Add async server instrumentation for Apache Thrift 0.13

[YaoYingLong]

Previously the Thrift 0.13 instrumentation covered async clients and nonblocking sync server processing, but async server handlers using CustomService.AsyncProcessor were not
covered as a server-side async workflow.

This PR adds instrumentation for:

• org.apache.thrift.TBaseAsyncProcessor#process
• org.apache.thrift.AsyncProcessFunction#getResultHandler
• async frame buffer input/output protocol accessors

The test fixture now separates nonblocking sync server startup from true async server startup and adds a CustomAsyncHandler for async server test coverage.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds end-to-end async server support for Thrift 0.13 instrumentation by decorating nonblocking server protocols, propagating service metadata, and ending server spans at the correct lifecycle points (including async callbacks and one-way requests).

Changes:

• Introduces an async Thrift test handler and adds javaagent tests covering async server spans (success, many, one-way, error).
• Adds protocol decoration/caching via VirtualField and new javaagent instrumentations for TBaseAsyncProcessor and AsyncProcessFunction.
• Updates test utilities to assert server span names by handler class and validate error.type for stable RPC semconv.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
instrumentation/thrift-0.13/testing/src/main/java/io/opentelemetry/instrumentation/thrift/v0_13/CustomAsyncHandler.java	Adds async server handler used by new async-server tests.
instrumentation/thrift-0.13/testing/src/main/java/io/opentelemetry/instrumentation/thrift/v0_13/AbstractThriftTest.java	Refactors server helpers and expands server span assertions (class name + error.type).
instrumentation/thrift-0.13/library/src/main/java/io/opentelemetry/instrumentation/thrift/v0_13/internal/ServerInProtocolDecorator.java	Tracks one-way messages, allows late service-name injection, and de-dupes endSpan().
instrumentation/thrift-0.13/library/src/main/java/io/opentelemetry/instrumentation/thrift/v0_13/internal/AsyncMethodCallbackUtil.java	Adds callback wrapper for async server flows to end spans and restore context.
instrumentation/thrift-0.13/javaagent/src/test/java/io/opentelemetry/javaagent/instrumentation/thrift/v0_13/ThriftTest.java	Adds javaagent tests validating async server instrumentation behavior.
instrumentation/thrift-0.13/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/thrift/v0_13/ThriftTBaseAsyncProcessorInstrumentation.java	Sets service name for async server spans and handles one-way/sync-exception end conditions.
instrumentation/thrift-0.13/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/thrift/v0_13/ThriftSingletons.java	Adds protocol decorator caching to ensure consistent decorator instances per protocol.
instrumentation/thrift-0.13/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/thrift/v0_13/ThriftInstrumentationModule.java	Registers new async-server instrumentations.
instrumentation/thrift-0.13/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/thrift/v0_13/ThriftFrameBufferInstrumentation.java	Ensures getInputProtocol/getOutputProtocol return decorated protocols.
instrumentation/thrift-0.13/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/thrift/v0_13/ThriftAsyncProcessFunctionInstrumentation.java	Wraps result handler callbacks to end spans for async server workflows.

[otelbot]

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