Class Dependency

Namespace

Cuemon.Runtime

Assembly

Cuemon.Core.dll

Represents the base class from which all implementations of dependency relationship to an object should derive.

public abstract class Dependency : IDependency

Inheritance

Object

Dependency

Implements

IDependency

Derived

DatabaseDependency

HttpDependency

FileDependency

Remarks

The implementing class of the Dependency class must monitor the dependency relationships so that when any of them changes, action will automatically be taken.

Constructors

Dependency(Func<EventHandler<WatcherEventArgs>, IEnumerable<IWatcher>>, Boolean)

Initializes a new instance of the Dependency class.

protected Dependency(Func<EventHandler<WatcherEventArgs>, IEnumerable<IWatcher>> watchersHandler, bool breakTieOnChanged)

Parameters

watchersHandler Func<EventHandler<WatcherEventArgs>, IEnumerable<IWatcher>>

The function delegate that associates watchers to this dependency.

breakTieOnChanged Boolean

if set to true all IWatcher instances is disassociated with this dependency after first notification of changed.

Properties

BreakTieOnChanged

Gets a value indicating whether all IWatcher instances is disassociated with this dependency after first notification of changed.

public bool BreakTieOnChanged { get; }

Property Value

Boolean

true if all IWatcher instances is disassociated with this dependency after first notification of changed; otherwise, false.

HasChanged

Gets a value indicating whether the Dependency object has changed.

public virtual bool HasChanged { get; }

Property Value

Boolean

true if the Dependency object has changed; otherwise, false.

UtcLastModified

Gets time when the dependency was last changed.

public DateTime? UtcLastModified { get; }

Property Value

Nullable<DateTime>

The time when the dependency was last changed.

Remarks

This property is measured in Coordinated Universal Time (UTC) (also known as Greenwich Mean Time).

Methods

OnDependencyChangedRaised(DependencyEventArgs)

Raises the DependencyChanged event.

protected virtual void OnDependencyChangedRaised(DependencyEventArgs e)

Parameters

e DependencyEventArgs

The DependencyEventArgs instance containing the event data.

OnWatcherChanged(Object, WatcherEventArgs)

Called when this object receives a signal from one or more of the associated IWatcher.

protected virtual void OnWatcherChanged(object sender, WatcherEventArgs args)

Parameters

sender Object

The source of the event.

args WatcherEventArgs

The WatcherEventArgs instance containing the event data.

SetUtcLastModified(DateTime)

Marks the time when a dependency last changed.

protected void SetUtcLastModified(DateTime utcLastModified)

Parameters

utcLastModified DateTime

The time when the dependency last changed.

Start()

Starts and performs the necessary dependency tasks of this instance.

public virtual void Start()

StartAsync()

Starts and performs the necessary dependency tasks of this instance.

public virtual Task StartAsync()

Returns

Task

The task object representing the asynchronous operation.

Events

DependencyChanged

Occurs when a Dependency has changed.

public event EventHandler<DependencyEventArgs> DependencyChanged

Event Type

EventHandler<DependencyEventArgs>