cache

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 Go to latest Published: Aug 30, 2023 License: MIT Imports: 21 Imported by: 14

Documentation

Overview

Copyright (c) 2017 Uber Technologies, Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Package cache is a generated GoMock package.

Index

Constants

View Source 
const (

	// DomainCacheRefreshInterval domain cache refresh interval
	DomainCacheRefreshInterval = 10 * time.Second
	// DomainCacheRefreshFailureRetryInterval is the wait time
	// if refreshment encounters error
	DomainCacheRefreshFailureRetryInterval = 1 * time.Second
)

Variables

View Source 
var (
	// DummyCreateTime is the create time used by all entries in the cache.
	DummyCreateTime = time.Time{}
)
View Source 
var (
	// ErrCacheFull is returned if Put fails due to cache being filled with pinned elements
	ErrCacheFull = errors.New("Cache capacity is fully occupied with pinned elements")
)
View Source 
var SampleRateKey = "sample_retention_rate"

SampleRateKey is key to specify sample rate

View Source 
var SampleRetentionKey = "sample_retention_days"

SampleRetentionKey is key to specify sample retention

Functions

This section is empty.

Types

type Cache 

type Cache interface {
	// Get retrieves an element based on a key, returning nil if the element
	// does not exist
	Get(key interface{}) interface{}

	// Put adds an element to the cache, returning the previous element
	Put(key interface{}, value interface{}) interface{}

	// PutIfNotExist puts a value associated with a given key if it does not exist
	PutIfNotExist(key interface{}, value interface{}) (interface{}, error)

	// Delete deletes an element in the cache
	Delete(key interface{})

	// Release decrements the ref count of a pinned element. If the ref count
	// drops to 0, the element can be evicted from the cache.
	Release(key interface{})

	// Iterator returns the iterator of the cache
	Iterator() Iterator

	// Size returns the number of entries currently stored in the Cache
	Size() int
}

A Cache is a generalized interface to a cache. See cache.LRU for a specific implementation (bounded cache with LRU eviction)

func New 

func New(opts *Options) Cache

New creates a new cache with the given options

func NewSimple added in v0.12.0 

func NewSimple(opts *SimpleOptions) Cache

NewSimple creates a new simple cache with given options. Simple cache will never evict entries and it will never reorder the elements. Simple cache also does not have the concept of pinning that LRU cache has. Internally simple cache uses a RWMutex instead of the exclusive Mutex that LRU cache uses. The RWMutex makes simple cache readable by many threads without introducing lock contention.

type CallbackFn added in v0.3.14 

type CallbackFn func(updatedDomains []*DomainCacheEntry)

CallbackFn is function to be called when the domain cache entries are changed it is guaranteed that CallbackFn pair will be both called or non will be called

type DomainCache 

type DomainCache interface {
	common.Daemon
	RegisterDomainChangeCallback(shard int, initialNotificationVersion int64, prepareCallback PrepareCallbackFn, callback CallbackFn)
	UnregisterDomainChangeCallback(shard int)
	GetDomain(name string) (*DomainCacheEntry, error)
	GetDomainByID(id string) (*DomainCacheEntry, error)
	GetDomainID(name string) (string, error)
	GetDomainName(id string) (string, error)
	GetAllDomain() map[string]*DomainCacheEntry
	GetCacheSize() (sizeOfCacheByName int64, sizeOfCacheByID int64)
}

DomainCache is used the cache domain information and configuration to avoid making too many calls to cassandra. This cache is mainly used by frontend for resolving domain names to domain uuids which are used throughout the system. Each domain entry is kept in the cache for one hour but also has an expiry of 10 seconds. This results in updating the domain entry every 10 seconds but in the case of a cassandra failure we can still keep on serving requests using the stale entry from cache upto an hour

func NewDomainCache 

func NewDomainCache(
	domainManager persistence.DomainManager,
	metadata cluster.Metadata,
	metricsClient metrics.Client,
	logger log.Logger,
) DomainCache

NewDomainCache creates a new instance of cache for holding onto domain information to reduce the load on persistence

func NewNoOpDomainCache added in v0.25.0 

func NewNoOpDomainCache() DomainCache

type DomainCacheEntries added in v0.3.13 

type DomainCacheEntries []*DomainCacheEntry

DomainCacheEntries is DomainCacheEntry slice

func (DomainCacheEntries) Len added in v0.3.13 

func (t DomainCacheEntries) Len() int

Len return length

func (DomainCacheEntries) Less added in v0.3.13 

func (t DomainCacheEntries) Less(i, j int) bool

Less implements sort.Interface

func (DomainCacheEntries) Swap added in v0.3.13 

func (t DomainCacheEntries) Swap(i, j int)

Swap implements sort.Interface.

type DomainCacheEntry added in v0.3.12 

type DomainCacheEntry struct {
	// contains filtered or unexported fields
}

DomainCacheEntry contains the info and config for a domain

func CreateDomainCacheEntry added in v0.3.14 

func CreateDomainCacheEntry(
	domainName string,
) *DomainCacheEntry

CreateDomainCacheEntry create a cache entry with domainName

func GetActiveDomainByID added in v0.25.0 

func GetActiveDomainByID(cache DomainCache, currentCluster string, domainID string) (*DomainCacheEntry, error)

func NewDomainCacheEntryForTest added in v0.5.2 

func NewDomainCacheEntryForTest(
	info *persistence.DomainInfo,
	config *persistence.DomainConfig,
	isGlobalDomain bool,
	repConfig *persistence.DomainReplicationConfig,
	failoverVersion int64,
	failoverEndtime *int64,
) *DomainCacheEntry

NewDomainCacheEntryForTest returns an entry with test data

func NewGlobalDomainCacheEntryForTest added in v0.6.0 

func NewGlobalDomainCacheEntryForTest(
	info *persistence.DomainInfo,
	config *persistence.DomainConfig,
	repConfig *persistence.DomainReplicationConfig,
	failoverVersion int64,
) *DomainCacheEntry

NewGlobalDomainCacheEntryForTest returns an entry with test data

func NewLocalDomainCacheEntryForTest added in v0.6.0 

func NewLocalDomainCacheEntryForTest(
	info *persistence.DomainInfo,
	config *persistence.DomainConfig,
	targetCluster string,
) *DomainCacheEntry

NewLocalDomainCacheEntryForTest returns an entry with test data

func (*DomainCacheEntry) GetConfig added in v0.3.12 

func (entry *DomainCacheEntry) GetConfig() *persistence.DomainConfig

GetConfig return the domain config

func (*DomainCacheEntry) GetConfigVersion added in v0.3.12 

func (entry *DomainCacheEntry) GetConfigVersion() int64

GetConfigVersion return the domain config version

func (*DomainCacheEntry) GetFailoverEndTime added in v0.14.0 

func (entry *DomainCacheEntry) GetFailoverEndTime() *int64

GetFailoverEndTime return the failover end time

func (*DomainCacheEntry) GetFailoverNotificationVersion added in v0.3.13 

func (entry *DomainCacheEntry) GetFailoverNotificationVersion() int64

GetFailoverNotificationVersion return the global notification version of when failover happened

func (*DomainCacheEntry) GetFailoverVersion added in v0.3.12 

func (entry *DomainCacheEntry) GetFailoverVersion() int64

GetFailoverVersion return the domain failover version

func (*DomainCacheEntry) GetInfo added in v0.3.12 

func (entry *DomainCacheEntry) GetInfo() *persistence.DomainInfo

GetInfo return the domain info

func (*DomainCacheEntry) GetNotificationVersion added in v0.3.13 

func (entry *DomainCacheEntry) GetNotificationVersion() int64

GetNotificationVersion return the global notification version of when domain changed

func (*DomainCacheEntry) GetPreviousFailoverVersion added in v0.14.0 

func (entry *DomainCacheEntry) GetPreviousFailoverVersion() int64

GetPreviousFailoverVersion return the last domain failover version

func (*DomainCacheEntry) GetReplicationConfig added in v0.3.12 

func (entry *DomainCacheEntry) GetReplicationConfig() *persistence.DomainReplicationConfig

GetReplicationConfig return the domain replication config

func (*DomainCacheEntry) GetReplicationPolicy added in v0.7.0 

func (entry *DomainCacheEntry) GetReplicationPolicy() ReplicationPolicy

GetReplicationPolicy return the derived workflow replication policy

func (*DomainCacheEntry) GetRetentionDays added in v0.4.0 

func (entry *DomainCacheEntry) GetRetentionDays(
	workflowID string,
) int32

GetRetentionDays returns retention in days for given workflow

func (*DomainCacheEntry) HasReplicationCluster added in v0.24.0 

func (entry *DomainCacheEntry) HasReplicationCluster(clusterName string) bool

HasReplicationCluster returns true if the domain has replication in the cluster

func (*DomainCacheEntry) IsActiveIn added in v0.25.0 

func (entry *DomainCacheEntry) IsActiveIn(currentCluster string) (bool, error)

IsActive return whether the domain is active, i.e. non global domain or global domain which active cluster is the current cluster If domain is not active, it also returns an error

func (*DomainCacheEntry) IsDomainPendingActive added in v0.13.0 

func (entry *DomainCacheEntry) IsDomainPendingActive() bool

IsDomainPendingActive returns whether the domain is in pending active state

func (*DomainCacheEntry) IsGlobalDomain added in v0.3.12 

func (entry *DomainCacheEntry) IsGlobalDomain() bool

IsGlobalDomain return whether the domain is a global domain

func (*DomainCacheEntry) IsSampledForLongerRetention added in v0.4.0 

func (entry *DomainCacheEntry) IsSampledForLongerRetention(
	workflowID string,
) bool

IsSampledForLongerRetention return should given workflow been sampled or not

func (*DomainCacheEntry) IsSampledForLongerRetentionEnabled added in v0.4.0 

func (entry *DomainCacheEntry) IsSampledForLongerRetentionEnabled(
	workflowID string,
) bool

IsSampledForLongerRetentionEnabled return whether sample for longer retention is enabled or not

type DomainMetricsScopeCache added in v0.14.0 

type DomainMetricsScopeCache interface {
	// Get retrieves metrics scope for a domainID and scopeIdx
	Get(domainID string, scopeIdx int) (metrics.Scope, bool)
	// Put adds metrics scope for a domainID and scopeIdx
	Put(domainID string, scopeIdx int, metricsScope metrics.Scope)

	common.Daemon
}

DomainMetricsScopeCache represents a interface for mapping domainID and scopeIdx to metricsScope

func NewDomainMetricsScopeCache added in v0.14.0 

func NewDomainMetricsScopeCache() DomainMetricsScopeCache

NewDomainMetricsScopeCache constructs a new domainMetricsScopeCache

type Entry added in v0.3.5 

type Entry interface {
	// Key represents the key
	Key() interface{}
	// Value represents the value
	Value() interface{}
	// CreateTime represents the time when the entry is created
	CreateTime() time.Time
}

Entry represents a key-value entry within the map

type GetCacheItemSizeFunc added in v0.14.0 

type GetCacheItemSizeFunc func(interface{}) uint64

GetCacheItemSizeFunc returns the cache item size in bytes

type Iterator added in v0.3.5 

type Iterator interface {
	// Close closes the iterator
	// and releases any allocated resources
	Close()
	// HasNext return true if there is more items to be returned
	HasNext() bool
	// Next return the next item
	Next() Entry
}

Iterator represents the interface for cache iterators

type MockDomainCache added in v0.11.0 

type MockDomainCache struct {
	// contains filtered or unexported fields
}

MockDomainCache is a mock of DomainCache interface.

func NewMockDomainCache added in v0.11.0 

func NewMockDomainCache(ctrl *gomock.Controller) *MockDomainCache

NewMockDomainCache creates a new mock instance.

func (*MockDomainCache) EXPECT added in v0.11.0 

func (m *MockDomainCache) EXPECT() *MockDomainCacheMockRecorder

EXPECT returns an object that allows the caller to indicate expected use.

func (*MockDomainCache) GetAllDomain added in v0.11.0 

func (m *MockDomainCache) GetAllDomain() map[string]*DomainCacheEntry

GetAllDomain mocks base method.

func (*MockDomainCache) GetCacheSize added in v0.11.0 

func (m *MockDomainCache) GetCacheSize() (int64, int64)

GetCacheSize mocks base method.

func (*MockDomainCache) GetDomain added in v0.11.0 

func (m *MockDomainCache) GetDomain(name string) (*DomainCacheEntry, error)

GetDomain mocks base method.

func (*MockDomainCache) GetDomainByID added in v0.11.0 

func (m *MockDomainCache) GetDomainByID(id string) (*DomainCacheEntry, error)

GetDomainByID mocks base method.

func (*MockDomainCache) GetDomainID added in v0.11.0 

func (m *MockDomainCache) GetDomainID(name string) (string, error)

GetDomainID mocks base method.

func (*MockDomainCache) GetDomainName added in v0.11.0 

func (m *MockDomainCache) GetDomainName(id string) (string, error)

GetDomainName mocks base method.

func (*MockDomainCache) RegisterDomainChangeCallback added in v0.11.0 

func (m *MockDomainCache) RegisterDomainChangeCallback(shard int, initialNotificationVersion int64, prepareCallback PrepareCallbackFn, callback CallbackFn)

RegisterDomainChangeCallback mocks base method.

func (*MockDomainCache) Start added in v0.11.0 

func (m *MockDomainCache) Start()

Start mocks base method.

func (*MockDomainCache) Stop added in v0.11.0 

func (m *MockDomainCache) Stop()

Stop mocks base method.

func (*MockDomainCache) UnregisterDomainChangeCallback added in v0.11.0 

func (m *MockDomainCache) UnregisterDomainChangeCallback(shard int)

UnregisterDomainChangeCallback mocks base method.

type MockDomainCacheMockRecorder added in v0.11.0 

type MockDomainCacheMockRecorder struct {
	// contains filtered or unexported fields
}

MockDomainCacheMockRecorder is the mock recorder for MockDomainCache.

func (*MockDomainCacheMockRecorder) GetAllDomain added in v0.11.0 

func (mr *MockDomainCacheMockRecorder) GetAllDomain() *gomock.Call

GetAllDomain indicates an expected call of GetAllDomain.

func (*MockDomainCacheMockRecorder) GetCacheSize added in v0.11.0 

func (mr *MockDomainCacheMockRecorder) GetCacheSize() *gomock.Call

GetCacheSize indicates an expected call of GetCacheSize.

func (*MockDomainCacheMockRecorder) GetDomain added in v0.11.0 

func (mr *MockDomainCacheMockRecorder) GetDomain(name interface{}) *gomock.Call

GetDomain indicates an expected call of GetDomain.

func (*MockDomainCacheMockRecorder) GetDomainByID added in v0.11.0 

func (mr *MockDomainCacheMockRecorder) GetDomainByID(id interface{}) *gomock.Call

GetDomainByID indicates an expected call of GetDomainByID.

func (*MockDomainCacheMockRecorder) GetDomainID added in v0.11.0 

func (mr *MockDomainCacheMockRecorder) GetDomainID(name interface{}) *gomock.Call

GetDomainID indicates an expected call of GetDomainID.

func (*MockDomainCacheMockRecorder) GetDomainName added in v0.11.0 

func (mr *MockDomainCacheMockRecorder) GetDomainName(id interface{}) *gomock.Call

GetDomainName indicates an expected call of GetDomainName.

func (*MockDomainCacheMockRecorder) RegisterDomainChangeCallback added in v0.11.0 

func (mr *MockDomainCacheMockRecorder) RegisterDomainChangeCallback(shard, initialNotificationVersion, prepareCallback, callback interface{}) *gomock.Call

RegisterDomainChangeCallback indicates an expected call of RegisterDomainChangeCallback.

func (*MockDomainCacheMockRecorder) Start added in v0.11.0 

func (mr *MockDomainCacheMockRecorder) Start() *gomock.Call

Start indicates an expected call of Start.

func (*MockDomainCacheMockRecorder) Stop added in v0.11.0 

func (mr *MockDomainCacheMockRecorder) Stop() *gomock.Call

Stop indicates an expected call of Stop.

func (*MockDomainCacheMockRecorder) UnregisterDomainChangeCallback added in v0.11.0 

func (mr *MockDomainCacheMockRecorder) UnregisterDomainChangeCallback(shard interface{}) *gomock.Call

UnregisterDomainChangeCallback indicates an expected call of UnregisterDomainChangeCallback.

type Options 

type Options struct {
	// TTL controls the time-to-live for a given cache entry.  Cache entries that
	// are older than the TTL will not be returned.
	TTL time.Duration

	// InitialCapacity controls the initial capacity of the cache
	InitialCapacity int

	// Pin prevents in-use objects from getting evicted.
	Pin bool

	// RemovedFunc is an optional function called when an element
	// is scheduled for deletion
	RemovedFunc RemovedFunc

	// MaxCount controls the max capacity of the cache
	// It is required option if MaxSize is not provided
	MaxCount int

	// GetCacheItemSizeFunc is a function called upon adding the item to update the cache size.
	// It returns 0 by default, assuming the cache is just count based
	// It is required option if MaxCount is not provided
	GetCacheItemSizeFunc GetCacheItemSizeFunc

	// MaxSize is an optional and must be set along with GetCacheItemSizeFunc
	// to control the max size in bytes of the cache
	// It is required option if MaxCount is not provided
	MaxSize uint64
}

Options control the behavior of the cache

type PrepareCallbackFn added in v0.5.0 

type PrepareCallbackFn func()

PrepareCallbackFn is function to be called before CallbackFn is called, it is guaranteed that PrepareCallbackFn and CallbackFn pair will be both called or non will be called

type RemovedFunc 

type RemovedFunc func(interface{})

RemovedFunc is a type for notifying applications when an item is scheduled for removal from the Cache. If f is a function with the appropriate signature and i is the interface{} scheduled for deletion, Cache calls go f(i)

type ReplicationPolicy added in v0.7.0 

type ReplicationPolicy int

ReplicationPolicy is the domain's replication policy, derived from domain's replication config 

const (
	// ReplicationPolicyOneCluster indicate that workflows does not need to be replicated
	// applicable to local domain & global domain with one cluster
	ReplicationPolicyOneCluster ReplicationPolicy = 0
	// ReplicationPolicyMultiCluster indicate that workflows need to be replicated
	ReplicationPolicyMultiCluster ReplicationPolicy = 1
)

type SimpleOptions added in v0.12.0 

type SimpleOptions struct {
	// InitialCapacity controls the initial capacity of the cache
	InitialCapacity int

	// RemovedFunc is an optional function called when an element
	// is scheduled for deletion
	RemovedFunc RemovedFunc
}

SimpleOptions provides options that can be used to configure SimpleCache

Source Files

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