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90 lines
4.1 KiB
Go
90 lines
4.1 KiB
Go
// The MIT License
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//
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// Copyright (c) 2020 Temporal Technologies Inc. All rights reserved.
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//
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// Copyright (c) 2020 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package workflow
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import (
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"go.temporal.io/sdk/internal"
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)
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// Context is a clone of context.Context with Done() returning Channel instead
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// of native channel.
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// A Context carries a deadline, a cancellation signal, and other values across
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// API boundaries.
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//
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// Context's methods may be called by multiple goroutines simultaneously.
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type Context = internal.Context
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// ContextAware is an optional interface that can be implemented alongside
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// DataConverter. This interface allows Temporal to pass Workflow/Activity
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// contexts to the DataConverter so that it may tailor it's behaviour.
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//
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// Note that data converters may be called in non-context-aware situations to
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// convert payloads that may not be customized per context. Data converter
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// implementers should not expect or require contextual data be present.
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type ContextAware = internal.ContextAware
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// ErrCanceled is the error returned by Context.Err when the context is canceled.
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var ErrCanceled = internal.ErrCanceled
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// ErrDeadlineExceeded is the error returned by Context.Err when the context's
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// deadline passes.
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var ErrDeadlineExceeded = internal.ErrDeadlineExceeded
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// A CancelFunc tells an operation to abandon its work.
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// A CancelFunc does not wait for the work to stop.
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// After the first call, subsequent calls to a CancelFunc do nothing.
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type CancelFunc = internal.CancelFunc
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// WithCancel returns a copy of parent with a new Done channel. The returned
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// context's Done channel is closed when the returned cancel function is called
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// or when the parent context's Done channel is closed, whichever happens first.
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//
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// Canceling this context releases resources associated with it, so code should
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// call cancel as soon as the operations running in this Context complete.
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func WithCancel(parent Context) (ctx Context, cancel CancelFunc) {
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return internal.WithCancel(parent)
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}
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// WithValue returns a copy of parent in which the value associated with key is
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// val.
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//
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// Use context Values only for request-scoped data that transits processes and
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// APIs, not for passing optional parameters to functions.
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func WithValue(parent Context, key interface{}, val interface{}) Context {
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return internal.WithValue(parent, key, val)
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}
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// NewDisconnectedContext returns a new context that won't propagate parent's cancellation to the new child context.
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// One common use case is to do cleanup work after workflow is canceled.
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// err := workflow.ExecuteActivity(ctx, ActivityFoo).Get(ctx, &activityFooResult)
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// if err != nil && temporal.IsCanceledError(ctx.Err()) {
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// // activity failed, and workflow context is canceled
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// disconnectedCtx, _ := workflow.newDisconnectedContext(ctx);
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// workflow.ExecuteActivity(disconnectedCtx, handleCancellationActivity).Get(disconnectedCtx, nil)
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// return err // workflow return CanceledError
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// }
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func NewDisconnectedContext(parent Context) (ctx Context, cancel CancelFunc) {
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return internal.NewDisconnectedContext(parent)
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}
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