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resolversContainer.go
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/
resolversContainer.go
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package containers
import (
"fmt"
"sort"
"strings"
logger "github.com/ElrondNetwork/elrond-go-logger"
"github.com/ElrondNetwork/elrond-go/core/check"
"github.com/ElrondNetwork/elrond-go/core/container"
"github.com/ElrondNetwork/elrond-go/dataRetriever"
)
var _ dataRetriever.ResolversContainer = (*resolversContainer)(nil)
var log = logger.GetOrCreate("dataretriever/factory/containers")
// resolversContainer is a resolvers holder organized by type
type resolversContainer struct {
objects *container.MutexMap
}
// NewResolversContainer will create a new instance of a container
func NewResolversContainer() *resolversContainer {
return &resolversContainer{
objects: container.NewMutexMap(),
}
}
// Get returns the object stored at a certain key.
// Returns an error if the element does not exist
func (rc *resolversContainer) Get(key string) (dataRetriever.Resolver, error) {
value, ok := rc.objects.Get(key)
if !ok {
return nil, fmt.Errorf("%w in resolvers container for key %v", dataRetriever.ErrInvalidContainerKey, key)
}
resolver, ok := value.(dataRetriever.Resolver)
if !ok {
return nil, dataRetriever.ErrWrongTypeInContainer
}
return resolver, nil
}
// Add will add an object at a given key. Returns
// an error if the element already exists
func (rc *resolversContainer) Add(key string, resolver dataRetriever.Resolver) error {
if check.IfNil(resolver) {
return dataRetriever.ErrNilContainerElement
}
ok := rc.objects.Insert(key, resolver)
if !ok {
return dataRetriever.ErrContainerKeyAlreadyExists
}
return nil
}
// AddMultiple will add objects with given keys. Returns
// an error if one element already exists, lengths mismatch or an interceptor is nil
func (rc *resolversContainer) AddMultiple(keys []string, resolvers []dataRetriever.Resolver) error {
if len(keys) != len(resolvers) {
return dataRetriever.ErrLenMismatch
}
for idx, key := range keys {
err := rc.Add(key, resolvers[idx])
if err != nil {
return err
}
}
return nil
}
// Replace will add (or replace if it already exists) an object at a given key
func (rc *resolversContainer) Replace(key string, resolver dataRetriever.Resolver) error {
if check.IfNil(resolver) {
return dataRetriever.ErrNilContainerElement
}
rc.objects.Set(key, resolver)
return nil
}
// Remove will remove an object at a given key
func (rc *resolversContainer) Remove(key string) {
rc.objects.Remove(key)
}
// Len returns the length of the added objects
func (rc *resolversContainer) Len() int {
return rc.objects.Len()
}
// ResolverKeys will return the contained resolvers keys in a concatenated string
func (rc *resolversContainer) ResolverKeys() string {
keys := rc.objects.Keys()
stringKeys := make([]string, 0, len(keys))
for _, k := range keys {
key, ok := k.(string)
if !ok {
continue
}
stringKeys = append(stringKeys, key)
}
sort.Slice(stringKeys, func(i, j int) bool {
return strings.Compare(stringKeys[i], stringKeys[j]) < 0
})
return strings.Join(stringKeys, ", ")
}
// Iterate will call the provided handler for each and every key-value pair
func (rc *resolversContainer) Iterate(handler func(key string, resolver dataRetriever.Resolver) bool) {
if handler == nil {
return
}
for _, keyVal := range rc.objects.Keys() {
key, ok := keyVal.(string)
if !ok {
continue
}
val, ok := rc.objects.Get(key)
if !ok {
continue
}
resolver, ok := val.(dataRetriever.Resolver)
if !ok {
continue
}
shouldContinue := handler(key, resolver)
if !shouldContinue {
return
}
}
}
// Close will try to close each containing resolver if that resolver implements the Closer interface
func (rc *resolversContainer) Close() error {
var foundErr error
rc.Iterate(func(key string, resolver dataRetriever.Resolver) bool {
log.Debug("closing resolver", "key", key)
err := resolver.Close()
if err != nil {
log.Warn("error closing resolver", "key", key, "error", err.Error())
foundErr = err
return true
}
return true
})
return foundErr
}
// IsInterfaceNil returns true if there is no value under the interface
func (rc *resolversContainer) IsInterfaceNil() bool {
return rc == nil
}