Rework shim between ContextManager and the legacy scope manager#11938
Rework shim between ContextManager and the legacy scope manager#11938mcculls wants to merge 2 commits into
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Pull request overview
Reworks how the Datadog Context API’s ContextManager is wired when running with the legacy scope manager, so the legacy shim can be registered before instrumentation and can be toggled via isLegacyContextManagerEnabled. This helps support end-to-end testing across both context-manager implementations while keeping context requests routed through AgentTracer to the active tracer implementation.
Changes:
- Adds
Context-API bridging methods toAgentTracer.TracerAPIand introduces an installableLegacyContextManagershim. - Stops
ContinuableScopeManagerfrom self-registering as aContextManager; instead, registration happens conditionally inAgentandCoreTracer. - Updates benchmarks/tests accordingly and temporarily disables a few non-legacy-mode context swap tests that currently mix legacy
activeSpan()and the Context API.
Reviewed changes
Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.
Show a summary per file
| File | Description |
|---|---|
| internal-api/src/main/java/datadog/trace/bootstrap/instrumentation/api/AgentTracer.java | Adds Context API bridging to TracerAPI and a legacy ContextManager shim + installer. |
| internal-api/build.gradle.kts | Excludes the new legacy shim class from coverage. |
| dd-trace-core/src/main/java/datadog/trace/core/scopemanager/ContinuableScopeManager.java | Removes ContextManager implementation/registration behavior from the legacy scope manager. |
| dd-trace-core/src/main/java/datadog/trace/core/CoreTracer.java | Conditionally installs the legacy context manager shim and exposes Context API methods via TracerAPI. |
| dd-trace-core/src/jmh/java/datadog/context/ContextManagerBenchmark.java | Updates benchmark to wrap ContinuableScopeManager now that it no longer implements ContextManager. |
| dd-trace-core/src/test/java/datadog/trace/core/scopemanager/ScopeManagerTest.java | Registers the test tracer with AgentTracer so Context API shimming can resolve to the correct tracer. |
| dd-trace-core/src/test/java/datadog/trace/core/PendingTraceTestBase.java | Same as above for pending-trace tests. |
| dd-java-agent/agent-bootstrap/src/main/java/datadog/trace/bootstrap/Agent.java | Conditionally installs the legacy context manager shim during agent bootstrap. |
| dd-java-agent/instrumentation/kafka/kafka-clients-3.8/src/test/groovy/KafkaClientTestBase.groovy | Temporarily ignores a non-legacy context swap forked test. |
| dd-java-agent/instrumentation/kafka/kafka-clients-0.11/src/test/groovy/KafkaClientTestBase.groovy | Temporarily ignores a non-legacy context swap forked test. |
| dd-java-agent/instrumentation/jms/javax-jms-1.1/src/test/groovy/JMS1Test.groovy | Temporarily ignores a non-legacy context swap forked test. |
| dd-java-agent/instrumentation/aws-java/aws-java-sqs-2.0/src/test/java/SqsClientTest.java | Temporarily disables non-legacy context swap forked tests. |
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Kafka / consumer-benchmarkParameters
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SummaryFound 0 performance improvements and 0 performance regressions! Performance is the same for 3 metrics, 0 unstable metrics. See unchanged results
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SummaryFound 0 performance improvements and 0 performance regressions! Performance is the same for 3 metrics, 0 unstable metrics. See unchanged results
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Debugger benchmarksParameters
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SummaryFound 0 performance improvements and 0 performance regressions! Performance is the same for 10 metrics, 5 unstable metrics. See unchanged results
Request duration reports for reportsgantt
title reports - request duration [CI 0.99] : candidate=None, baseline=None
dateFormat X
axisFormat %s
section baseline
noprobe (349.546 µs) : 325, 374
. : milestone, 350,
basic (307.938 µs) : 300, 316
. : milestone, 308,
loop (9.003 ms) : 8995, 9010
. : milestone, 9003,
section candidate
noprobe (361.135 µs) : 322, 400
. : milestone, 361,
basic (310.232 µs) : 300, 320
. : milestone, 310,
loop (9.011 ms) : 8990, 9032
. : milestone, 9011,
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mhlidd and
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More details
Rework of Context API shim for legacy scope manager is architecturally sound. Changes defer Context manager registration to early bootstrap via AgentTracer.installLegacyContextManager(), before instrumentation starts. All new methods properly delegate through CoreTracer to ContinuableScopeManager, with safe NoopTracerAPI fallback. Thread-safety and initialization order are correct. Disabled tests are intentional migration artifacts.
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…for proper swapping over to ThreadLocalContextManager.
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(as the migration proceeds we'll make it toggleable, then change the default depending on the Java version)
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What Does This Do
Rework Context -> legacy scope manager shim so it can be registered before instrumentation. Context requests are dispatched via
AgentTracerto the currently registered tracer implementation. This helps migrate instrumentations to the Context API without requiring the tracer to be installed earlier than it is at the moment.We deliberately don't install the legacy shim for
dd-trace-ot/DDTracerbecause that artifact doesn't expose the Context API to its users, and none of the implementation needed for the OpenTracing API uses Context. Note that the legacy scope manager implementation deliberately avoids calling back into the Context API (exceptContext.root()but that's safe because it's a constant and does not result in a context/scope manager call.)Motivation
Supports clean switching between the two context managers for complete end-to-end testing.
Additional Notes
Installs the legacy approach to managing contexts everywhere to begin with.
As the migration proceeds we'll make it toggleable, then change the default depending on the Java version.
Contributor Checklist
type:and (comp:orinst:) labels in addition to any other useful labelsclose,fix, or any linking keywords when referencing an issueUse
solvesinstead, and assign the PR milestone to the issueJira ticket: [PROJ-IDENT]