graphql.execution.instrumentation.dataloader

Class DataLoaderDispatcherInstrumentation

java.lang.Object

graphql.execution.instrumentation.SimplePerformantInstrumentation

graphql.execution.instrumentation.dataloader.DataLoaderDispatcherInstrumentation

All Implemented Interfaces:

Instrumentation

@PublicApi
public class DataLoaderDispatcherInstrumentation
extends SimplePerformantInstrumentation

This graphql Instrumentation will dispatch all the contained DataLoaders when each level of the graphql query is executed.

This allows you to use DataLoaders in your DataFetchers to optimal loading of data.

A DataLoaderDispatcherInstrumentation will be automatically added to the GraphQL instrumentation list if one is not present.

See Also:

DataLoader, DataLoaderRegistry

Field Summary

Fields inherited from class graphql.execution.instrumentation.SimplePerformantInstrumentation

INSTANCE

Constructor Summary

Constructors

Constructor and Description
DataLoaderDispatcherInstrumentation() Creates a DataLoaderDispatcherInstrumentation with the default options
DataLoaderDispatcherInstrumentation(DataLoaderDispatcherInstrumentationOptions options) Creates a DataLoaderDispatcherInstrumentation with the specified options

Method Summary

Modifier and Type	Method and Description
@Nullable InstrumentationContext<ExecutionResult>	beginExecuteOperation(InstrumentationExecuteOperationParameters parameters, InstrumentationState rawState) This is called just before the execution of the query operation is started.
@Nullable ExecutionStrategyInstrumentationContext	beginExecutionStrategy(InstrumentationExecutionStrategyParameters parameters, InstrumentationState rawState) This is called each time an ExecutionStrategy is invoked, which may be multiple times per query as the engine recursively descends down over the query.
@Nullable InstrumentationContext<java.lang.Object>	beginFieldFetch(InstrumentationFieldFetchParameters parameters, InstrumentationState rawState) This is called just before a field DataFetcher is invoked.
InstrumentationState	createState(InstrumentationCreateStateParameters parameters) This will be called just before execution to create an object that is given back to all instrumentation methods to allow them to have per execution request state
@NotNull DataFetcher<?>	instrumentDataFetcher(DataFetcher<?> dataFetcher, InstrumentationFieldFetchParameters parameters, InstrumentationState rawState) This is called to instrument a DataFetcher just before it is used to fetch a field, allowing you to adjust what information is passed back or record information about specific data fetches.
@NotNull java.util.concurrent.CompletableFuture<ExecutionResult>	instrumentExecutionResult(ExecutionResult executionResult, InstrumentationExecutionParameters parameters, InstrumentationState rawState) This is called to allow instrumentation to instrument the execution result in some way

Methods inherited from class graphql.execution.instrumentation.SimplePerformantInstrumentation

beginExecuteOperation, beginExecution, beginExecution, beginExecutionStrategy, beginField, beginField, beginFieldComplete, beginFieldComplete, beginFieldFetch, beginFieldListComplete, beginFieldListComplete, beginParse, beginParse, beginSubscribedFieldEvent, beginSubscribedFieldEvent, beginValidation, beginValidation, createState, instrumentDataFetcher, instrumentDocumentAndVariables, instrumentDocumentAndVariables, instrumentExecutionContext, instrumentExecutionContext, instrumentExecutionInput, instrumentExecutionInput, instrumentExecutionResult, instrumentSchema, instrumentSchema

Methods inherited from class java.lang.Object

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

Constructor Detail

DataLoaderDispatcherInstrumentation

public DataLoaderDispatcherInstrumentation()

Creates a DataLoaderDispatcherInstrumentation with the default options

DataLoaderDispatcherInstrumentation

public DataLoaderDispatcherInstrumentation(DataLoaderDispatcherInstrumentationOptions options)

Creates a DataLoaderDispatcherInstrumentation with the specified options

Parameters:

options - the options to control the behaviour

Method Detail

createState

public InstrumentationState createState(InstrumentationCreateStateParameters parameters)

Description copied from interface: Instrumentation

This will be called just before execution to create an object that is given back to all instrumentation methods to allow them to have per execution request state

Specified by:

createState in interface Instrumentation

Overrides:

createState in class SimplePerformantInstrumentation

Parameters:

parameters - the parameters to this step

Returns:

a state object that is passed to each method

instrumentDataFetcher

@NotNull
public @NotNull DataFetcher<?> instrumentDataFetcher(DataFetcher<?> dataFetcher,
                                                              InstrumentationFieldFetchParameters parameters,
                                                              InstrumentationState rawState)

Description copied from interface: Instrumentation

This is called to instrument a DataFetcher just before it is used to fetch a field, allowing you to adjust what information is passed back or record information about specific data fetches. Note the same data fetcher instance maybe presented to you many times and that data fetcher implementations widely vary.

Specified by:

instrumentDataFetcher in interface Instrumentation

Overrides:

instrumentDataFetcher in class SimplePerformantInstrumentation

Parameters:

dataFetcher - the data fetcher about to be used

parameters - the parameters describing the field to be fetched

rawState - the state created during the call to Instrumentation.createState(InstrumentationCreateStateParameters)

Returns:

a non null instrumented DataFetcher, the default is to return to the same object

beginExecuteOperation

@Nullable
public @Nullable InstrumentationContext<ExecutionResult> beginExecuteOperation(InstrumentationExecuteOperationParameters parameters,
                                                                                         InstrumentationState rawState)

Description copied from interface: Instrumentation

This is called just before the execution of the query operation is started.

Specified by:

beginExecuteOperation in interface Instrumentation

Overrides:

beginExecuteOperation in class SimplePerformantInstrumentation

Parameters:

parameters - the parameters to this step

rawState - the state created during the call to Instrumentation.createState(InstrumentationCreateStateParameters)

Returns:

a nullable InstrumentationContext object that will be called back when the step ends (assuming it's not null)

beginExecutionStrategy

@Nullable
public @Nullable ExecutionStrategyInstrumentationContext beginExecutionStrategy(InstrumentationExecutionStrategyParameters parameters,
                                                                                          InstrumentationState rawState)

Description copied from interface: Instrumentation

This is called each time an ExecutionStrategy is invoked, which may be multiple times per query as the engine recursively descends down over the query.

Specified by:

beginExecutionStrategy in interface Instrumentation

Overrides:

beginExecutionStrategy in class SimplePerformantInstrumentation

Parameters:

parameters - the parameters to this step

rawState - the state created during the call to Instrumentation.createState(InstrumentationCreateStateParameters)

Returns:

a nullable ExecutionStrategyInstrumentationContext object that will be called back when the step ends (assuming it's not null)

beginFieldFetch

@Nullable
public @Nullable InstrumentationContext<java.lang.Object> beginFieldFetch(InstrumentationFieldFetchParameters parameters,
                                                                                    InstrumentationState rawState)

Description copied from interface: Instrumentation

This is called just before a field DataFetcher is invoked.

Specified by:

beginFieldFetch in interface Instrumentation

Overrides:

beginFieldFetch in class SimplePerformantInstrumentation

Parameters:

parameters - the parameters to this step

rawState - the state created during the call to Instrumentation.createState(InstrumentationCreateStateParameters)

Returns:

a nullable InstrumentationContext object that will be called back when the step ends (assuming it's not null)

instrumentExecutionResult

@NotNull
public @NotNull java.util.concurrent.CompletableFuture<ExecutionResult> instrumentExecutionResult(ExecutionResult executionResult,
                                                                                                           InstrumentationExecutionParameters parameters,
                                                                                                           InstrumentationState rawState)

Description copied from interface: Instrumentation

This is called to allow instrumentation to instrument the execution result in some way

Specified by:

instrumentExecutionResult in interface Instrumentation

Overrides:

instrumentExecutionResult in class SimplePerformantInstrumentation

Parameters:

executionResult - CompletableFuture of the result to instrument

parameters - the parameters to this step

rawState - the state created during the call to Instrumentation.createState(InstrumentationCreateStateParameters)

Returns:

a new execution result completable future