Package software.amazon.lambda.durable.operation

Class ChildContextOperation<T>

java.lang.Object

software.amazon.lambda.durable.operation.BaseDurableOperation

software.amazon.lambda.durable.operation.SerializableDurableOperation<T>

software.amazon.lambda.durable.operation.ChildContextOperation<T>

All Implemented Interfaces:

DurableFuture<T>

public class ChildContextOperation<T>
extends SerializableDurableOperation<T>

Manages the lifecycle of a child execution context.

A child context runs a user function in a separate thread with its own operation counter and checkpoint log. Operations within the child context use the child's context ID as their parentId.

When created as part of a ConcurrencyOperation (e.g., parallel execution), the child notifies its parent on completion via onItemComplete() BEFORE closing its own child context. It also skips checkpointing if the parent operation has already succeeded.

Field Summary

Fields inherited from class software.amazon.lambda.durable.operation.BaseDurableOperation

completionFuture, executionManager, parentOperation

Constructor Summary

Constructors

Constructor	Description
ChildContextOperation(OperationIdentifier operationIdentifier, Function<DurableContext,T> function, TypeToken<T> resultTypeToken, RunInChildContextConfig config, DurableContextImpl durableContext)
ChildContextOperation(OperationIdentifier operationIdentifier, Function<DurableContext,T> function, TypeToken<T> resultTypeToken, RunInChildContextConfig config, DurableContextImpl durableContext, ConcurrencyOperation<?> parentOperation)

Method Summary

Modifier and Type	Method	Description
T	get()	Blocks until the operation completes and returns the result.
protected void	replay(software.amazon.awssdk.services.lambda.model.Operation existing)	Replays the operation.
protected void	start()	Starts the operation.

Methods inherited from class software.amazon.lambda.durable.operation.SerializableDurableOperation

deserializeException, deserializeResult, serializeException, serializeResult

Methods inherited from class software.amazon.lambda.durable.operation.BaseDurableOperation

execute, getChildOperations, getCompletionFuture, getContext, getCurrentThreadContext, getName, getOperation, getOperationId, getSubType, getType, isOperationCompleted, markAlreadyCompleted, onCheckpointComplete, pollForOperationUpdates, pollForOperationUpdates, registerActiveThread, runUserHandler, sendOperationUpdate, sendOperationUpdateAsync, terminateExecution, terminateExecutionWithIllegalDurableOperationException, validateReplay, waitForOperationCompletion

Methods inherited from class java.lang.Object

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

Constructor Details

ChildContextOperation

public ChildContextOperation(OperationIdentifier operationIdentifier,
 Function<DurableContext,T> function,
 TypeToken<T> resultTypeToken,
 RunInChildContextConfig config,
 DurableContextImpl durableContext)

ChildContextOperation

public ChildContextOperation(OperationIdentifier operationIdentifier,
 Function<DurableContext,T> function,
 TypeToken<T> resultTypeToken,
 RunInChildContextConfig config,
 DurableContextImpl durableContext,
 ConcurrencyOperation<?> parentOperation)

Method Details

start

protected void start()

Starts the operation.

Specified by:

start in class BaseDurableOperation

replay

protected void replay(software.amazon.awssdk.services.lambda.model.Operation existing)

Replays the operation.

Specified by:

replay in class BaseDurableOperation

Parameters:

existing - the checkpointed operation state

get

public T get()

Description copied from interface: DurableFuture

Blocks until the operation completes and returns the result.

This delegates to operation.get() which handles: - Thread deregistration (allows suspension) - Thread reactivation (resumes execution) - Result retrieval

Specified by:

get in interface DurableFuture<T>

Specified by:

get in class SerializableDurableOperation<T>

Returns:

the operation result