go-ethereum: github.com/ethereum/go-ethereum/common/prque Index | Files

package prque

import "github.com/ethereum/go-ethereum/common/prque"

Package prque implements a priority queue data structure supporting arbitrary value types and int64 priorities.

If you would like to use a min-priority queue, simply negate the priorities.

Internally the queue is based on the standard heap package working on a sortable version of the block based stack.

Index

Package Files

lazyqueue.go prque.go sstack.go

type LazyQueue Uses

❖
type LazyQueue struct {
    // contains filtered or unexported fields
}

LazyQueue is a priority queue data structure where priorities can change over time and are only evaluated on demand. Two callbacks are required: - priority evaluates the actual priority of an item - maxPriority gives an upper estimate for the priority in any moment between 

now and the given absolute time

If the upper estimate is exceeded then Update should be called for that item. A global Refresh function should also be called periodically.

func NewLazyQueue Uses

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func NewLazyQueue(setIndex SetIndexCallback, priority PriorityCallback, maxPriority MaxPriorityCallback, clock mclock.Clock, refreshPeriod time.Duration) *LazyQueue

NewLazyQueue creates a new lazy queue

func (*LazyQueue) Empty Uses

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func (q *LazyQueue) Empty() bool

Empty checks whether the priority queue is empty.

func (*LazyQueue) MultiPop Uses

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func (q *LazyQueue) MultiPop(callback func(data interface{}, priority int64) bool)

MultiPop pops multiple items from the queue and is more efficient than calling Pop multiple times. Popped items are passed to the callback. MultiPop returns when the callback returns false or there are no more items to pop.

func (*LazyQueue) Pop Uses

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func (q *LazyQueue) Pop() (interface{}, int64)

Pop removes and returns the item with the greatest actual priority

func (*LazyQueue) PopItem Uses

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func (q *LazyQueue) PopItem() interface{}

PopItem pops the item from the queue only, dropping the associated priority value.

func (*LazyQueue) Push Uses

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func (q *LazyQueue) Push(data interface{})

Push adds an item to the queue

func (*LazyQueue) Refresh Uses

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func (q *LazyQueue) Refresh()

Refresh should be called at least with the frequency specified by the refreshPeriod parameter

func (*LazyQueue) Remove Uses

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func (q *LazyQueue) Remove(index int) interface{}

Remove removes removes the item with the given index.

func (*LazyQueue) Reset Uses

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func (q *LazyQueue) Reset()

Reset clears the contents of the queue

func (*LazyQueue) Size Uses

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func (q *LazyQueue) Size() int

Size returns the number of items in the priority queue.

func (*LazyQueue) Update Uses

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func (q *LazyQueue) Update(index int)

Update updates the upper priority estimate for the item with the given queue index

type MaxPriorityCallback Uses

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type MaxPriorityCallback func(data interface{}, until mclock.AbsTime) int64 // estimated maximum priority callback

type PriorityCallback Uses

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type PriorityCallback func(data interface{}, now mclock.AbsTime) int64 // actual priority callback

type Prque Uses

❖
type Prque struct {
    // contains filtered or unexported fields
}

Priority queue data structure.

func New Uses

❖
func New(setIndex SetIndexCallback) *Prque

New creates a new priority queue.

func (*Prque) Empty Uses

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func (p *Prque) Empty() bool

Checks whether the priority queue is empty.

func (*Prque) Peek Uses

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func (p *Prque) Peek() (interface{}, int64)

Peek returns the value with the greates priority but does not pop it off.

func (*Prque) Pop Uses

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func (p *Prque) Pop() (interface{}, int64)

Pops the value with the greates priority off the stack and returns it. Currently no shrinking is done.

func (*Prque) PopItem Uses

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func (p *Prque) PopItem() interface{}

Pops only the item from the queue, dropping the associated priority value.

func (*Prque) Push Uses

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func (p *Prque) Push(data interface{}, priority int64)

Pushes a value with a given priority into the queue, expanding if necessary.

func (*Prque) Remove Uses

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func (p *Prque) Remove(i int) interface{}

Remove removes the element with the given index.

func (*Prque) Reset Uses

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func (p *Prque) Reset()

Clears the contents of the priority queue.

func (*Prque) Size Uses

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func (p *Prque) Size() int

Returns the number of element in the priority queue.

type SetIndexCallback Uses

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type SetIndexCallback func(data interface{}, index int)

SetIndexCallback is called when the element is moved to a new index. Providing SetIndexCallback is optional, it is needed only if the application needs to delete elements other than the top one.

Package prque imports 3 packages (graph) and is imported by 260 packages. Updated 2020-04-15. Refresh now. Tools for package owners.