com.tangosol.util.processor

Class ConditionalProcessor<K,V,T>

java.lang.Object

com.tangosol.util.Base

com.tangosol.util.processor.AbstractProcessor<K,V,T>

com.tangosol.util.processor.ConditionalProcessor<K,V,T>

All Implemented Interfaces:

ExternalizableLite, PortableObject, InvocableMap.EntryProcessor<K,V,T>, Serializable

public class ConditionalProcessor<K,V,T>
extends AbstractProcessor<K,V,T>
implements ExternalizableLite, PortableObject

Conditional entry processor represents a processor that is invoked conditionally based on the result of an entry evaluation.

If the underlying filter expects to evaluate existent entries only (i.e. entries for which isPresent() is true), it should be combined with a PresentFilter as follows:

 Filter filterPresent = new AndFilter(PresentFilter.INSTANCE, filter);
 

Author:

gg/jh 2005.10.31

See Also:

PresentFilter

Nested Class Summary

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

Base.LoggingWriter, Base.StackFrame

Field Summary

Fields

Modifier and Type	Field and Description
protected Filter<V>	m_filter The underlying filter.
protected InvocableMap.EntryProcessor<K,V,T>	m_processor The underlying entry processor.

Fields inherited from class com.tangosol.util.Base

LOG_ALWAYS, LOG_DEBUG, LOG_ERR, LOG_INFO, LOG_MAX, LOG_MIN, LOG_QUIET, LOG_WARN, POWER_0, POWER_G, POWER_K, POWER_M, POWER_T, UNIT_D, UNIT_H, UNIT_M, UNIT_MS, UNIT_NS, UNIT_S, UNIT_US

Constructor Summary

Constructors

Constructor and Description
ConditionalProcessor() Default constructor (necessary for the ExternalizableLite interface).
ConditionalProcessor(Filter<V> filter, InvocableMap.EntryProcessor<K,V,T> processor) Construct a ConditionalProcessor for the specified filter and the processor.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o) Compare the ConditionalProcessor with another object to determine equality.
int	hashCode() Determine a hash value for the ConditionalProcessor object according to the general Object.hashCode() contract.
T	process(InvocableMap.Entry<K,V> entry) Process a Map.Entry object if it satisfies the underlying filter.
Map<K,T>	processAll(Set<? extends InvocableMap.Entry<K,V>> setEntries) Process a Set of InvocableMap.Entry objects.
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 ConditionalProcessor.
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.Base

azzert, azzert, azzert, azzertFailed, breakLines, breakLines, capitalize, checkNotEmpty, checkNotNull, checkRange, computeSafeWaitTime, decimalValue, dup, dup, ensureBigDecimal, ensureClassLoader, ensureRuntimeException, ensureRuntimeException, equals, equalsDeep, err, err, err, err, err, escape, formatDateTime, getCallerStackFrame, getCommonMonitor, getCommonMonitor, getCommonMonitor, getContextClassLoader, getContextClassLoader, getDeepMessage, getErr, getLastSafeTimeMillis, getLog, getMaxDecDigits, getMaxHexDigits, getOriginalException, getOut, getRandom, getRandomBinary, getRandomBinary, getRandomString, getSafeTimeMillis, getStackFrame, getStackFrames, getStackTrace, getStackTrace, getStackTrace, getThreadFactory, getTimeZone, getUpTimeMillis, hashCode, hexValue, indentString, indentString, isDecimal, isHex, isLogEcho, isOctal, log, log, log, log, log, makeInteger, makeLong, makeThread, mergeArray, mergeBooleanArray, mergeByteArray, mergeCharArray, mergeDoubleArray, mergeFloatArray, mergeIntArray, mergeLongArray, mod, mod, octalValue, out, out, out, out, out, pad, parseBandwidth, parseBandwidth, parseDelimitedString, parseHex, parseHex, parseMemorySize, parseMemorySize, parsePercentage, parseTime, parseTime, parseTimeNanos, parseTimeNanos, printStackTrace, randomize, randomize, randomize, randomize, read, read, read, read, read, read, read, replace, setErr, setLog, setLogEcho, setOut, sleep, toBandwidthString, toBandwidthString, toCharEscape, toCrc, toCrc, toCrc, toCrc, toCrc, toDecString, toDelimitedString, toDelimitedString, toDelimitedString, toDelimitedString, toHex, toHex, toHexDump, toHexEscape, toHexEscape, toHexEscape, toHexEscape, toHexString, toMemorySizeString, toMemorySizeString, toQuotedCharEscape, toQuotedStringEscape, toSqlString, toString, toString, toStringEscape, toUnicodeEscape, trace, trace, trace, trace, trace, trace, trace, trace, trace, truncateString, truncateString, wait

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

m_filter

protected Filter<V> m_filter

The underlying filter.

m_processor

protected InvocableMap.EntryProcessor<K,V,T> m_processor

The underlying entry processor.

Constructor Detail

ConditionalProcessor

public ConditionalProcessor()

Default constructor (necessary for the ExternalizableLite interface).

ConditionalProcessor

public ConditionalProcessor(Filter<V> filter,
                            InvocableMap.EntryProcessor<K,V,T> processor)

Construct a ConditionalProcessor for the specified filter and the processor.

The specified entry processor gets invoked if and only if the filter applied to the InvocableMap entry evaluates to true; otherwise the result of the process(com.tangosol.util.InvocableMap.Entry<K, V>) invocation will return null.

Parameters:

filter - the filter

processor - the entry processor

Method Detail

process

public T process(InvocableMap.Entry<K,V> entry)

Process a Map.Entry object if it satisfies the underlying filter.

Note: if this method throws an exception, all modifications to the supplied entry or any other entries retrieved via the BackingMapContext.getBackingMapEntry(java.lang.Object) API will be rolled back leaving all underlying values unchanged.

Specified by:

process in interface InvocableMap.EntryProcessor<K,V,T>

Parameters:

entry - the Entry to process

Returns:

the result of the processing, if any

processAll

public Map<K,T> processAll(Set<? extends InvocableMap.Entry<K,V>> 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();

      if (InvocableMapHelper.evaluateEntry(filter, entry))
          {
          mapResults.put(entry.getKey(), processor.process(entry));
          }
       }
   return mapResults;
 

Note: if processAll() call throws an exception, only the entries that were removed from the setEntries would be considered successfully processed and the corresponding changes made to the underlying Map; changes made to the remaining entries or any other entries obtained from BackingMapContext.getBackingMapEntry(java.lang.Object) will not be processed.

Specified by:

processAll in interface InvocableMap.EntryProcessor<K,V,T>

Overrides:

processAll in class AbstractProcessor<K,V,T>

Parameters:

setEntries - a Set of InvocableMap.Entry objects to process

Returns:

a Map containing the results of the processing, up to one entry for each InvocableMap.Entry that was processed, keyed by the keys of the Map that were processed, with a corresponding value being the result of the processing for each key

equals

public boolean equals(Object o)

Compare the ConditionalProcessor with another object to determine equality.

Overrides:

equals in class Object

Returns:

true iff this ConditionalProcessor and the passed object are equivalent ConditionalProcessors

hashCode

public int hashCode()

Determine a hash value for the ConditionalProcessor object according to the general Object.hashCode() contract.

Overrides:

hashCode in class Object

Returns:

an integer hash value for this ConditionalProcessor object

toString

public String toString()

Return a human-readable description for this ConditionalProcessor.

Overrides:

toString in class Object

Returns:

a String description of the ConditionalProcessor

readExternal

public void readExternal(DataInput in)
                  throws IOException

Restore the contents of this object by loading the object's state from the passed DataInput object.

Specified by:

readExternal in interface ExternalizableLite

Parameters:

in - the DataInput stream to read data from in order to restore the state of this object

Throws:

IOException - if an I/O exception occurs

NotActiveException - if the object is not in its initial state, and therefore cannot be deserialized into

writeExternal

public void writeExternal(DataOutput out)
                   throws IOException

Save the contents of this object by storing the object's state into the passed DataOutput object.

Specified by:

writeExternal in interface ExternalizableLite

Parameters:

out - the DataOutput stream to write the state of this object to

Throws:

IOException - if an I/O exception occurs

readExternal

public void readExternal(PofReader in)
                  throws IOException

Restore the contents of a user type instance by reading its state using the specified PofReader object.

Specified by:

readExternal in interface PortableObject

Parameters:

in - the PofReader from which to read the object's state

Throws:

IOException - if an I/O error occurs

writeExternal

public void writeExternal(PofWriter out)
                   throws IOException

Save the contents of a POF user type instance by writing its state using the specified PofWriter object.

Specified by:

writeExternal in interface PortableObject

Parameters:

out - the PofWriter to which to write the object's state

Throws:

IOException - if an I/O error occurs