[FaultInjection]addSupportForHeadCollectionRequest

[xinlian12]

Changes

1. Add support for head collection request in fault injection

 FaultInjectionRule faultInjectionRule =
            new FaultInjectionRuleBuilder(faultInjectionRuleId)
                .condition(
                    new FaultInjectionConditionBuilder()
                        .operationType(FaultInjectionOperationType.HEAD_COLLECTION)
                        .build()
                )
                .result(
                    FaultInjectionResultBuilders
                        .getResultBuilder(serverErrorType)
                        .times(2)
                        .build()
                )
                .duration(Duration.ofMinutes(5))
                .build()

2. Allow config a TransportClientInteceptor to modify the store response on direct layer, which can be used to trigger barrier request flow

        CosmosInterceptorHelper.registerTransportClientInterceptor(
            newClient,
            (request, storeResponse) -> {
                if (request.getResourceType() == ResourceType.Document && request.getOperationType() == operationType) {
                    // Decrement so that GCLSN < LSN to simulate the replication lag
                    storeResponse.setGCLSN(storeResponse.getLSN() - 2L);
                }
                return storeResponse;
            }
        );

[Copilot]

Pull Request Overview

This PR adds support for fault injection on head collection requests (barrier requests) and introduces a transport client interceptor mechanism to modify store responses at the direct layer for testing purposes.

Key Changes:

• Added HEAD_COLLECTION operation type to fault injection framework for testing barrier requests
• Introduced ITransportClientInterceptor interface and registration mechanism to allow modifying store responses in tests
• Added setGCLSN and setHeaderValue methods to StoreResponse for test-driven header modification

Reviewed Changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
module-info.java	Exports interceptor package to test module
ITransportClientInterceptor.java	New interface defining transport client interceptor contract
TransportClient.java	Implements interceptor registration and applies interceptors to store responses
StoreResponse.java	Adds methods to modify response headers for testing
StoreClient.java	Delegates interceptor registration to replicated resource client
ServerStoreModel.java	Implements interceptor registration interface method
ReplicatedResourceClient.java	Delegates interceptor registration to transport client
BarrierRequestHelper.java	Copies fault injection context to barrier requests
RxStoreModel.java	Adds interceptor registration to interface
RxGatewayStoreModel.java	No-op implementation for gateway mode
RxDocumentClientImpl.java	Delegates interceptor registration to store model
ImplementationBridgeHelpers.java	Adds bridge method for interceptor registration
AsyncDocumentClient.java	Adds interceptor registration to interface
CosmosAsyncClient.java	Implements interceptor registration with bridge helper
FaultInjectionServerErrorRuleOnDirectTests.java	Adds comprehensive test for barrier request fault injection
CosmosTransportClientInterceptor.java	Test implementation of interceptor interface
CosmosInterceptorHelper.java	Test helper for registering interceptors
FaultInjectionRuleProcessor.java	Maps HEAD_COLLECTION to operation and resource types
FaultInjectionOperationType.java	Adds HEAD_COLLECTION operation type

[github-actions]

API Change Check

APIView identified API level changes in this PR and created the following API reviews

com.azure:azure-cosmos

[xinlian12]

/azp run java - cosmos - tests

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[xinlian12]

/azp run java - cosmos - tests

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[xinlian12]

/azp run java - cosmos - tests

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[FabianMeiswinkel]

LGTM - Thx!