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//
// WKJavaScriptMessageDispatcher.m
// WKJavaScriptBridge-demo
//
// Created by Kevin on 2019/10/22.
// Copyright © 2019 王凯. All rights reserved.
//
#import "WKJavaScriptMessageDispatcher.h"
#import "WKMsgCommand.h"
#import "WKJavaScriptBridge.h"
#import "WKBasePlugin.h"
#import "NSString+BridgeJSONPrivate.h"
#import <objc/message.h>
static const NSInteger JSON_SIZE_FOR_MAIN_THREAD = 4 * 1024; // Chosen arbitrarily.
@implementation WKJavaScriptMessageDispatcher {
__weak WKJavaScriptBridge *_bridge;
NSDictionary *_commandDictionary;
}
- (instancetype)initWithBridge:(WKJavaScriptBridge *)bridge {
if (self = [super init]) {
_bridge = bridge;
_commandDictionary = [NSDictionary dictionary];
}
return self;
}
- (void)handleMsgCommand:(NSString *)arguments {
[self handleCommand:arguments];
}
#pragma mark - handle
- (void)handleCommand:(NSString *)commandJson {
if (commandJson.length > 0) {
[self fetchCommands:commandJson];
[self executePending];
}
}
- (void)fetchCommands:(NSString *)command {
if ([command length] < JSON_SIZE_FOR_MAIN_THREAD) {
_commandDictionary = [command bridge_JSONObject];
} else {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^() {
self->_commandDictionary = [command bridge_JSONObject];
[self performSelectorOnMainThread:@selector(executePending) withObject:nil waitUntilDone:NO];
});
}
}
- (void)executePending {
if (_commandDictionary.allKeys.count > 0) {
WKMsgCommand *msgCommand = [WKMsgCommand commandFromJson:_commandDictionary];
#ifdef DEBUG
NSLog(@"WKJavaScriptBridge(%@): Calling %@.%@", msgCommand.callbackId, msgCommand.className, msgCommand.methodName);
#endif
if (![self execute:msgCommand]) {
#ifdef DEBUG
NSString *commandJson = [NSString stringWithFormat:@"%@",_commandDictionary];
static NSUInteger maxLogLength = 1024;
NSString *commandString = ([commandJson length] > maxLogLength) ?
[NSString stringWithFormat : @"%@[...]", [commandJson substringToIndex:maxLogLength]] :
commandJson;
NSLog(@"WKJavaScriptBridge Error : FAILED pluginJSON = %@", commandString);
#endif
}
}
}
- (BOOL)execute:(WKMsgCommand *)command {
if (command.className == nil || command.methodName == nil) {
#ifdef DEBUG
NSLog(@"WKJavaScriptBridge Error : 调用的类名或方法名不存在。");
#endif
return NO;
}
BOOL retVal = YES;
double started = [[NSDate date] timeIntervalSince1970] * 1000.0;
WKBasePlugin *instance = [_bridge getCommandInstance:command.className];
if (!([instance isKindOfClass:[WKBasePlugin class]])) {
#ifdef DEBUG
NSLog(@"WKJavaScriptBridge Error : 模块 '%@' 异常, 检查此模块是否继承于（WKBasePlugin）", command.className);
#endif
return NO;
}
NSString* methodName = [NSString stringWithFormat:@"%@:", command.methodName];
SEL normalSelector = NSSelectorFromString(methodName);
if ([instance respondsToSelector:normalSelector]) {
((void (*)(id, SEL, id))objc_msgSend)(instance, normalSelector, command);
} else {
#ifdef DEBUG
NSLog(@"WKJavaScriptBridge Error : 函数 '%@' 在类 '%@' 中没有找到。", methodName, command.className);
#endif
retVal = NO;
}
double elapsed = [[NSDate date] timeIntervalSince1970] * 1000.0 - started;
if (elapsed > 10) {
#ifdef DEBUG
NSLog(@"WKJavaScriptBridge THREAD WARNING: ['%@'] 占用了 '%f' ms。请使用（runInBackground:）将此插件放到后台执行。", command.className, elapsed);
#endif
}
return retVal;
}
- (void)dealloc {
_bridge = nil;
}
@end