gf/os/gcache/gcache_z_example_cache_test.go

package gcache_test

import (
	"fmt"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/os/gcache"
	"time"
)

func ExampleNew() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	// Set cache without expiration
	c.Set(ctx, "k1", "v1", 0)

	// Get cache
	v, _ := c.Get(ctx, "k1")
	fmt.Println(v)

	// Get cache size
	n, _ := c.Size(ctx)
	fmt.Println(n)

	// Does the specified key name exist in the cache
	b, _ := c.Contains(ctx, "k1")
	fmt.Println(b)

	// Delete and return the deleted key value
	fmt.Println(c.Remove(ctx, "k1"))

	// Close the cache object and let the GC reclaim resources

	c.Close(ctx)

	// Output:
	// v1
	// 1
	// true
	// v1 <nil>
}

func ExampleCache_Set() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	// Set cache without expiration
	c.Set(ctx, "k1", g.Slice{1, 2, 3, 4, 5, 6, 7, 8, 9}, 0)

	// Get cache
	fmt.Println(c.Get(ctx, "k1"))

	// Output:
	// [1,2,3,4,5,6,7,8,9] <nil>
}

func ExampleCache_SetAdapters() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	// SetAdapter changes the adapter for this cache. Be very note that, this setting function is not concurrent-safe,
	// which means you should not call this setting function concurrently in multiple goroutines.
	adapter := gcache.New()
	c.SetAdapter(adapter)

	// Set cache
	c.Set(ctx, "k1", g.Slice{1, 2, 3, 4, 5, 6, 7, 8, 9}, 0)

	// Reverse makes array with elements in reverse order.
	fmt.Println(c.Get(ctx, "k1"))

	// Output:
	// [1,2,3,4,5,6,7,8,9] <nil>
}

func ExampleCache_SetIfNotExist() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	// Write when the key name does not exist, and set the expiration time to 1000 milliseconds
	k1, err := c.SetIfNotExist(ctx, "k1", "v1", 1000*time.Millisecond)
	fmt.Println(k1, err)

	// Returns false when the key name already exists
	k2, err := c.SetIfNotExist(ctx, "k1", "v2", 1000*time.Millisecond)
	fmt.Println(k2, err)

	// Print the current list of key values
	keys1, _ := c.Keys(ctx)
	fmt.Println(keys1)

	// It does not expire if `duration` == 0. It deletes the `key` if `duration` < 0 or given `value` is nil.
	c.SetIfNotExist(ctx, "k1", 0, -10000)

	// Wait 1 second for K1: V1 to expire automatically
	time.Sleep(1200 * time.Millisecond)

	// Print the current key value pair again and find that K1: V1 has expired
	keys2, _ := c.Keys(ctx)
	fmt.Println(keys2)

	// Output:
	// true <nil>
	// false <nil>
	// [k1]
	// [<nil>]
}

func ExampleCache_SetMap() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	// map[interface{}]interface{}
	data := g.MapAnyAny{
		"k1": "v1",
		"k2": "v2",
		"k3": "v3",
	}

	// Sets batch sets cache with key-value pairs by `data`, which is expired after `duration`.
	// It does not expire if `duration` == 0. It deletes the keys of `data` if `duration` < 0 or given `value` is nil.
	c.SetMap(ctx, data, 1000*time.Millisecond)

	// Gets the specified key value
	v1, _ := c.Get(ctx, "k1")
	v2, _ := c.Get(ctx, "k2")
	v3, _ := c.Get(ctx, "k3")

	fmt.Println(v1, v2, v3)

	// Output:
	// v1 v2 v3
}

func ExampleCache_Size() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	// Add 10 elements without expiration
	for i := 0; i < 10; i++ {
		c.Set(ctx, i, i, 0)
	}

	// Size returns the number of items in the cache.
	n, _ := c.Size(ctx)
	fmt.Println(n)

	// Output:
	// 10
}

func ExampleCache_Update() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	// Sets batch sets cache with key-value pairs by `data`, which is expired after `duration`.
	// It does not expire if `duration` == 0. It deletes the keys of `data` if `duration` < 0 or given `value` is nil.
	c.SetMap(ctx, g.MapAnyAny{"k1": "v1", "k2": "v2", "k3": "v3"}, 0)

	// Print the current key value pair
	k1, _ := c.Get(ctx, "k1")
	fmt.Println(k1)
	k2, _ := c.Get(ctx, "k2")
	fmt.Println(k2)
	k3, _ := c.Get(ctx, "k3")
	fmt.Println(k3)

	// Update updates the value of `key` without changing its expiration and returns the old value.
	re, exist, _ := c.Update(ctx, "k1", "v11")
	fmt.Println(re, exist)

	// The returned value `exist` is false if the `key` does not exist in the cache.
	// It does nothing if `key` does not exist in the cache.
	re1, exist1, _ := c.Update(ctx, "k4", "v44")
	fmt.Println(re1, exist1)

	kup1, _ := c.Get(ctx, "k1")
	fmt.Println(kup1)
	kup2, _ := c.Get(ctx, "k2")
	fmt.Println(kup2)
	kup3, _ := c.Get(ctx, "k3")
	fmt.Println(kup3)

	// Output:
	// v1
	// v2
	// v3
	// v1 true
	//  false
	// v11
	// v2
	// v3
}

func ExampleCache_UpdateExpire() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	c.Set(ctx, "k1", "v1", 1000*time.Millisecond)
	expire, _ := c.GetExpire(ctx, "k1")
	fmt.Println(expire)

	// UpdateExpire updates the expiration of `key` and returns the old expiration duration value.
	// It returns -1 and does nothing if the `key` does not exist in the cache.
	c.UpdateExpire(ctx, "k1", 500*time.Millisecond)

	expire1, _ := c.GetExpire(ctx, "k1")
	fmt.Println(expire1)

	// Output:
	// 1s
	// 500ms
}

func ExampleCache_Values() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	// Write value
	c.Set(ctx, "k1", g.Map{"k1": "v1", "k2": "v2"}, 0)
	// c.Set(ctx, "k2", "Here is Value2", 0)
	// c.Set(ctx, "k3", 111, 0)

	// Values returns all values in the cache as slice.
	data, _ := c.Values(ctx)
	fmt.Println(data)

	// May Output:
	// [map[k1:v1 k2:v2]]
}

func ExampleCache_Close() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	// Set Cache
	c.Set(ctx, "k1", "v", 0)
	data, _ := c.Get(ctx, "k1")
	fmt.Println(data)

	// Close closes the cache if necessary.
	c.Close(ctx)

	data1, _ := c.Get(ctx, "k1")

	fmt.Println(data1)

	// Output:
	// v
	// v

}

func ExampleCache_Contains() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	// Set Cache
	c.Set(ctx, "k", "v", 0)

	// Contains returns true if `key` exists in the cache, or else returns false.
	// return true
	data, _ := c.Contains(ctx, "k")
	fmt.Println(data)

	// return false
	data1, _ := c.Contains(ctx, "k1")
	fmt.Println(data1)

	// Output:
	// true
	// false

}

func ExampleCache_Data() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	c.SetMap(ctx, g.MapAnyAny{"k1": "v1", "k2": "v2"}, 0)
	c.Set(ctx, "k5", "v5", 0)

	// Get retrieves and returns the associated value of given `key`.
	// It returns nil if it does not exist, its value is nil or it's expired.
	data, _ := c.Get(ctx, "k1")
	fmt.Println(data)

	data1, _ := c.Get(ctx, "k2")
	fmt.Println(data1)

	data2, _ := c.Get(ctx, "k5")
	fmt.Println(data2)

	// Output:
	// v1
	// v2
	// v5
}

func ExampleCache_Get() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	// Set Cache Object
	c.Set(ctx, "k1", "v1", 0)

	// Get retrieves and returns the associated value of given `key`.
	// It returns nil if it does not exist, its value is nil or it's expired.
	data, _ := c.Get(ctx, "k1")
	fmt.Println(data)

	// Output:
	// v1
}

func ExampleCache_GetExpire() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	// Set cache without expiration
	c.Set(ctx, "k", "v", 10000*time.Millisecond)

	// GetExpire retrieves and returns the expiration of `key` in the cache.
	// It returns 0 if the `key` does not expire. It returns -1 if the `key` does not exist in the cache.
	expire, _ := c.GetExpire(ctx, "k")
	fmt.Println(expire)

	// Output:
	// 10s
}

func ExampleCache_GetOrSet() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	// GetOrSet retrieves and returns the value of `key`, or sets `key`-`value` pair and returns `value`
	// if `key` does not exist in the cache.
	data, _ := c.GetOrSet(ctx, "k", "v", 10000*time.Millisecond)
	fmt.Println(data)

	data1, _ := c.Get(ctx, "k")
	fmt.Println(data1)

	// Output:
	// v
	// v

}

func ExampleCache_GetOrSetFunc() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	// GetOrSetFunc retrieves and returns the value of `key`, or sets `key` with result of function `f`
	// and returns its result if `key` does not exist in the cache.
	c.GetOrSetFunc(ctx, 1, func() (interface{}, error) {
		return 111, nil
	}, 10000*time.Millisecond)
	v, _ := c.Get(ctx, 1)
	fmt.Println(v)

	c.GetOrSetFunc(ctx, 2, func() (interface{}, error) {
		return nil, nil
	}, 10000*time.Millisecond)
	v1, _ := c.Get(ctx, 2)
	fmt.Println(v1)

	// Output:
	// 111
	//
}

func ExampleCache_GetOrSetFuncLock() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	// Modify locking Note that the function `f` should be executed within writing mutex lock for concurrent safety purpose.
	c.GetOrSetFuncLock(ctx, 1, func() (interface{}, error) {
		return 11, nil
	}, 0)
	v, _ := c.Get(ctx, 1)
	fmt.Println(v)

	// Modification failed
	c.GetOrSetFuncLock(ctx, 1, func() (interface{}, error) {
		return 111, nil
	}, 0)
	v, _ = c.Get(ctx, 1)
	fmt.Println(v)

	c.Remove(ctx, g.Slice{1, 2, 3}...)

	// Modify locking
	c.GetOrSetFuncLock(ctx, 1, func() (interface{}, error) {
		return 111, nil
	}, 0)
	v, _ = c.Get(ctx, 1)
	fmt.Println(v)

	// Modification failed
	c.GetOrSetFuncLock(ctx, 1, func() (interface{}, error) {
		return 11, nil
	}, 0)
	v, _ = c.Get(ctx, 1)
	fmt.Println(v)

	// Output:
	// 11
	// 11
	// 111
	// 111
}

func ExampleCache_Keys() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	c.SetMap(ctx, g.MapAnyAny{"k1": "v1", "k2": "v2"}, 0)

	// Print the current list of key values
	keys1, _ := c.Keys(ctx)
	fmt.Println(keys1)

	// Output:
	// [k1 k2]

}

func ExampleCache_Remove() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	c.SetMap(ctx, g.MapAnyAny{"k1": "v1", "k2": "v2"}, 0)

	// Remove deletes one or more keys from cache, and returns its value.
	// If multiple keys are given, it returns the value of the last deleted item.
	c.Remove(ctx, "k1")

	data, _ := c.Data(ctx)
	fmt.Println(data)

	// Output:
	// map[k2:v2]
}

func ExampleCache_Removes() {

	// Create a cache object,
	// Of course, you can also easily use the gcache package method directly
	c := gcache.New()

	c.SetMap(ctx, g.MapAnyAny{"k1": "v1", "k2": "v2", "k3": "v3", "k4": "v4"}, 0)

	// Remove deletes one or more keys from cache, and returns its value.
	// If multiple keys are given, it returns the value of the last deleted item.
	c.Removes(ctx, g.Slice{"k1", "k2", "k3"})

	data, _ := c.Data(ctx)
	fmt.Println(data)

	// Output:
	// map[k4:v4]
}