Add dynamic executor loading to /flow/meta api - #1156
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📝 WalkthroughSummary
WalkthroughThe Flow Management v1 module resolves legacy and dynamically registered flow executors through Sequence Diagram(s)sequenceDiagram
participant Client
participant FlowMetaHandler
participant ExecutorMetadataResolver
participant FlowExecutorRegistry
participant FlowMetaResponse
Client->>FlowMetaHandler: request flow metadata
FlowMetaHandler->>ExecutorMetadataResolver: resolve executors
FlowMetaHandler->>ExecutorMetadataResolver: resolve connections and required groups
ExecutorMetadataResolver->>FlowExecutorRegistry: discover registered executors
FlowExecutorRegistry-->>ExecutorMetadataResolver: return executor metadata
ExecutorMetadataResolver-->>FlowMetaHandler: return supported names and extensions
FlowMetaHandler->>FlowMetaResponse: create response with extensionExecutors
FlowMetaResponse-->>Client: return flow metadata
🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 1
🧹 Nitpick comments (2)
components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/response/handlers/RegistrationFlowMetaHandler.java (1)
78-90: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick winCopy the superclass baseline before mutating it.
Line 81 mutates the list returned by
super.getLegacyExecutorBaseline()directly.AskPasswordFlowMetaHandlerandPasswordRecoveryFlowMetaHandlerwrap the result in a newArrayList. The current code works because the base method returns a fresh mutable list, but the copy keeps the three handlers consistent and protects against a future base change that returns an immutable list.♻️ Proposed refactor
- List<String> supportedExecutors = super.getLegacyExecutorBaseline(); + List<String> supportedExecutors = new ArrayList<>(super.getLegacyExecutorBaseline());🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/response/handlers/RegistrationFlowMetaHandler.java` around lines 78 - 90, Update RegistrationFlowMetaHandler.getLegacyExecutorBaseline to wrap the list returned by super.getLegacyExecutorBaseline() in a new mutable ArrayList before adding the executor constants, matching AskPasswordFlowMetaHandler and PasswordRecoveryFlowMetaHandler.components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/utils/ExecutorMetadataResolver.java (1)
152-182: 🚀 Performance & Scalability | 🔵 Trivial | ⚡ Quick winConsider memoizing
declaredExecutors()per instance.
declaredExecutors()calls the engine on every invocation.resolve(),getConnectionExecutorMap(), andgetExecutorsWithTag()each trigger a separate call within one request. A single memoized field would keep the resolved view consistent and reduce repeated service lookups.Also note that Line 176 adds extension names without a duplicate check, while
metadatade-duplicates by name. If the engine can return two entries with the same name,supportedExecutorNamescontains a duplicate.♻️ Proposed refactor
private final String flowType; private final List<String> legacyBaseline; + private List<FlowExecutorInfo> declared; private List<String> supportedExecutorNames;private List<FlowExecutorInfo> declaredExecutors() { + if (declared != null) { + return declared; + } try { - return FlowExecutorMetadataService.getInstance().getComposerExecutors(flowType); + declared = FlowExecutorMetadataService.getInstance().getComposerExecutors(flowType); } catch (Throwable e) { LOG.warn("Failed to resolve dynamically registered executors for flow type: " + flowType + ". Falling back to the built in executor list.", e); - return Collections.emptyList(); + declared = Collections.emptyList(); } + return declared; }LinkedHashMap<String, ExecutorMetadata> metadata = new LinkedHashMap<>(); for (FlowExecutorInfo extension : extensions) { - names.add(extension.getName()); - metadata.put(extension.getName(), toModel(extension)); + if (metadata.containsKey(extension.getName()) || names.contains(extension.getName())) { + continue; + } + names.add(extension.getName()); + metadata.put(extension.getName(), toModel(extension)); }Also applies to: 211-226
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/utils/ExecutorMetadataResolver.java` around lines 152 - 182, Memoize the result of declaredExecutors() once per ExecutorMetadataResolver instance and reuse that field in resolve(), getConnectionExecutorMap(), and getExecutorsWithTag() so all lookups share one consistent view. While building supportedExecutorNames in resolve(), only add an extension name when it is not already present, matching metadata’s name de-duplication behavior.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In
`@components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/utils/ExecutorMetadataResolver.java`:
- Around line 74-78: Resolve the Javadoc reference in the parameter
documentation for the resolver method by replacing the unresolved {`@link`
FlowTypes} reference with a fully qualified type name or plain text. Keep the
description of the flow type unchanged.
---
Nitpick comments:
In
`@components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/response/handlers/RegistrationFlowMetaHandler.java`:
- Around line 78-90: Update
RegistrationFlowMetaHandler.getLegacyExecutorBaseline to wrap the list returned
by super.getLegacyExecutorBaseline() in a new mutable ArrayList before adding
the executor constants, matching AskPasswordFlowMetaHandler and
PasswordRecoveryFlowMetaHandler.
In
`@components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/utils/ExecutorMetadataResolver.java`:
- Around line 152-182: Memoize the result of declaredExecutors() once per
ExecutorMetadataResolver instance and reuse that field in resolve(),
getConnectionExecutorMap(), and getExecutorsWithTag() so all lookups share one
consistent view. While building supportedExecutorNames in resolve(), only add an
extension name when it is not already present, matching metadata’s name
de-duplication behavior.
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components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/gen/java/org/wso2/carbon/identity/api/server/flow/management/v1/ExecutorMetadata.javais excluded by!**/gen/**components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/gen/java/org/wso2/carbon/identity/api/server/flow/management/v1/FlowMetaResponse.javais excluded by!**/gen/**
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components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/pom.xmlcomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/constants/FlowEndpointConstants.javacomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/response/handlers/AbstractMetaResponseHandler.javacomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/response/handlers/AskPasswordFlowMetaHandler.javacomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/response/handlers/PasswordRecoveryFlowMetaHandler.javacomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/response/handlers/RegistrationFlowMetaHandler.javacomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/utils/ExecutorMetadataResolver.javacomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/utils/Utils.javacomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/resources/flow.yaml
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Actionable comments posted: 2
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In
`@components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/utils/ExecutorMetadataResolver.java`:
- Around line 218-226: Cache the result of the executor lookup shared by
declaredExecutors(), resolve(), getConnectionExecutorMap(), and
getExecutorsWithTag() so each resolver output in a request uses the same
executor set. Ensure the cache also preserves the fallback empty list when
lookup fails, and reuse the cached value instead of invoking
FlowExecutorMetadataService.getInstance().getComposerExecutors(flowType)
multiple times.
- Around line 175-179: Update the extension loop in resolve() to de-duplicate
executor names before adding them to names, while still updating metadata using
the same accepted name and corresponding FlowExecutorInfo. Ensure duplicate
registry entries do not produce repeated names and preserve the existing
last-entry metadata behavior.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/gen/java/org/wso2/carbon/identity/api/server/flow/management/v1/ExecutorMetadata.javais excluded by!**/gen/**components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/gen/java/org/wso2/carbon/identity/api/server/flow/management/v1/FlowMetaResponse.javais excluded by!**/gen/**
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components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/pom.xmlcomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/constants/FlowEndpointConstants.javacomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/response/handlers/AbstractMetaResponseHandler.javacomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/response/handlers/AskPasswordFlowMetaHandler.javacomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/response/handlers/PasswordRecoveryFlowMetaHandler.javacomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/response/handlers/RegistrationFlowMetaHandler.javacomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/utils/ExecutorMetadataResolver.javacomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/utils/Utils.javacomponents/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/resources/flow.yaml
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- components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/resources/flow.yaml
- components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/utils/Utils.java
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- components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/constants/FlowEndpointConstants.java
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VIHANGAGIT
commented
Aug 10, 2026
| * | ||
| * @return Mutable list of executor names, in the order they should be presented. | ||
| */ | ||
| protected List<String> getLegacyExecutorBaseline() { |
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getSupportedExecutors
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No need of 2 methods to get common and another to extensions
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This will require all additional executors added for each flow to be defined in FlowEndpointConstants. Current approach is cleaner.
VIHANGAGIT
commented
Aug 10, 2026
| protected List<String> getLegacyExecutorBaseline() { | ||
|
|
||
| List<String> supportedExecutors = super.getSupportedExecutors(); | ||
| List<String> supportedExecutors = super.getLegacyExecutorBaseline(); |
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get the union to here
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This requires all additional executors beyond common ones to be added to Constants. Current approach is cleaner
VIHANGAGIT
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Aug 10, 2026
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Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (1)
components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/utils/ExecutorMetadataResolver.java (1)
222-227: 🩺 Stability & Availability | 🟠 Major | ⚡ Quick winNarrow the registry failure boundary. An
ErrorfromFlowExecutorMetadataServiceis converted into incomplete metadata. Catch the registry exception type, orExceptionif a broad fallback is required.🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/utils/ExecutorMetadataResolver.java` around lines 222 - 227, Update the exception handler around FlowExecutorMetadataService.getInstance().getComposerExecutors(flowType) to catch the registry’s specific exception type, or Exception if a broad fallback is required, instead of Throwable; preserve the existing warning and empty-list fallback for caught failures.Source: MCP tools
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Outside diff comments:
In
`@components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/main/java/org/wso2/carbon/identity/api/server/flow/management/v1/utils/ExecutorMetadataResolver.java`:
- Around line 222-227: Update the exception handler around
FlowExecutorMetadataService.getInstance().getComposerExecutors(flowType) to
catch the registry’s specific exception type, or Exception if a broad fallback
is required, instead of Throwable; preserve the existing warning and empty-list
fallback for caught failures.
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components/org.wso2.carbon.identity.api.server.flow.management/org.wso2.carbon.identity.api.server.flow.management.v1/src/gen/java/org/wso2/carbon/identity/api/server/flow/management/v1/ExecutorMetadata.javais excluded by!**/gen/**
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VIHANGAGIT
commented
Aug 19, 2026
| description: Short explanation of what this step does | ||
| example: Verifies the user's identity with an external verification provider. | ||
| behaviorFlags: | ||
| type: array |
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Make this a first class variable rather than an array
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Purpose
This pull request introduces support for extension executors in the flow management API, allowing the system to dynamically include metadata for executors contributed by deployed extensions. It also refactors how legacy executors are handled for backward compatibility and sets up infrastructure for resolving executor metadata.
Related Issues
Related PRs
Approach
Extension Executor Metadata Support:
ExecutorMetadatamodel class to represent metadata about extension executors, including fields such asname,displayName,description,tags,icon,requiresConnection, andassociatedAuthenticator. (ExecutorMetadata.java)FlowMetaResponsemodel to include a newextensionExecutorsfield, along with its getter, setter, and helper methods, so that API responses can return metadata for extension executors.Legacy Executors Refactoring:
LegacyExecutorsinner class inFlowEndpointConstantsto encapsulate hardcoded executor names, recovery factors, and authenticator-to-executor mappings for backward compatibility. This will allow the system to union dynamic executors on top of these legacy definitions. (FlowEndpointConstants.java)Infrastructure and Dependency Updates:
org.wso2.carbon.identity.flow.execution.enginemodule, which is likely required for the new executor metadata resolution logic. (pom.xml)ExecutorMetadataResolverutility import and an instance field inAbstractMetaResponseHandler, preparing the handler for resolving executor metadata from extensions.AbstractMetaResponseHandler.java)