use a tmp variable named [isOldProviderGroupEmpty] to resolve the bug…

[shawnliang1124]

djust the location of method called  [closeTransports();] (#1442)

• https://github.com/sofastack/sofa-rpc/issues/1442

Motivation:

there are two bugs in the AbstractCluster.java

1. variable named [oldProviderGroup] will be changed because of the method [addressHolder.updateProviders(providerGroup);], which will not execute method [ closeTransports();]

2. the method of [closeTransports();] should not be contain in the [LOGGER.isWarnEnabled(consumerConfig.getAppName())]

Modification:

1. I use a boolean tmp named [isOldProviderGroupEmpty], avoid the change of [oldProviderGroup]

Result:

Fixes #1442

Summary by CodeRabbit

• Chores
  • Improved code readability in the updateProviders method by reducing redundant checks.
  • Enhanced maintainability without altering functionality or control flow.

[sofastack-cla[bot]]

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Walkthrough

The pull request modifies the updateProviders method in the AbstractCluster class by introducing a boolean variable to enhance code readability. This variable stores the result of checking if the old provider group is empty, reducing redundant method calls. The overall logic and control flow of the method remain unchanged, ensuring consistent behavior while improving clarity and maintainability.

Changes

File	Change Summary
core-impl/client/src/main/java/com/alipay/sofa/rpc/client/AbstractCluster.java	Refactored updateProviders method to introduce a boolean variable for readability.

Sequence Diagram(s)

sequenceDiagram
    participant Consumer
    participant AbstractCluster
    participant ProviderHelper
    participant AddressHolder
    participant ConnectionHolder

    Consumer->>AbstractCluster: updateProviders(providerGroup)
    AbstractCluster->>ProviderHelper: isEmpty(providerGroup)
    alt if providerGroup is empty
        AbstractCluster->>AddressHolder: updateProviders(providerGroup)
        AbstractCluster->>ProviderHelper: isEmpty(oldProviderGroup)
        alt if oldProviderGroup is not empty
            AbstractCluster->>ConnectionHolder: closeTransports()
        end
    else
        AbstractCluster->>AddressHolder: updateProviders(providerGroup)
        AbstractCluster->>ConnectionHolder: updateProviders(providerGroup)
    end

Assessment against linked issues

Objective	Addressed	Explanation
Suggestion to add max retry count in startReconnectThread (1442)	❌	The PR does not address the retry mechanism.
Explanation for design choice in updateProviders method (1442)	❌	The PR does not provide clarification on the design choice.

Possibly related PRs

• #1417: Changes in DefaultProviderBootstrap.java may affect provider management logic.
• #1422: Modifications in MethodConfig.java could influence provider updates.

Suggested labels

bug, cla:yes, size/S

Poem

🐰 In the code where clusters roam,
A boolean shines, a clearer home.
No more calls that waste the day,
Readability leads the way!
With each provider's graceful dance,
Our logic finds a second chance! 🌟

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[EvenLjj]

It has already been fixed in other PRs https://github.com/sofastack/sofa-rpc/pull/1452. Thank you for your feedback.