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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.UpdaterProcessor
public class UpdaterProcessor
UpdaterProcessor is an EntryProcessor implementations that updates an attribute of an object cached in an InvocableMap. A common usage pattern is:
cache.invoke(oKey, new UpdaterProcessor(updater, oValue));
which is functionally equivalent to the following operation:
Object oTarget = cache.get(oKey); updater.update(oTarget, oValue); cache.put(oKey, oTarget);
The major difference is that for clustered caches using the UpdaterProcessor allows avoiding explicit concurrency control and could significantly reduce the amount of network traffic.
Field Summary | |
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protected Object |
m_oValue A value to update the entry's value with. |
protected ValueUpdater |
m_updater The underlying ValueUpdater. |
Constructor Summary | |
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UpdaterProcessor() Default constructor (necessary for the ExternalizableLite interface). |
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UpdaterProcessor(String sMethod, Object oValue) Construct an UpdaterProcessor for a given method name. |
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UpdaterProcessor(ValueUpdater updater, Object oValue) Construct an UpdaterProcessor based on the specified ValueUpdater. |
Method Summary | |
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boolean |
equals(Object o) Compare the UpdaterProcessor with another object to determine equality. |
int |
hashCode() Determine a hash value for the UpdaterProcessor 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 UpdaterProcessor. |
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 ValueUpdater m_updater
protected Object m_oValue
Constructor Detail |
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public UpdaterProcessor()
public UpdaterProcessor(ValueUpdater updater, Object oValue)
updater
- a ValueUpdater object; passing null will simpy replace the entry's value with the specified one instead of updating itoValue
- the value to update the target entry withpublic UpdaterProcessor(String sMethod, Object oValue)
sMethod
- a method name to make a ReflectionUpdater
for; this parameter can also be a dot-delimited sequence of method names which would result in using a CompositeUpdater
oValue
- the value to update the target entry withMethod 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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