Package org.elasticsearch.transport
Class TransportRequestDeduplicator<T extends TransportRequest>
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- org.elasticsearch.transport.TransportRequestDeduplicator<T>
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- Type Parameters:
T
- Transport Request Class
public final class TransportRequestDeduplicator<T extends TransportRequest> extends java.lang.Object
Deduplicator forTransportRequest
s that keeps track ofTransportRequest
s that should not be sent in parallel.
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Constructor Summary
Constructors Constructor Description TransportRequestDeduplicator()
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Method Summary
Modifier and Type Method Description void
executeOnce(T request, ActionListener<java.lang.Void> listener, java.util.function.BiConsumer<T,ActionListener<java.lang.Void>> callback)
Ensures a given request not executed multiple times when another equal request is already in-flight.int
size()
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Method Detail
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executeOnce
public void executeOnce(T request, ActionListener<java.lang.Void> listener, java.util.function.BiConsumer<T,ActionListener<java.lang.Void>> callback)
Ensures a given request not executed multiple times when another equal request is already in-flight. If the request is not yet known to the deduplicator it will invoke the passed callback with anActionListener
that must be completed by the caller when the request completes. Once that listener is completed the request will be removed from the deduplicator's internal state. If the request is already known to the deduplicator it will keep track of the given listener and invoke it when the listener passed to the callback on first invocation is completed.- Parameters:
request
- Request to deduplicatelistener
- Listener to invoke on request completioncallback
- Callback to be invoked with request and completion listener the first time the request is added to the deduplicator
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size
public int size()
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