graphql.execution.instrumentation

Interface InstrumentationContext<T>

All Known Subinterfaces:

DeferredFieldInstrumentationContext, ExecutionStrategyInstrumentationContext

All Known Implementing Classes:

SimpleInstrumentationContext

public interface InstrumentationContext<T>

When a Instrumentation.'beginXXX()' method is called then it must return a non null InstrumentationContext that will be invoked when the step is first dispatched and then when it completes. Sometimes this is effectively the same time whereas at other times its when an asynchronous CompletableFuture completes. This pattern of construction of an object then call back is intended to allow "timers" to be created that can instrument what has just happened or "loggers" to be called to record what has happened.

Method Summary

Modifier and Type	Method and Description
void	onCompleted(T result, java.lang.Throwable t) This is invoked when the instrumentation step is fully completed
void	onDispatched(java.util.concurrent.CompletableFuture<T> result) This is invoked when the instrumentation step is initially dispatched

Method Detail

onDispatched

void onDispatched(java.util.concurrent.CompletableFuture<T> result)

This is invoked when the instrumentation step is initially dispatched

Parameters:

result - the result of the step as a completable future

onCompleted

void onCompleted(T result,
                 java.lang.Throwable t)

This is invoked when the instrumentation step is fully completed

Parameters:

result - the result of the step (which may be null)

t - this exception will be non null if an exception was thrown during the step