com.caffinc.jaggr.core

Class BatchAggregation

java.lang.Object

com.caffinc.jaggr.core.BatchAggregation

public class BatchAggregation
extends Object

Aggregates batches of JSON objects based on aggregation operations

Since:

11/29/2016

Author:

Sriram

Method Summary

Methods

Modifier and Type	Method and Description
BatchAggregation	aggregateBatch(Iterable<Map<String,Object>> objectList) Aggregates over a batch of iterable list of JSON Objects
BatchAggregation	aggregateBatch(Iterator<Map<String,Object>> objectIterator) Aggregates over a batch of Iterator of JSON Objects
List<Map<String,Object>>	getFinalResult() Gets the final result of the aggregation
List<Map<String,Object>>	getItermediateResult() Gets the result of the aggregation in the current state

Methods inherited from class java.lang.Object

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

Method Detail

aggregateBatch

public BatchAggregation aggregateBatch(Iterator<Map<String,Object>> objectIterator)

Aggregates over a batch of Iterator of JSON Objects

Parameters:

objectIterator - JSON Object iterator

Returns:

this

aggregateBatch

public BatchAggregation aggregateBatch(Iterable<Map<String,Object>> objectList)

Aggregates over a batch of iterable list of JSON Objects

Parameters:

objectList - Iterable list of JSON Objects

Returns:

this

getItermediateResult

public List<Map<String,Object>> getItermediateResult()

Gets the result of the aggregation in the current state

Note: This process is resource intensive as it creates a copy of the partial result and finalizes computations However this copy is a shallow copy. Further computations that operate on non-primitive results, such as CollectOperation and CollectSetOperation will result in intermediate results that change as more batches are computed. Handle with care. I should just remove this method :|

Use getFinalResult() if you require only the final result of all batches

Returns:

Intermediate result of computations on data processed so far

getFinalResult

public List<Map<String,Object>> getFinalResult()

Gets the final result of the aggregation

Note: This process finalizes the computation on the data passed to this system so far, and clears out the intermediate data. Additional batches of aggregations will be treated as entirely new data.

Returns:

Final result of computations on data processed