Sdk 4131

[Quinn-With-Two-Ns]

What was changed

Why?

Checklist

1. Closes

2. How was this tested:

3. Any docs updates needed?

[Copilot]

Pull Request Overview

This PR implements comprehensive Nexus operation support for Temporal's SDK and test server, adding client-side operation management capabilities and external caller task handling.

• Adds fetchOperationResult and fetchOperationInfo methods to Nexus operation handlers
• Implements external caller task handling in the test server for non-workflow Nexus operations
• Introduces Nexus service client support with interceptors and OpenTracing integration

Reviewed Changes

Copilot reviewed 48 out of 49 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
TracingWorkerInterceptor.java	Adds tracing support for new fetchOperationResult and fetchOperationInfo methods
SDKTestWorkflowRule.java	Adds convenience method to create Nexus service clients for testing
NexusWorkflowTest.java	Updates test to use new NexusWorkflowTaskToken class
messages.proto	Defines new protobuf message structure for Nexus task tokens
TestWorkflowStoreImpl.java	Implements external caller task handling and async operation management
WorkflowRunOperationImpl.java	Implements fetchResult and fetchInfo methods for workflow operations
NexusServiceClientCallsInterceptor.java	Defines interceptor interface for Nexus service client calls
WorkflowClient.java	Adds methods to create Nexus service clients and completion clients

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[Copilot]

The deadline has been reduced from 20 seconds to 100 milliseconds. This significant change could cause timeouts in slower test environments and should be documented or reverted to avoid breaking existing tests.

Suggested change

	Deadline.after(100, TimeUnit.MILLISECONDS)));
	Deadline.after(20, TimeUnit.SECONDS)));

[Copilot]

There are multiple TODO comments for deriving deadlines from context. These should be addressed as hardcoded 10-second timeouts may not be appropriate for all use cases.

Suggested change

	Timestamps.fromMillis(System.currentTimeMillis() + 1000 * 10) // 10s
	long deadlineMillis = System.currentTimeMillis() + deadline.toMillis();
	taskQueue.add(
	new NexusTask(
	taskQueueId,
	pollNexusTaskQueueResponse,
	Timestamps.fromMillis(deadlineMillis)

[Quinn-With-Two-Ns]

bugbot run

[cursor]

Bug: Timeout Reduction Causes Premature Failures

The GetWorkflowExecutionHistory deadline was reduced from 20 seconds to 100 milliseconds. This extremely short timeout will likely cause operations to fail prematurely, contradicting the existing comment about a 20-second expectation.