Design and implementation of function cache in golang concurrency mode

In order to implement function caching in Go's concurrent environment, you can follow the following steps: Define a Cache interface containing Get and Set methods. Use sync.Map to implement a syncMapCache structure, which implements the Cache interface and stores cache data. Register cache handling functions for different functions. Using sync.MapCache, you can cache function calculation results, such as the Fibonacci sequence, to effectively improve program performance.

Go function cache design and implementation in concurrent mode

In Go's concurrent programming environment, it is often necessary to cache some calculations results to improve performance. By saving the results of repeated calculations in the cache, unnecessary repeated calculations can be avoided, thereby significantly improving program running efficiency.

Goroutine Safe Function Cache

In order to implement safe function caching in concurrent mode, you can use the sync.Map type. sync.Map is a concurrency-safe key-value mapping, which can ensure that data competition problems will not occur during concurrent access.

Design

The design of function cache consists of the following steps:

1. Define a Cache interface, which contains A Get method and a Set method of function type.
2. Implement a sync.MapCache structure, which implements the Cache interface and uses sync.Map to internally store cache data.
3. Register cache handling functions for different functions.

Implementation

The following is the implementation of sync.MapCache:

import (
    "sync"

    "github.com/golang/sync/syncmap"
)

type Cache interface {
    Get(key interface{}) (interface{}, bool)
    Set(key, value interface{})
}

type syncMapCache struct {
    syncmap.Map
}

func (c *syncMapCache) Get(key interface{}) (interface{}, bool) {
    return c.Load(key)
}

func (c *syncMapCache) Set(key, value interface{}) {
    c.Store(key, value)
}

Practical case

The following is an example of using syncMapCache to cache the results of a Fibonacci sequence calculation:

package main

import (
    "fmt"
    "math/big"

    "github.com/fatih/structs"
)

type fibonacciKey struct {
    n int
}

func (k fibonacciKey) String() string {
    return structs.Name(k)
}

var fibCache = &syncMapCache{}

func fibonacci(n int) *big.Int {
    if n <= 1 {
        return big.NewInt(int64(n))
    }

    key := fibonacciKey{n}
    if fib, ok := fibCache.Get(key); ok {
        return fib.(*big.Int)
    }

    fib := fibonacci(n-1).Add(fibonacci(n-2), nil)
    fibCache.Set(key, fib)

    return fib
}

func main() {
    for i := 0; i < 10; i++ {
        fmt.Println(fibonacci(i))
    }
}

Summary

Passed Using the sync.Map type of concurrency safety features, a reliable and efficient function cache can be implemented. This helps avoid unnecessary duplication of calculations, thereby improving program performance in concurrent mode.

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