Package cn.sliew.milky.common.chain

Class ContextMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.concurrent.ConcurrentHashMap<K,V>

cn.sliew.milky.common.chain.ContextMap<K,V>

Type Parameters:

K - the type of keys maintained by the context associated with this context

V - the type of mapped values

All Implemented Interfaces:

Context<K,V>, Serializable, ConcurrentMap<K,V>, Map<K,V>

public class ContextMap<K,V>
extends ConcurrentHashMap<K,V>
implements Context<K,V>

Convenience base class for Context implementations.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.concurrent.ConcurrentHashMap

ConcurrentHashMap.KeySetView<K extends Object,V extends Object>

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

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

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

Map.Entry<K extends Object,V extends Object>

Field Summary

Fields

Modifier and Type	Field	Description
protected Logger	logger

Constructor Summary

Constructors

Constructor	Description
ContextMap()	Creates a new, empty Context with a default initial capacity, load factor, and concurrencyLevel.
ContextMap(int initialCapacity)	Creates a new, empty Context with the specified initial capacity, and with default load factor and concurrencyLevel
ContextMap(int initialCapacity, float loadFactor, int concurrencyLevel)	Creates a new, empty Context with the specified initial capacity, load factor, and concurrency level.
ContextMap(Logger logger)	Creates a new, empty Context with a default initial capacity, load factor, and concurrencyLevel.
ContextMap(Map<? extends K,? extends V> t)	Creates a new Context with the same mappings as the given map.

Method Summary

Modifier and Type	Method	Description
Logger	logger()	This method provider a Logger utililies for user can't construct a logger or try to log pipeline context message to one logger file.
<T extends V> T	retrieve(K key)	That method enhances the Map.get(Object) method that helps users avoid the redundant code of type cast/checking when assignments are already known.

Methods inherited from class java.util.concurrent.ConcurrentHashMap

clear, compute, computeIfAbsent, computeIfPresent, contains, containsKey, containsValue, elements, entrySet, equals, forEach, forEach, forEach, forEachEntry, forEachEntry, forEachKey, forEachKey, forEachValue, forEachValue, get, getOrDefault, hashCode, isEmpty, keys, keySet, keySet, mappingCount, merge, newKeySet, newKeySet, put, putAll, putIfAbsent, reduce, reduceEntries, reduceEntries, reduceEntriesToDouble, reduceEntriesToInt, reduceEntriesToLong, reduceKeys, reduceKeys, reduceKeysToDouble, reduceKeysToInt, reduceKeysToLong, reduceToDouble, reduceToInt, reduceToLong, reduceValues, reduceValues, reduceValuesToDouble, reduceValuesToInt, reduceValuesToLong, remove, remove, replace, replace, replaceAll, search, searchEntries, searchKeys, searchValues, size, toString, values

Methods inherited from class java.util.AbstractMap

clone

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, put, putAll, remove, size, values

Field Detail

logger

protected Logger logger

Constructor Detail

ContextMap

public ContextMap()

Creates a new, empty Context with a default initial capacity, load factor, and concurrencyLevel.

ContextMap

public ContextMap(Logger logger)

Creates a new, empty Context with a default initial capacity, load factor, and concurrencyLevel.

ContextMap

public ContextMap(int initialCapacity)

Creates a new, empty Context with the specified initial capacity, and with default load factor and concurrencyLevel

Parameters:

initialCapacity - the initial capacity.

ContextMap

public ContextMap(int initialCapacity,
                  float loadFactor,
                  int concurrencyLevel)

Creates a new, empty Context with the specified initial capacity, load factor, and concurrency level.

Parameters:

initialCapacity - the initial capacity.

loadFactor - the load factor threshold, used to control resizing.

concurrencyLevel - the estimated number of concurrently updating threads.

ContextMap

public ContextMap(Map<? extends K,? extends V> t)

Creates a new Context with the same mappings as the given map.

Parameters:

t - Map whose key-value pairs are added

Method Detail

retrieve

public <T extends V> T retrieve(K key)

That method enhances the Map.get(Object) method that helps users avoid the redundant code of type cast/checking when assignments are already known.

It throws ClassCastException if types are not assignable.

Specified by:

retrieve in interface Context<K,V>

Type Parameters:

T - the target assignment type

Parameters:

key - the key whose associated value is to be returned

Returns:

the value to which the specified key is mapped, or null if this map contains no mapping for the key

See Also:

Map.get(Object)

logger

public Logger logger()

Description copied from interface: Context

This method provider a Logger utililies for user can't construct a logger or try to log pipeline context message to one logger file.

Specified by:

logger in interface Context<K,V>

Returns:

logger