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com.tangosol.net.cache
Class CacheStoreMap.ReadWriteMap

java.lang.Object
com.tangosol.util.Base
com.tangosol.util.AbstractKeyBasedMap
com.tangosol.net.cache.CacheStoreMap.ReadWriteMap

All Implemented Interfaces:

java.util.Map

Enclosing class:

CacheStoreMap

public static class CacheStoreMap.ReadWriteMap

extends AbstractKeyBasedMap

A Map implementation that delegates straight through to a CacheStore.

Nested Class Summary

Nested classes/interfaces inherited from class com.tangosol.util.AbstractKeyBasedMap

AbstractKeyBasedMap.EntrySet, AbstractKeyBasedMap.KeySet, AbstractKeyBasedMap.ValuesCollection

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

java.util.Map.Entry

Field Summary

protected boolean	m_fBlind True means that put() and remove() can return null, regardless of the presence of an old value.
protected boolean	m_fEraseUnsupported True means that a call to the CacheStore erase() method is assumed to be unsupported.
protected boolean	m_fStoreUnsupported True means that a call to the CacheStore store() method is assumed to be unsupported.
protected CacheStore	m_store The CacheStore to delegate all Map operations to.

Constructor Summary

CacheStoreMap.ReadWriteMap(CacheStore store, boolean fBlind)
Construct a read/write CacheStoreMap.

Method Summary

void	clear() Clear is explicitly not implemented.
boolean	containsKey(java.lang.Object oKey) Returns true if this map contains a mapping for the specified key.
java.lang.Object	get(java.lang.Object oKey) Returns the value to which this map maps the specified key.
java.util.Map	getAll(java.util.Collection colKeys) Get all the specified keys, if they are in the Map.
protected boolean	isBlindPutAllowed() Determine if the "blind put" optimization is possible.
protected boolean	isBlindRemoveAllowed() Determine if the "blind remove" optimization is possible.
protected boolean	isEraseUnsupported() Determine if the CacheStore has been determined to be read-only for erase() operations.
protected boolean	isStoreUnsupported() Determine if the CacheStore has been determined to be read-only for store() operations.
protected java.util.Iterator	iterateKeys() Create an iterator over the keys in this Map.
java.lang.Object	put(java.lang.Object oKey, java.lang.Object oValue) Associates the specified value with the specified key in this map.
void	putAll(java.util.Map map) Copies all of the mappings from the specified map to this map.
java.lang.Object	remove(java.lang.Object oKey) Removes the mapping for this key from this map if present.
protected boolean	removeBlind(java.lang.Object oKey) Removes the mapping for this key from this map if present.

Methods inherited from class com.tangosol.util.AbstractKeyBasedMap

clone, containsValue, entrySet, equals, hashCode, instantiateEntrySet, instantiateKeySet, instantiateValues, isEmpty, keySet, size, toString, values

Field Detail

m_store

protected CacheStore m_store

The CacheStore to delegate all Map operations to.

m_fBlind

protected boolean m_fBlind

True means that put() and remove() can return null, regardless of the presence of an old value.

m_fStoreUnsupported

protected boolean m_fStoreUnsupported

True means that a call to the CacheStore store() method is assumed to be unsupported.

m_fEraseUnsupported

protected boolean m_fEraseUnsupported

True means that a call to the CacheStore erase() method is assumed to be unsupported.

Constructor Detail

CacheStoreMap.ReadWriteMap

public CacheStoreMap.ReadWriteMap(CacheStore store,
                                  boolean fBlind)

Construct a read/write CacheStoreMap.

Parameters:

store - the CacheStore to delegate read and write operations to

fBlind - pass true to optimize put() and remove() by allowing them to skip the loading of old values

Method Detail

clear

public void clear()

Clear is explicitly not implemented.

Specified by:

clear in interface java.util.Map

Overrides:

clear in class AbstractKeyBasedMap

containsKey

public boolean containsKey(java.lang.Object oKey)

Returns true if this map contains a mapping for the specified key.

Specified by:

containsKey in interface java.util.Map

Overrides:

containsKey in class AbstractKeyBasedMap

Parameters:

oKey - key whose presence in this map is to be tested.

Returns:

true if this map contains a mapping for the specified key, false otherwise.

get

public java.lang.Object get(java.lang.Object oKey)

Returns the value to which this map maps the specified key.

Specified by:

get in interface java.util.Map

Specified by:

get in class AbstractKeyBasedMap

Parameters:

oKey - the key object

Returns:

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

See Also:

Map.containsKey(Object)

getAll

public java.util.Map getAll(java.util.Collection colKeys)

Get all the specified keys, if they are in the Map. For each key that is in the cache, that key and its corresponding value will be placed in the map that is returned by this method. The absence of a key in the returned map indicates that it was not in the cache, which may imply (for caches that can load behind the scenes) that the requested data could not be loaded.

Overrides:

getAll in class AbstractKeyBasedMap

Parameters:

colKeys - a collection of keys that may be in the named cache

Returns:

a Map of keys to values for the specified keys passed in colKeys

iterateKeys

protected java.util.Iterator iterateKeys()

Create an iterator over the keys in this Map. The Iterator must support remove() if the Map supports removal.

Specified by:

iterateKeys in class AbstractKeyBasedMap

Returns:

a new instance of an Iterator over the keys in this Map

put

public java.lang.Object put(java.lang.Object oKey,
                            java.lang.Object oValue)

Associates the specified value with the specified key in this map.

Specified by:

put in interface java.util.Map

Overrides:

put in class AbstractKeyBasedMap

Parameters:

oKey - key with which the specified value is to be associated

oValue - value to be associated with the specified key

Returns:

previous value associated with specified key, or null if there was no mapping for key

putAll

public void putAll(java.util.Map map)

Copies all of the mappings from the specified map to this map. The effect of this call is equivalent to that of calling AbstractKeyBasedMap.put(java.lang.Object, java.lang.Object) on this map once for each mapping in the passed map. The behavior of this operation is unspecified if the passed map is modified while the operation is in progress.

Specified by:

putAll in interface java.util.Map

Overrides:

putAll in class AbstractKeyBasedMap

Parameters:

map - the Map containing the key/value pairings to put into this Map

remove

public java.lang.Object remove(java.lang.Object oKey)

Removes the mapping for this key from this map if present. Expensive: updates both the underlying cache and the local cache.

Specified by:

remove in interface java.util.Map

Overrides:

remove in class AbstractKeyBasedMap

Parameters:

oKey - key whose mapping is to be removed from the map

Returns:

previous value associated with specified key, or null if there was no mapping for key. A null return can also indicate that the map previously associated null with the specified key, if the implementation supports null values.

removeBlind

protected boolean removeBlind(java.lang.Object oKey)

Removes the mapping for this key from this map if present. This method exists to allow sub-classes to optmiize remove functionalitly for situations in which the original value is not required.

Overrides:

removeBlind in class AbstractKeyBasedMap

Parameters:

oKey - key whose mapping is to be removed from the map

Returns:

true iff the Map changed as the result of this operation

isBlindPutAllowed

protected boolean isBlindPutAllowed()

Determine if the "blind put" optimization is possible.

Returns:

true if put() can return null, regardless of the presence of an old value

isBlindRemoveAllowed

protected boolean isBlindRemoveAllowed()

Determine if the "blind remove" optimization is possible.

Returns:

true if remove() can return null, regardless of the presence of an old value

isStoreUnsupported

protected boolean isStoreUnsupported()

Determine if the CacheStore has been determined to be read-only for store() operations.

Returns:

true if any store() operations have failed due to UOE

isEraseUnsupported

protected boolean isEraseUnsupported()

Determine if the CacheStore has been determined to be read-only for erase() operations.

Returns:

true if any store() operations have failed due to UOE

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