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metadata.go
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metadata.go
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package lstoremem
import (
"fmt"
"sync"
core "github.com/dcnetio/gothreads-lib/core/logstore"
"github.com/dcnetio/gothreads-lib/core/thread"
)
type memoryThreadMetadata struct {
ds map[core.MetadataKey]interface{}
dslock sync.RWMutex
}
var _ core.ThreadMetadata = (*memoryThreadMetadata)(nil)
func NewThreadMetadata() core.ThreadMetadata {
return &memoryThreadMetadata{
ds: make(map[core.MetadataKey]interface{}),
}
}
func (m *memoryThreadMetadata) PutInt64(t thread.ID, key string, val int64) error {
m.putValue(t, key, val)
return nil
}
func (m *memoryThreadMetadata) GetInt64(t thread.ID, key string) (*int64, error) {
val, ok := m.getValue(t, key).(int64)
if !ok {
return nil, nil
}
return &val, nil
}
func (m *memoryThreadMetadata) PutString(t thread.ID, key string, val string) error {
m.putValue(t, key, val)
return nil
}
func (m *memoryThreadMetadata) GetString(t thread.ID, key string) (*string, error) {
val, ok := m.getValue(t, key).(string)
if !ok {
return nil, nil
}
return &val, nil
}
func (m *memoryThreadMetadata) PutBool(t thread.ID, key string, val bool) error {
m.putValue(t, key, val)
return nil
}
func (m *memoryThreadMetadata) GetBool(t thread.ID, key string) (*bool, error) {
val, ok := m.getValue(t, key).(bool)
if !ok {
return nil, nil
}
return &val, nil
}
func (m *memoryThreadMetadata) PutBytes(t thread.ID, key string, val []byte) error {
b := make([]byte, len(val))
copy(b, val)
m.putValue(t, key, b)
return nil
}
func (m *memoryThreadMetadata) GetBytes(t thread.ID, key string) (*[]byte, error) {
val, ok := m.getValue(t, key).([]byte)
if !ok {
return nil, nil
}
return &val, nil
}
func (m *memoryThreadMetadata) putValue(t thread.ID, key string, val interface{}) {
m.dslock.Lock()
defer m.dslock.Unlock()
m.ds[core.MetadataKey{T: t, K: key}] = val
}
func (m *memoryThreadMetadata) getValue(t thread.ID, key string) interface{} {
m.dslock.RLock()
defer m.dslock.RUnlock()
if v, ok := m.ds[core.MetadataKey{T: t, K: key}]; ok {
return v
}
return nil
}
func (m *memoryThreadMetadata) ClearMetadata(t thread.ID) error {
m.dslock.Lock()
defer m.dslock.Unlock()
for k := range m.ds {
if k.T.Equals(t) {
delete(m.ds, k)
}
}
return nil
}
func (m *memoryThreadMetadata) DumpMeta() (core.DumpMetadata, error) {
m.dslock.RLock()
defer m.dslock.RUnlock()
var (
dump core.DumpMetadata
vInt64 = make(map[core.MetadataKey]int64)
vBool = make(map[core.MetadataKey]bool)
vString = make(map[core.MetadataKey]string)
vBytes = make(map[core.MetadataKey][]byte)
)
for mk, value := range m.ds {
switch v := value.(type) {
case bool:
vBool[mk] = v
case int64:
vInt64[mk] = v
case string:
vString[mk] = v
case []byte:
vBytes[mk] = v
default:
return dump, fmt.Errorf("unsupported value type %T, key: %v, value: %v", value, mk, value)
}
}
dump.Data.Bool = vBool
dump.Data.Int64 = vInt64
dump.Data.String = vString
dump.Data.Bytes = vBytes
return dump, nil
}
func (m *memoryThreadMetadata) RestoreMeta(dump core.DumpMetadata) error {
var dataLen = len(dump.Data.Bool) +
len(dump.Data.Int64) +
len(dump.Data.String) +
len(dump.Data.Bytes)
if !AllowEmptyRestore && dataLen == 0 {
return core.ErrEmptyDump
}
m.dslock.Lock()
defer m.dslock.Unlock()
// clear local data
m.ds = make(map[core.MetadataKey]interface{}, dataLen)
// replace with dump
for mk, val := range dump.Data.Bool {
m.ds[mk] = val
}
for mk, val := range dump.Data.Int64 {
m.ds[mk] = val
}
for mk, val := range dump.Data.String {
m.ds[mk] = val
}
for mk, val := range dump.Data.Bytes {
m.ds[mk] = val
}
return nil
}