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pipeline.go
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pipeline.go
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/*
* Copyright (C) 2015 Red Hat, Inc.
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package flow
// Enhancer should Enhance the flow via this interface
type Enhancer interface {
Name() string
Start() error
Stop()
}
// EnhancerPipeline describes a list of flow enhancer
type EnhancerPipeline struct {
Enhancers map[string]Enhancer
}
// EnhancerPipelineConfig describes configuration of enabled enhancers
type EnhancerPipelineConfig struct {
enabled map[string]bool
}
// NewEnhancerPipelineConfig create a new enhancer pipeline config
func NewEnhancerPipelineConfig() *EnhancerPipelineConfig {
return &EnhancerPipelineConfig{enabled: make(map[string]bool)}
}
// Disable the named enhancer
func (epc *EnhancerPipelineConfig) Disable(name string) {
epc.enabled[name] = false
}
// Enable the named enhancer
func (epc *EnhancerPipelineConfig) Enable(name string) {
epc.enabled[name] = true
}
// IsEnabled return true if the named enhancer
func (epc *EnhancerPipelineConfig) IsEnabled(name string) bool {
v, ok := epc.enabled[name]
if !ok {
return true
}
return v
}
// Start starts all the enhancers
func (e *EnhancerPipeline) Start() {
for _, enhancer := range e.Enhancers {
enhancer.Start()
}
}
// Stop stops all the enhancers
func (e *EnhancerPipeline) Stop() {
for _, enhancer := range e.Enhancers {
enhancer.Stop()
}
}
// AddEnhancer registers a new flow enhancer
func (e *EnhancerPipeline) AddEnhancer(en Enhancer) {
e.Enhancers[en.Name()] = en
}
// NewEnhancerPipeline registers a list of flow Enhancer
func NewEnhancerPipeline(enhancers ...Enhancer) *EnhancerPipeline {
ep := &EnhancerPipeline{
Enhancers: make(map[string]Enhancer),
}
for _, en := range enhancers {
ep.AddEnhancer(en)
}
return ep
}