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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.ExtractorProcessor
public class ExtractorProcessor
ExtractorProcessor is an EntryProcessor implementations that extracts a value from an object cached in an InvocableMap. A common usage pattern is:
cache.invoke(oKey, new ExtractorProcessor(extractor));
which is functionally equivalent to the following operation:
extractor.extract(cache.get(oKey));
The major difference is that for clustered caches using the ExtractorProcessor could significantly reduce the amount of network traffic.
Field Summary | |
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protected ValueExtractor |
m_extractor The underlying value extractor. |
Constructor Summary | |
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ExtractorProcessor() Default constructor (necessary for the ExternalizableLite interface). |
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ExtractorProcessor(String sMethod) Construct an ExtractorProcessor for a given method name. |
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ExtractorProcessor(ValueExtractor extractor) Construct an ExtractorProcessor based on the specified ValueExtractor. |
Method Summary | |
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boolean |
equals(Object o) Compare the ExtractorProcessor with another object to determine equality. |
int |
hashCode() Determine a hash value for the ExtractorProcessor object according to the general Object.hashCode() contract. |
Object |
process(InvocableMap.Entry entry) Process a Map.Entry object. |
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 ExtractorProcessor. |
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. |
Methods inherited from class com.tangosol.util.processor.AbstractProcessor |
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processAll |
Field Detail |
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protected ValueExtractor m_extractor
Constructor Detail |
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public ExtractorProcessor()
public ExtractorProcessor(ValueExtractor extractor)
extractor
- a ValueExtractor object; passing null is equivalent to using the IdentityExtractorpublic ExtractorProcessor(String sMethod)
sMethod
- a method name to make a ReflectionExtractor
for; this parameter can also be a dot-delimited sequence of method names which would result in an ExtractorProcessor based on the ChainedExtractor
that is based on an array of corresponding ReflectionExtractor objectsMethod Detail |
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public Object process(InvocableMap.Entry entry)
process
in interface InvocableMap.EntryProcessor
entry
- the Entry 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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