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Move setBridge: off main thread

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Summary:
Previously, if a module implemented `setBridge:` we assumed that it needs to be initialised on the main thread. This assumption was not really warranted however, and it was a barrier to deferring module initialization.

This diff tweaks the rules so that only modules that override `init` or `constantsToExport**` are assumed to require main thread initialization, and others can be created lazily when they are first used.

WARNING: this will be a breaking change to any 3rd party modules that are assuming `setBridge:` is called on the main thread. Those modules should be rewritten to move any code that requires the main thread into `init` or `constantsToExport` instead.

`**` We will also be examining whether `constantsToExport` can be done lazily, but for now any module that uses it will still be created eagerly when the bridge starts up.

Reviewed By: javache

Differential Revision: D3240682

fb-gh-sync-id: 48f309e3158bbccb52141032baf70def3e609371
fbshipit-source-id: 48f309e3158bbccb52141032baf70def3e609371
This commit is contained in:
Nick Lockwood
2016-05-03 09:08:03 -07:00
committed by Facebook Github Bot 4
parent 55c8158c44
commit 34ec6a91a9
8 changed files with 55 additions and 28 deletions
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12
React/Base/RCTModuleData.m
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@@ -37,19 +37,15 @@
_instanceLock = [NSLock new];
static IMP objectInitMethod;
static SEL setBridgeSelector;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
objectInitMethod = [NSObject instanceMethodForSelector:@selector(init)];
setBridgeSelector = NSSelectorFromString(@"setBridge:");
});
// If a module overrides `init`, `setBridge:` then we must assume that it
// expects for both of those methods to be called on the main thread, because
// they may need to access UIKit.
_requiresMainThreadSetup =
[_moduleClass instancesRespondToSelector:setBridgeSelector] ||
(!_instance && [_moduleClass instanceMethodForSelector:@selector(init)] != objectInitMethod);
// If a module overrides `init` then we must assume that it expects to be
// initialized on the main thread, because it may need to access UIKit.
_requiresMainThreadSetup = !_instance &&
[_moduleClass instanceMethodForSelector:@selector(init)] != objectInitMethod;
// If a module overrides `constantsToExport` then we must assume that it
// must be called on the main thread, because it may need to access UIKit.