perf: speed up the first loading of namespace when startup meet 404

[Anilople]

What's the purpose of this PR

Speed up the user's startup time,

by decrease the number of http requests.

Which issue(s) this PR fixes:

Fixes https://github.com/apolloconfig/apollo-java/issues/60

Brief changelog

before change, it use 11494 ms to load 10 namespace when meet 404, before-change.log

after delete 2 http requests when context init, it use 1490 ms. after-change.log

i.e from 11494 ms to 1490 ms.

the code in https://github.com/apolloconfig/apollo-java/blob/bcc40531f32e74d0c639b5e5d2ab2995fd00c3d6/apollo-client/src/main/java/com/ctrip/framework/apollo/internals/DefaultConfig.java#L69 will ensure pull at least one time from remote when startup.

Follow this checklist to help us incorporate your contribution quickly and easily:

• [x] Read the Contributing Guide before making this pull request.
• [x] Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• [x] Write necessary unit tests to verify the code.
• [x] Run mvn clean test to make sure this pull request doesn't break anything.
• [x] Update the CHANGES log.

Summary by CodeRabbit

• New Features

  • Introduced a new initialization process in the configuration repository, enhancing the setup mechanism.

• Bug Fixes

  • Adjusted initialization calls to ensure proper configuration setup without redundant sync calls.

• Tests

  • Added assertions in tests to verify the source type before and after initialization, improving test coverage and reliability.

[coderabbitai[bot]]

Walkthrough

The recent changes in the apollo-client module primarily focus on improving the initialization process to speed up the user's startup time. The changes include adding an initialize() method to various classes and interfaces, modifying constructors to avoid initial synchronization calls, and updating tests to reflect these changes.

Changes

File Path	Change Summary
apollo-client/src/main/java/com/ctrip/framework/apollo/internals/AbstractConfigRepository.java	Added initialize() method to call sync().
apollo-client/src/main/java/com/ctrip/framework/apollo/internals/ConfigRepository.java	Added default initialize() method to the interface.
apollo-client/src/main/java/com/ctrip/framework/apollo/internals/DefaultConfig.java	Added call to m_configRepository.initialize() in initialize() method.
apollo-client/src/main/java/com/ctrip/framework/apollo/internals/LocalFileConfigRepository.java	Commented out trySync() call in the constructor.
apollo-client/src/main/java/com/ctrip/framework/apollo/internals/RemoteConfigRepository.java	Commented out trySync() call in the constructor.
apollo-client/src/test/java/com/ctrip/framework/apollo/internals/LocalFileConfigRepositoryTest.java	Added assertion to check source type before and after initialization in testOnRepositoryChange.

Assessment against linked issues

Objective (Issue #60)	Addressed	Explanation
Speed up user's startup time by reducing IO calls	✅
Fast fail when encountering errors	✅

In the land of code where rabbits play, Initialization now speeds the way. Sync calls deferred, constructors light, Users' startup times take flight. With tests to check, and code so bright, Apollo's changes feel just right. 🐇✨

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