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84 lines
2.1 KiB
Go
84 lines
2.1 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package concurrency
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// Future is a result type of async-await style.
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// It contains the result (or error) of an async task.
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// Trying to obtain the result (or error) blocks until the async task completes.
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type Future struct {
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ch chan struct{}
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value interface{}
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err error
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}
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func newFuture() *Future {
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return &Future{
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ch: make(chan struct{}),
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}
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}
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// Return the result and error of the async task.
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func (future *Future) Await() (interface{}, error) {
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<-future.ch
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return future.value, future.err
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}
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// Return the result of the async task,
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// nil if no result or error occurred.
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func (future *Future) Value() interface{} {
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<-future.ch
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return future.value
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}
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// False if error occurred,
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// true otherwise.
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func (future *Future) OK() bool {
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<-future.ch
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return future.err == nil
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}
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// Return the error of the async task,
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// nil if no error.
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func (future *Future) Err() error {
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<-future.ch
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return future.err
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}
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// Return a read-only channel,
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// which will be closed if the async task completes.
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// Use this if you need to wait the async task in a select statement.
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func (future *Future) Inner() <-chan struct{} {
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return future.ch
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}
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// Await for multiple futures,
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// Return nil if no future returns error,
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// or return the first error in these futures.
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func AwaitAll(futures ...*Future) error {
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for i := range futures {
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if !futures[i].OK() {
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return futures[i].err
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}
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}
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return nil
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}
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