Class HostSet

Represents a set of hosts that perform some common work. Primarily used for sharding work among hosts in the set. The data is fed from the Metabase, and supports static and dynamic sets. Static sets have a metabase-fixed number of hosts, whereas dynamic sets may include dynamic hosts (as allocated by IaaS provider). The dynamic sets are not supported until IaaS providers are implemented

Inheritance
System.Object
DisposableObject
ApplicationComponent
HostSet
Implements
System.IDisposable
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
Namespace: Azos.Sky.Coordination
Assembly: Azos.Sky.dll
Syntax
public class HostSet : ApplicationComponent, IDisposable, IApplicationComponent, INamed

Constructors

HostSet(IApplication, String, String, String, IConfigSectionNode)

Declaration
protected HostSet(IApplication app, string setName, string reqPath, string path, IConfigSectionNode config)
Parameters
Type Name Description
IApplication app
System.String setName
System.String reqPath
System.String path
IConfigSectionNode config

Fields

CONFIG_HEARTBEAT_INTERVAL_SEC

Declaration
public const string CONFIG_HEARTBEAT_INTERVAL_SEC = "heartbeat-interval-sec"
Field Value
Type Description
System.String

DEFAULT_HEARTBEAT_INTERVAL_SEC

Declaration
public const int DEFAULT_HEARTBEAT_INTERVAL_SEC = 180
Field Value
Type Description
System.Int32

DEFAULT_LOG_LEVEL

Declaration
public const MessageType DEFAULT_LOG_LEVEL = MessageType.Warning
Field Value
Type Description
MessageType

MIN_HEARTBEAT_INTERVAL_SEC

Declaration
public const int MIN_HEARTBEAT_INTERVAL_SEC = 30
Field Value
Type Description
System.Int32

Properties

ComponentLogTopic

Declaration
public override string ComponentLogTopic { get; }
Property Value
Type Description
System.String
Overrides

DeclaredHosts

The hosts that are declared in set

Declaration
public IOrderedRegistry<HostSet.Host> DeclaredHosts { get; }
Property Value
Type Description
IOrderedRegistry<HostSet.Host>

Dynamic

True to indicate that the number of hosts in the set is flexible

Declaration
public bool Dynamic { get; }
Property Value
Type Description
System.Boolean

Name

Returns HostSet Name

Declaration
public string Name { get; }
Property Value
Type Description
System.String

Path

Returns the actual resolved region path at which the set operates

Declaration
public string Path { get; }
Property Value
Type Description
System.String

RequestedPath

Returns the region path that was requested

Declaration
public string RequestedPath { get; }
Property Value
Type Description
System.String

Methods

AssignHost(Object)

Assigns a worker from the set for the supplied sharding key. If key is null then a random member is assigned. Returns null if there is no host available for assignment

Declaration
public virtual HostSet.HostPair AssignHost(object shardingKey)
Parameters
Type Name Description
System.Object shardingKey
Returns
Type Description
HostSet.HostPair

BuildHostList()

Override to determine the lists of hosts in the set. In case of dynamic hosts this method may be called many times

Declaration
protected virtual void BuildHostList()

Destructor()

Declaration
protected override void Destructor()
Overrides

DoHeartbeat()

Declaration
protected virtual void DoHeartbeat()

Refresh()

Refreshes the list of hosts in the set

Declaration
public void Refresh()

Implements

System.IDisposable

Extension Methods