FlutterCallbackCache Class Reference

#import <FlutterCallbackCache.h>

Inheritance diagram for FlutterCallbackCache:

Class Methods
(FlutterCallbackInformation *)	+ lookupCallbackInformation:
(void)	+ setCachePath: [implementation]

Detailed Description

The cache containing callback information for spawning a FlutterHeadlessDartRunner.

Definition at line 37 of file FlutterCallbackCache.h.

Method Documentation

lookupCallbackInformation:

+ (FlutterCallbackInformation *) lookupCallbackInformation:

(int64_t)

handle

Returns the callback information for the given callback handle. This callback information can be used when spawning a FlutterHeadlessDartRunner.

Parameters

handle

The handle for a callback, provided by the Dart method PluginUtilities.getCallbackHandle.

Returns

A FlutterCallbackInformation object which contains the name of the callback, the name of the class in which the callback is defined, and the path of the library which contains the callback. If the provided handle is invalid, nil is returned.

Definition at line 10 of file FlutterCallbackCache.mm.

                                                        :(int64_t)handle {
  auto info = flutter::DartCallbackCache::GetCallbackInformation(handle);
  if (info == nullptr) {
    return nil;
  }
  FlutterCallbackInformation* new_info = [[FlutterCallbackInformation alloc] init];
  new_info.callbackName = [NSString stringWithUTF8String:info->name.c_str()];
  new_info.callbackClassName = [NSString stringWithUTF8String:info->class_name.c_str()];
  new_info.callbackLibraryPath = [NSString stringWithUTF8String:info->library_path.c_str()];
  return new_info;
}

setCachePath:

+ (void) setCachePath: (NSString*)  path

implementation

Definition at line 10 of file FlutterCallbackCache.mm.

                    :(NSString*)path {
  FML_DCHECK(path != nil);
  flutter::DartCallbackCache::SetCachePath([path UTF8String]);
  NSString* cache_path =
      [NSString stringWithUTF8String:flutter::DartCallbackCache::GetCachePath().c_str()];
  // Set the "Do Not Backup" flag to ensure that the cache isn't moved off disk in
  // low-memory situations.
  if (![[NSFileManager defaultManager] fileExistsAtPath:cache_path]) {
    [[NSFileManager defaultManager] createFileAtPath:cache_path contents:nil attributes:nil];
    NSError* error = nil;
    NSURL* URL = [NSURL fileURLWithPath:cache_path];
    BOOL success = [URL setResourceValue:[NSNumber numberWithBool:YES]
                                  forKey:NSURLIsExcludedFromBackupKey
                                   error:&error];
    if (!success) {
      NSLog(@"Error excluding %@ from backup %@", [URL lastPathComponent], error);
    }
  }
}

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The documentation for this class was generated from the following files:

• shell/platform/darwin/ios/framework/Headers/FlutterCallbackCache.h
• shell/platform/darwin/ios/framework/Source/FlutterCallbackCache.mm