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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.BitHelper
com.tangosol.util.ExternalizableHelper
com.tangosol.util.transformer.ExtractorEventTransformer
public class ExtractorEventTransformer
ExtractorEventTransformer is a special purpose MapEventTransformer
implementation that transforms emitted events, extracting one or more properties from either the OldValue or the NewValue. This transformation will generally result in the change of the values' data type. <p/> Example: the following code will register a listener to receive events only if the value of the AccountBalance property changes. The transformed event's NewValue will be a List containing the LastTransactionTime and AccountBalance properties. The OldValue will always be null.
Filter filter = new ValueChangeEventFilter("getAccountBalance"); ValueExtractor extractor = new MultiExtractor("getLastTransactionTime,getAccountBalance"); MapEventTransformer transformer = new ExtractorEventTransformer(null, extractor); cache.addMapListener(listener, new MapEventTransformerFilter(filter, transformer), false);
Constructor Summary | |
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ExtractorEventTransformer() No-argument constructor for lite deserialization. |
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ExtractorEventTransformer(String sMethod) Construct a ExtractorEventTransformer that transforms MapEvent's values based on the specified method name. |
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ExtractorEventTransformer(ValueExtractor extractor) Construct a ExtractorEventTransformer that transforms MapEvent values based on the specified extractor. |
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ExtractorEventTransformer(ValueExtractor extractorOld, ValueExtractor extractorNew) Construct a ExtractorEventTransformer that transforms MapEvent values based on the specified extractors. |
Method Summary | |
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boolean |
equals(Object o) Compare the ExtractorEventTransformer with another object to determine equality. |
ValueExtractor |
getNewValueExtractor() Return a ValueExtractor used to transfrom the event's NewValue. |
ValueExtractor |
getOldValueExtractor() Return a ValueExtractor used to transfrom the event's OldValue. |
int |
hashCode() Determine a hash value for the ExtractorEventTransformer object according to the general Object.hashCode() contract. |
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() Provide a human-readable representation of this object. |
MapEvent |
transform(MapEvent event) Transform the specified MapEvent using the corresponding extractors. |
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.BitHelper |
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countBits, countBits, countBits, indexOfLSB, indexOfLSB, indexOfLSB, indexOfMSB, indexOfMSB, indexOfMSB, rotateLeft, rotateLeft, rotateLeft, rotateRight, rotateRight, rotateRight, toBitString, toBitString, toBitString |
Constructor Detail |
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public ExtractorEventTransformer()
public ExtractorEventTransformer(ValueExtractor extractor)
extractor
- ValueExtractor to extract MapEvent valuespublic ExtractorEventTransformer(String sMethod)
ValueExtractor
objects; individual array elements will be either ReflectionExtractor
or ChainedExtractor
objects. <p/> Note: The specified extractor will be applied to both old and new values.
sMethod
- the name of the method to invoke via reflectionpublic ExtractorEventTransformer(ValueExtractor extractorOld, ValueExtractor extractorNew)
extractorOld
- extractor to extract the OldValue property(s)extractorNew
- extractor to extract the NewValue property(s)Method Detail |
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public ValueExtractor getOldValueExtractor()
public ValueExtractor getNewValueExtractor()
public MapEvent transform(MapEvent event)
transform
in interface MapEventTransformer
event
- MapEvent object to transformpublic 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 occurspublic boolean equals(Object o)
public int hashCode()
Object.hashCode()
contract.public String toString()
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Oracle® Coherence Java API Reference Release 3.6.0.0 E15725-01 |
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