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89 lines
2.9 KiB
Objective-C
89 lines
2.9 KiB
Objective-C
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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#import <Foundation/Foundation.h>
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NS_ASSUME_NONNULL_BEGIN
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typedef NS_ENUM(NSInteger, OWSOperationState) {
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OWSOperationStateNew,
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OWSOperationStateExecuting,
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OWSOperationStateFinished
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};
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// A base class for implementing retryable operations.
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// To utilize the retryable behavior:
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// Set remainingRetries to something greater than 0, and when you're reporting an error,
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// set `error.isRetryable = YES`.
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// If the failure is one that will not succeed upon retry, set `error.isFatal = YES`.
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//
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// isRetryable and isFatal are opposites but not redundant.
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//
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// If a group message send fails, the send will be retried if any of the errors were retryable UNLESS
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// any of the errors were fatal. Fatal errors trump retryable errors.
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@interface OWSOperation : NSOperation
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@property (readonly, nullable) NSError *failingError;
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// Defaults to 0, set to greater than 0 in init if you'd like the operation to be retryable.
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@property NSUInteger remainingRetries;
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#pragma mark - Mandatory Subclass Overrides
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// Called every retry, this is where the bulk of the operation's work should go.
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- (void)run;
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#pragma mark - Optional Subclass Overrides
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// Called one time only
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- (nullable NSError *)checkForPreconditionError;
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// Called at most one time.
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- (void)didSucceed;
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// Called at most one time.
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- (void)didCancel;
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// Called zero or more times, retry may be possible
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- (void)didReportError:(NSError *)error;
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// Called at most one time, once retry is no longer possible.
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- (void)didFailWithError:(NSError *)error NS_SWIFT_NAME(didFail(error:));
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// How long to wait before retry, if possible
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- (NSTimeInterval)retryInterval;
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#pragma mark - Success/Error - Do Not Override
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// Runs now if a retry timer has been set by a previous failure,
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// otherwise assumes we're currently running and does nothing.
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- (void)runAnyQueuedRetry;
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// Report that the operation completed successfully.
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//
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// Each invocation of `run` must make exactly one call to one of: `reportSuccess`, `reportCancelled`, or `reportError:`
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- (void)reportSuccess;
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// Call this when you abort before completion due to being cancelled.
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//
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// Each invocation of `run` must make exactly one call to one of: `reportSuccess`, `reportCancelled`, or `reportError:`
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- (void)reportCancelled;
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// Report that the operation failed to complete due to an error.
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//
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// Each invocation of `run` must make exactly one call to one of: `reportSuccess`, `reportCancelled`, or `reportError:`
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// You must ensure that `run` cannot succeed after calling `reportError`, e.g. generally you'll write something like
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// this:
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//
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// [self reportError:someError];
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// return;
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//
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// If the error is terminal, and you want to avoid retry, report an error with `error.isFatal = YES` otherwise the
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// operation will retry if possible.
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- (void)reportError:(NSError *)error;
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@end
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NS_ASSUME_NONNULL_END
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