org.calrissian.accumulorecipes.metricsstore.ext.custom.iterator

Class FunctionCombiner

java.lang.Object

org.apache.accumulo.core.iterators.WrappingIterator

org.apache.accumulo.core.iterators.Combiner

org.calrissian.accumulorecipes.metricsstore.ext.custom.iterator.FunctionCombiner

All Implemented Interfaces:

org.apache.accumulo.core.iterators.OptionDescriber, org.apache.accumulo.core.iterators.SortedKeyValueIterator<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value>

public class FunctionCombiner
extends org.apache.accumulo.core.iterators.Combiner

Accumulo Combiner class that handles the generic logic for enabling custom function aggregation.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.accumulo.core.iterators.Combiner

org.apache.accumulo.core.iterators.Combiner.ValueIterator

Nested classes/interfaces inherited from interface org.apache.accumulo.core.iterators.OptionDescriber

org.apache.accumulo.core.iterators.OptionDescriber.IteratorOptions

Field Summary

Fields

Modifier and Type	Field and Description
static String	FUNCTION_CLASS

Fields inherited from class org.apache.accumulo.core.iterators.Combiner

ALL_OPTION, COLUMNS_OPTION

Constructor Summary

Constructors

Constructor and Description
FunctionCombiner()

Method Summary

Methods

Modifier and Type	Method and Description
void	init(org.apache.accumulo.core.iterators.SortedKeyValueIterator<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value> source, Map<String,String> options, org.apache.accumulo.core.iterators.IteratorEnvironment env)
org.apache.accumulo.core.data.Value	reduce(org.apache.accumulo.core.data.Key key, Iterator<org.apache.accumulo.core.data.Value> iter)
static <T> void	setFunctionClass(org.apache.accumulo.core.client.IteratorSetting is, Class<? extends MetricFunction<T>> functionClazz)

Methods inherited from class org.apache.accumulo.core.iterators.Combiner

deepCopy, describeOptions, getTopKey, getTopValue, hasTop, next, seek, setColumns, setCombineAllColumns, validateOptions

Methods inherited from class org.apache.accumulo.core.iterators.WrappingIterator

getSource, setSource

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

FUNCTION_CLASS

public static final String FUNCTION_CLASS

See Also:

Constant Field Values

Constructor Detail

FunctionCombiner

public FunctionCombiner()

Method Detail

init

public void init(org.apache.accumulo.core.iterators.SortedKeyValueIterator<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value> source,
        Map<String,String> options,
        org.apache.accumulo.core.iterators.IteratorEnvironment env)
          throws IOException

Specified by:

init in interface org.apache.accumulo.core.iterators.SortedKeyValueIterator<org.apache.accumulo.core.data.Key,org.apache.accumulo.core.data.Value>

Overrides:

init in class org.apache.accumulo.core.iterators.Combiner

Throws:

IOException

setFunctionClass

public static <T> void setFunctionClass(org.apache.accumulo.core.client.IteratorSetting is,
                        Class<? extends MetricFunction<T>> functionClazz)

reduce

public org.apache.accumulo.core.data.Value reduce(org.apache.accumulo.core.data.Key key,
                                         Iterator<org.apache.accumulo.core.data.Value> iter)

Specified by:

reduce in class org.apache.accumulo.core.iterators.Combiner