Fix collection performance anti-patterns and ChannelContext logic bugs

[Copilot]

Audit of core modules for performance and correctness issues.

Performance fixes

• size() == 0 → isEmpty() across 6 files — isEmpty() is O(1) for all collections; size() is O(n) for ConcurrentLinkedQueue (used in BatchExecutorQueue)
• Remove redundant Collections.synchronizedMap(new ConcurrentHashMap<>()) in RouterChain — double-wrapping negates ConcurrentHashMap's striped locking with a single coarse mutex
• Eliminate containsKey() + get() double-lookup in ChannelContext.invalidateHeadCache() — single get() with null check

Logic bug fix

• ChannelContext.invalidateHeadCache(Byte key, ...) → Short key — the backing TwoWayMap<Short, String> uses Short keys, so Byte lookups via Map.get(Object) never matched, making the method silently no-op:

// Before: Byte ≠ Short, containsKey/get always returns false/null
public void invalidateHeadCache(Byte key, String value) { ... }

// After: types align with TwoWayMap<Short, String>
public void invalidateHeadCache(Short key, String value) { ... }

Tests

• Added ChannelContextTest (12 cases) covering cache put/get, invalidation (success, mismatch, missing key, null cache), ref index allocation, and property accessors. Previously had zero coverage.

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[Copilot]

Pull request overview

This PR audits several core modules to fix collection performance anti-patterns and a logic bug in ChannelContext.

Changes:

• isEmpty() replacements: Replaces size() == 0 with isEmpty() across 6 files (AbstractHttpServer, LocalRegistry, BatchExecutorQueue, RpcConfigs, BeanIdMatchFilter, AbstractLoadBalancer) for idiomatic and potentially more performant checks.
• RouterChain simplification: Removes the redundant Collections.synchronizedMap() wrapper around ConcurrentHashMap for PROVIDER_AUTO_ACTIVES and CONSUMER_AUTO_ACTIVES (safe since iterations over these maps are followed by a sort-by-order step).
• ChannelContext bug fix: Corrects invalidateHeadCache's parameter type from Byte to Short (matching the TwoWayMap<Short, String> backing), eliminates the containsKey + get double-lookup, and adds a new ChannelContextTest covering 12 cases.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
AbstractHttpServer.java	size() == 0 → isEmpty() in unRegisterProcessor
LocalRegistry.java	size() == 0 → isEmpty() in unSubscribe
BatchExecutorQueue.java	size() == 0 → isEmpty() on snapshot (a LinkedList) in run()
RpcConfigs.java	size() == 0 → isEmpty() in unSubscribe
RouterChain.java	Removes Collections.synchronizedMap() double-wrapping around ConcurrentHashMap
BeanIdMatchFilter.java	size() == 0 → isEmpty() in isMatch
AbstractLoadBalancer.java	size() == 0 → isEmpty() in select
ChannelContext.java	Fixes invalidateHeadCache parameter type Byte → Short and eliminates containsKey+get double-lookup
ChannelContextTest.java	New 12-case unit test class covering cache operations and ChannelContext accessors

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Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.

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