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105 lines
2.8 KiB
Go
105 lines
2.8 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 lifetime provides common component lifetime control logic.
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package lifetime
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import (
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"sync"
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)
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// Lifetime interface for lifetime control.
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type Lifetime[T any] interface {
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SafeChan
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// SetState is the method to change lifetime state.
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SetState(state T)
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// GetState returns current state.
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GetState() T
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// Add records a task is running, returns false if the lifetime is not healthy.
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Add(isHealthy CheckHealth[T]) error
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// Done records a task is done.
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Done()
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// Wait waits until all tasks are done.
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Wait()
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}
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// CheckHealth function type for lifetime healthy check.
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type CheckHealth[T any] func(T) error
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var _ Lifetime[any] = (*lifetime[any])(nil)
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// NewLifetime returns a new instance of Lifetime with init state and isHealthy logic.
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func NewLifetime[T any](initState T) Lifetime[T] {
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return &lifetime[T]{
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safeChan: newSafeChan(),
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state: initState,
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}
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}
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// lifetime implementation of Lifetime.
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// users shall not care about the internal fields of this struct.
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type lifetime[T any] struct {
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*safeChan
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// wg is used for keeping record each running task.
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wg sync.WaitGroup
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// state is the "atomic" value to store component state.
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state T
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// mut is the rwmutex to control each task and state change event.
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mut sync.RWMutex
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// isHealthy is the method to check whether is legal to add a task.
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isHealthy func(int32) error
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}
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// SetState is the method to change lifetime state.
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func (l *lifetime[T]) SetState(state T) {
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l.mut.Lock()
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defer l.mut.Unlock()
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l.state = state
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}
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// GetState returns current state.
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func (l *lifetime[T]) GetState() T {
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l.mut.RLock()
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defer l.mut.RUnlock()
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return l.state
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}
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// Add records a task is running, returns false if the lifetime is not healthy.
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func (l *lifetime[T]) Add(checkHealth CheckHealth[T]) error {
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l.mut.RLock()
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defer l.mut.RUnlock()
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// check lifetime healthy
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if err := checkHealth(l.state); err != nil {
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return err
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}
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l.wg.Add(1)
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return nil
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}
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// Done records a task is done.
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func (l *lifetime[T]) Done() {
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l.wg.Done()
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}
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// Wait waits until all tasks are done.
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func (l *lifetime[T]) Wait() {
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l.wg.Wait()
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}
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