MemcachedLock

Inherits: Lock, IConfigurable, IReferenceable, IOpenable

Description

The MemcachedLock class allows you to create a lock that is implemented based on the Memcached’s caching service.

Important points

• The current implementation does not support authentication.

Configuration parameters

• connection(s):
  • discovery_key: (optional) key to retrieve the connection from IDiscovery
  • host: host name or IP address
  • port: port number
  • uri: resource URI or connection string with all parameters in it
• options:
  • max_size: maximum number of values stored in this cache (default: 1000)
  • max_key_size: maximum key length (default: 250)
  • max_expiration: maximum expiration duration in milliseconds (default: 2592000)
  • max_value: maximum value length (default: 1048576)
  • pool_size: pool size (default: 5)
  • reconnect: reconnection timeout in milliseconds (default: 10 sec)
  • retries: number of retries (default: 3)
  • timeout: default caching timeout in milliseconds (default: 1 minute)
  • failures: number of failures before stop retrying (default: 5)
  • retry: retry timeout in milliseconds (default: 30 sec)
  • idle: idle timeout (milliseconds) before disconnecting (default: 5 sec)

References

• *:discovery:*:*:1.0 - (optional) IDiscovery services to resolve connection

Instance methods

CloseAsync

Closes a component and frees used resources.

public Task CloseAsync(string correlationId)

• correlationId: string - (optional) transaction id used to trace execution through the call chain.

Configure

Configures a component by passing its configuration parameters.

public new void Configure(ConfigParams config)

• config: ConfigParams - configuration parameters to be set.

IsOpen

Checks if the component is open.

public bool IsOpen()

• returns: bool - true if the component is open and false otherwise.

OpenAsync

Opens the component.

public Task OpenAsync(string correlationId)

• correlationId: string - (optional) transaction id used to trace execution through the call chain.

ReleaseLock

Releases a prevously acquired lock by its key.

public override void ReleaseLock(string correlationId, string key)

• correlationId: string - (optional) transaction id used to trace execution through the call chain.
• key: string - unique lock key to release.

SetReferences

Sets references to dependent components.

public void SetReferences(IReferences references)

• references: IReferences - references to locate the component’s dependencies.

TryAcquireLock

Makes a single attempt to acquire a lock by its key. It returns a positive or negative result immediately.

public override bool TryAcquireLock(string correlationId, string key, long ttl)

• correlationId: string - (optional) transaction id used to trace execution through the call chain.
• key: string - unique lock key to acquire.
• ttl: long - lock timeout (time to live) in milliseconds.
• returns: bool - true if lock was successfull and false otherwise.

Examples

var lock = new MemcachedLock();
lock.Configure(ConfigParams.FromTuples(
  "host", "localhost",
  "port", 11211));
lock.Open("123");
lock.TryAcquireLock("123", "key1", 0);
lock.ReleaseLock("123", "key1");