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Oracle® Coherence Java API Reference Release 3.6.0.0 E15725-01 |
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java.lang.Object
com.tangosol.util.Base
com.tangosol.util.processor.AbstractProcessor
com.tangosol.util.processor.ConditionalPutAll
public class ConditionalPutAll
ConditionalPutAll is an EntryProcessor that performs a Entry.setValue
operation for multiple entries that satisfy the specified condition. <p/> Consider such methods of the ConcurrentMap interface as replace(key, value) and putIfAbsent(key, value). While the regular put(key, value) method has the "multi-put" flavor putAll(map), there are no analogous "bulk" operations for those ConcurrentMap methods. The ConditionalPutAll processor provides the corresponding functionality when used in conjunction with the invokeAll(keys, processor)
API. For example, the replaceAll(map) method could be implemented as:
filter = PresentFilter.INSTANCE; cache.invokeAll(map.keySet(), new ConditionalPutAll(filter, map));
and the putAllIfAbsent(map) could be done by inverting the filter:
filter = new NotFilter(PresentFilter.INSTANCE);
<p/> Obviously, using more specific, fine-tuned filters may provide additional flexibility and efficiency allowing the multi-put operations to be performed conditionally on values of specific attributes (or even calculations) instead of a simple existence check.
Field Summary | |
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protected Filter |
m_filter The underlying filter. |
protected Map |
m_map Specifies the map of new values. |
Constructor Summary | |
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ConditionalPutAll() Default constructor (necessary for the ExternalizableLite interface). |
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ConditionalPutAll(Filter filter, Map map) Construct a ConditionalPutAll processor that updates an entry with a new value if and only if the filter applied to the entry evaluates to true. |
Method Summary | |
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boolean |
equals(Object o) Compare the ConditionalPutAll with another object to determine equality. |
int |
hashCode() Determine a hash value for the ConditionalPutAll object according to the general Object.hashCode() contract. |
Object |
process(InvocableMap.Entry entry) Process a Map.Entry object. |
Map |
processAll(Set setEntries) Process a Set of InvocableMap.Entry objects. This method is semantically equivalent to: Map mapResults = new ListMap(); for (Iterator iter = setEntries.iterator(); iter.hasNext(); ) { Entry entry = (Entry) iter.next(); mapResults.put(entry.getKey(), process(entry)); } return mapResults;Note: if processAll() call throws an exception, entries that were removed from the setEntries would be considered successfully processed and corresponding changes will be made to the underlying Map. |
void |
readExternal(DataInput in) Restore the contents of this object by loading the object's state from the passed DataInput object. |
void |
readExternal(PofReader in) Restore the contents of a user type instance by reading its state using the specified PofReader object. |
String |
toString() Return a human-readable description for this ConditionalPutAll. |
void |
writeExternal(DataOutput out) Save the contents of this object by storing the object's state into the passed DataOutput object. |
void |
writeExternal(PofWriter out) Save the contents of a POF user type instance by writing its state using the specified PofWriter object. |
Field Detail |
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protected Filter m_filter
protected Map m_map
Constructor Detail |
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public ConditionalPutAll()
public ConditionalPutAll(Filter filter, Map map)
filter
- the filter to evaluate all supplied entriesmap
- a map of values to update entries withMethod Detail |
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public Object process(InvocableMap.Entry entry)
process
in interface InvocableMap.EntryProcessor
entry
- the Entry to processpublic Map processAll(Set setEntries)
Map mapResults = new ListMap(); for (Iterator iter = setEntries.iterator(); iter.hasNext(); ) { Entry entry = (Entry) iter.next(); mapResults.put(entry.getKey(), process(entry)); } return mapResults;Note: if processAll() call throws an exception, entries that were removed from the setEntries would be considered successfully processed and corresponding changes will be made to the underlying Map.
processAll
in interface InvocableMap.EntryProcessor
processAll
in class AbstractProcessor
setEntries
- a Set of InvocableMap.Entry objects to processpublic boolean equals(Object o)
public int hashCode()
Object.hashCode()
contract.public String toString()
public void readExternal(DataInput in) throws IOException
readExternal
in interface ExternalizableLite
in
- the DataInput stream to read data from in order to restore the state of this objectIOException
- if an I/O exception occursNotActiveException
- if the object is not in its initial state, and therefore cannot be deserialized intopublic void writeExternal(DataOutput out) throws IOException
writeExternal
in interface ExternalizableLite
out
- the DataOutput stream to write the state of this object toIOException
- if an I/O exception occurspublic void readExternal(PofReader in) throws IOException
readExternal
in interface PortableObject
in
- the PofReader from which to read the object's stateIOException
- if an I/O error occurspublic void writeExternal(PofWriter out) throws IOException
writeExternal
in interface PortableObject
out
- the PofWriter to which to write the object's stateIOException
- if an I/O error occurs
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Oracle® Coherence Java API Reference Release 3.6.0.0 E15725-01 |
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