java.lang.Object
implements ReadOnlyThreadContextMap, ObjectThreadContextMap

SortedArrayStringMap-based implementation of the ThreadContextMap interface that attempts not to create temporary objects. Adding and removing key-value pairs will not create temporary objects.

This implementation does not make a copy of its contents on every operation, so this data structure cannot be passed to log events. Instead, client code needs to copy the contents when interacting with another thread.

Since:

2.7

Field Summary

Fields

Modifier and Type	Field	Description
protected static int	DEFAULT_INITIAL_CAPACITY	The default initial capacity.
static java.lang.String	INHERITABLE_MAP	Property name ("isThreadContextMapInheritable" ) for selecting InheritableThreadLocal (value "true") or plain ThreadLocal (value is not "true") in the implementation.
private static boolean	inheritableMap
private static int	initialCapacity
protected java.lang.ThreadLocal<StringMap>	localMap
protected static java.lang.String	PROPERTY_NAME_INITIAL_CAPACITY	System property name that can be used to control the data structure's initial capacity.

Constructor Summary

Constructors

Constructor	Description
GarbageFreeSortedArrayThreadContextMap()

Method Summary

Modifier and Type	Method	Description
void	clear()	Clears the context.
boolean	containsKey(java.lang.String key)	Determines if the key is in the context.
protected StringMap	createStringMap()	Returns an implementation of the StringMap used to back this thread context map.
protected StringMap	createStringMap(ReadOnlyStringMap original)	Returns an implementation of the StringMap used to back this thread context map, pre-populated with the contents of the specified context data.
private java.lang.ThreadLocal<StringMap>	createThreadLocalMap()
boolean	equals(java.lang.Object obj)
java.lang.String	get(java.lang.String key)	Gets the context identified by the key parameter.
java.util.Map<java.lang.String,java.lang.String>	getCopy()	Gets a non-null mutable copy of current thread's context Map.
java.util.Map<java.lang.String,java.lang.String>	getImmutableMapOrNull()	Returns an immutable view on the context Map or null if the context map is empty.
StringMap	getReadOnlyContextData()	Returns the context data for reading.
private StringMap	getThreadLocalMap()
<V> V	getValue(java.lang.String key)	Returns the Object value for the specified key, or null if the specified key does not exist in this collection.
int	hashCode()
(package private) static void	init()	Initializes static variables based on system properties.
boolean	isEmpty()	Returns true if the Map is empty.
void	put(java.lang.String key, java.lang.String value)	Puts a context value (the o parameter) as identified with the key parameter into the current thread's context map.
void	putAll(java.util.Map<java.lang.String,java.lang.String> values)	Puts all given context map entries into the current thread's context map.
<V> void	putAllValues(java.util.Map<java.lang.String,V> values)	Puts all given key-value pairs into the collection.
void	putValue(java.lang.String key, java.lang.Object value)	Puts the specified key-value pair into the collection.
void	remove(java.lang.String key)	Removes the context identified by the key parameter.
void	removeAll(java.lang.Iterable<java.lang.String> keys)	Removes all given context map keys from the current thread's context map.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

INHERITABLE_MAP

public static final java.lang.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

DEFAULT_INITIAL_CAPACITY

protected static final int DEFAULT_INITIAL_CAPACITY

The default initial capacity.

See Also:

Constant Field Values

PROPERTY_NAME_INITIAL_CAPACITY

protected static final java.lang.String PROPERTY_NAME_INITIAL_CAPACITY

System property name that can be used to control the data structure's initial capacity.

See Also:

Constant Field Values

localMap

protected final java.lang.ThreadLocal<StringMap> localMap

initialCapacity

private static volatile int initialCapacity

inheritableMap

private static volatile boolean inheritableMap

Constructor Detail

GarbageFreeSortedArrayThreadContextMap

public GarbageFreeSortedArrayThreadContextMap()

Method Detail

init

static void init()

Initializes static variables based on system properties. Normally called when this class is initialized by the VM and when Log4j is reconfigured.

createThreadLocalMap

private java.lang.ThreadLocal<StringMap> createThreadLocalMap()

createStringMap

protected StringMap createStringMap()

Returns an implementation of the StringMap used to back this thread context map.

Subclasses may override.

Returns:

an implementation of the StringMap used to back this thread context map

createStringMap

protected StringMap createStringMap(ReadOnlyStringMap original)

Returns an implementation of the StringMap used to back this thread context map, pre-populated with the contents of the specified context data.

Subclasses may override.

Parameters:

original - the key-value pairs to initialize the returned context data with

Returns:

an implementation of the StringMap used to back this thread context map

getThreadLocalMap

private StringMap getThreadLocalMap()

put

public void put(java.lang.String key,
                java.lang.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.

putValue

public void putValue(java.lang.String key,
                     java.lang.Object value)

Description copied from interface: ObjectThreadContextMap

Puts the specified key-value pair into the collection.

Specified by:

putValue in interface ObjectThreadContextMap

Parameters:

key - the key to add or remove. Keys may be null.

value - the value to add. Values may be null.

putAll

public void putAll(java.util.Map<java.lang.String,java.lang.String> values)

Description copied from interface: ThreadContextMap2

Puts all given context map entries 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:

putAll in interface ThreadContextMap2

Parameters:

values - The map.

putAllValues

public <V> void putAllValues(java.util.Map<java.lang.String,V> values)

Description copied from interface: ObjectThreadContextMap

Puts all given key-value pairs into the collection.

Specified by:

putAllValues in interface ObjectThreadContextMap

Parameters:

values - the map of key-value pairs to add

get

public java.lang.String get(java.lang.String key)

Description copied from interface: ReadOnlyThreadContextMap

Gets the context identified by the key parameter.

This method has no side effects.

Specified by:

get in interface ReadOnlyThreadContextMap

Specified by:

get in interface ThreadContextMap

Parameters:

key - The key to locate.

Returns:

The value associated with the key or null.

getValue

public <V> V getValue(java.lang.String key)

Description copied from interface: ObjectThreadContextMap

Returns the Object value for the specified key, or null if the specified key does not exist in this collection.

Specified by:

getValue in interface ObjectThreadContextMap

Parameters:

key - the key whose value to return

Returns:

the value for the specified key or null

remove

public void remove(java.lang.String key)

Description copied from interface: ThreadContextMap

Removes the context identified by the key parameter.

Specified by:

remove in interface ThreadContextMap

Parameters:

key - The key to remove.

removeAll

public void removeAll(java.lang.Iterable<java.lang.String> keys)

Description copied from interface: CleanableThreadContextMap

Removes all given context map keys from 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:

removeAll in interface CleanableThreadContextMap

Parameters:

keys - The keys.

clear

public void clear()

Description copied from interface: ReadOnlyThreadContextMap

Clears the context.

Specified by:

clear in interface ReadOnlyThreadContextMap

Specified by:

clear in interface ThreadContextMap

containsKey

public boolean containsKey(java.lang.String key)

Description copied from interface: ReadOnlyThreadContextMap

Determines if the key is in the context.

Specified by:

containsKey in interface ReadOnlyThreadContextMap

Specified by:

containsKey in interface ThreadContextMap

Parameters:

key - The key to locate.

Returns:

True if the key is in the context, false otherwise.

getCopy

public java.util.Map<java.lang.String,java.lang.String> getCopy()

Description copied from interface: ReadOnlyThreadContextMap

Gets a non-null mutable copy of current thread's context Map.

Specified by:

getCopy in interface ReadOnlyThreadContextMap

Specified by:

getCopy in interface ThreadContextMap

Returns:

a mutable copy of the context.

getReadOnlyContextData

public StringMap getReadOnlyContextData()

Returns the context data for reading. Note that regardless of whether the returned context data has been frozen (made read-only) or not, callers should not attempt to modify the returned data structure.

Thread safety note:

If this ReadOnlyThreadContextMap implements CopyOnWrite, then the returned StringMap can safely be passed to another thread: future changes in the underlying context data will not be reflected in the returned StringMap.

Otherwise, if this ReadOnlyThreadContextMap does not implement CopyOnWrite, then it is not safe to pass the returned StringMap to another thread because changes in the underlying context may be reflected in the returned object. It is the responsibility of the caller to make a copy to pass to another thread.

Specified by:

getReadOnlyContextData in interface ReadOnlyThreadContextMap

Specified by:

getReadOnlyContextData in interface ThreadContextMap2

Returns:

a StringMap containing context data key-value pairs

getImmutableMapOrNull

public java.util.Map<java.lang.String,java.lang.String> getImmutableMapOrNull()

Description copied from interface: ReadOnlyThreadContextMap

Returns an immutable view on the context Map or null if the context map is empty.

Specified by:

getImmutableMapOrNull in interface ReadOnlyThreadContextMap

Specified by:

getImmutableMapOrNull in interface ThreadContextMap

Returns:

an immutable context Map or null.

isEmpty

public boolean isEmpty()

Description copied from interface: ReadOnlyThreadContextMap

Returns true if the Map is empty.

Specified by:

isEmpty in interface ReadOnlyThreadContextMap

Specified by:

isEmpty in interface ThreadContextMap

Returns:

true if the Map is empty, false otherwise.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object