forked from Workiva/go-datastructures
/
action.go
215 lines (170 loc) · 3.87 KB
/
action.go
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/*
Copyright 2014 Workiva, LLC
Licensed 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 palm
import (
"runtime"
"sync"
"sync/atomic"
"github.com/Workiva/go-datastructures/common"
)
type actions []action
type action interface {
operation() operation
keys() common.Comparators
complete()
addNode(int64, *node)
nodes() []*node
}
type getAction struct {
result common.Comparators
completer *sync.WaitGroup
}
func (ga *getAction) complete() {
ga.completer.Done()
}
func (ga *getAction) operation() operation {
return get
}
func (ga *getAction) keys() common.Comparators {
return ga.result
}
func (ga *getAction) addNode(i int64, n *node) {
return // not necessary for gets
}
func (ga *getAction) nodes() []*node {
return nil
}
func newGetAction(keys common.Comparators) *getAction {
result := make(common.Comparators, len(keys))
copy(result, keys) // don't want to mutate passed in keys
ga := &getAction{
result: result,
completer: new(sync.WaitGroup),
}
ga.completer.Add(1)
return ga
}
type insertAction struct {
result common.Comparators
completer *sync.WaitGroup
ns []*node
}
func (ia *insertAction) complete() {
ia.completer.Done()
}
func (ia *insertAction) operation() operation {
return add
}
func (ia *insertAction) keys() common.Comparators {
return ia.result
}
func (ia *insertAction) addNode(i int64, n *node) {
ia.ns[i] = n
}
func (ia *insertAction) nodes() []*node {
return ia.ns
}
func newInsertAction(keys common.Comparators) *insertAction {
result := make(common.Comparators, len(keys))
copy(result, keys)
ia := &insertAction{
result: result,
completer: new(sync.WaitGroup),
ns: make([]*node, len(keys)),
}
ia.completer.Add(1)
return ia
}
type removeAction struct {
*insertAction
}
func (ra *removeAction) operation() operation {
return remove
}
func newRemoveAction(keys common.Comparators) *removeAction {
return &removeAction{
newInsertAction(keys),
}
}
type applyAction struct {
fn func(common.Comparator) bool
start, stop common.Comparator
completer *sync.WaitGroup
}
func (aa *applyAction) operation() operation {
return apply
}
func (aa *applyAction) nodes() []*node {
return nil
}
func (aa *applyAction) addNode(i int64, n *node) {}
func (aa *applyAction) keys() common.Comparators {
return nil
}
func (aa *applyAction) complete() {
aa.completer.Done()
}
func newApplyAction(fn func(common.Comparator) bool, start, stop common.Comparator) *applyAction {
aa := &applyAction{
fn: fn,
start: start,
stop: stop,
completer: new(sync.WaitGroup),
}
aa.completer.Add(1)
return aa
}
func minUint64(choices ...uint64) uint64 {
min := choices[0]
for i := 1; i < len(choices); i++ {
if choices[i] < min {
min = choices[i]
}
}
return min
}
type interfaces []interface{}
func executeInterfacesInParallel(ifs interfaces, fn func(interface{})) {
if len(ifs) == 0 {
return
}
done := int64(-1)
numCPU := uint64(runtime.NumCPU())
if numCPU > 1 {
numCPU--
}
numCPU = minUint64(numCPU, uint64(len(ifs)))
var wg sync.WaitGroup
wg.Add(int(numCPU))
for i := uint64(0); i < numCPU; i++ {
go func() {
defer wg.Done()
for {
i := atomic.AddInt64(&done, 1)
if i >= int64(len(ifs)) {
return
}
fn(ifs[i])
}
}()
}
wg.Wait()
}
func executeInterfacesInSerial(ifs interfaces, fn func(interface{})) {
if len(ifs) == 0 {
return
}
for _, ifc := range ifs {
fn(ifc)
}
}