public class SingleEmitAggregator extends Object implements Aggregator<org.apache.storm.trident.operation.impl.SingleEmitAggregator.SingleEmitState>
Modifier and Type | Class and Description |
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static interface |
SingleEmitAggregator.BatchToPartition |
Constructor and Description |
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SingleEmitAggregator(Aggregator agg,
SingleEmitAggregator.BatchToPartition batchToPartition) |
Modifier and Type | Method and Description |
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void |
aggregate(org.apache.storm.trident.operation.impl.SingleEmitAggregator.SingleEmitState val,
TridentTuple tuple,
TridentCollector collector) |
void |
cleanup()
When running in local mode, called when the local cluster is being shut down.
|
void |
complete(org.apache.storm.trident.operation.impl.SingleEmitAggregator.SingleEmitState val,
TridentCollector collector) |
org.apache.storm.trident.operation.impl.SingleEmitAggregator.SingleEmitState |
init(Object batchId,
TridentCollector collector) |
void |
prepare(Map<String,Object> conf,
TridentOperationContext context)
Called when the `Operation` is first initialized.
|
public SingleEmitAggregator(Aggregator agg, SingleEmitAggregator.BatchToPartition batchToPartition)
public org.apache.storm.trident.operation.impl.SingleEmitAggregator.SingleEmitState init(Object batchId, TridentCollector collector)
init
in interface Aggregator<org.apache.storm.trident.operation.impl.SingleEmitAggregator.SingleEmitState>
public void aggregate(org.apache.storm.trident.operation.impl.SingleEmitAggregator.SingleEmitState val, TridentTuple tuple, TridentCollector collector)
aggregate
in interface Aggregator<org.apache.storm.trident.operation.impl.SingleEmitAggregator.SingleEmitState>
public void complete(org.apache.storm.trident.operation.impl.SingleEmitAggregator.SingleEmitState val, TridentCollector collector)
complete
in interface Aggregator<org.apache.storm.trident.operation.impl.SingleEmitAggregator.SingleEmitState>
public void prepare(Map<String,Object> conf, TridentOperationContext context)
Operation
prepare
in interface Operation
conf
- the Storm configuration mapcontext
- the operation context which provides information such as the number of partitions in the stream, and the current
partition index. It also provides methods for registering operation-specific metrics.TridentOperationContext
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