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Class RetryPolicy

Provides the base implementation of the retry mechanism for unreliable actions and transient conditions.

Inheritance

System.Object

Namespace: Umbraco.Core.Persistence.FaultHandling

Assembly: Umbraco.Core.dll

Syntax

public class RetryPolicy

Constructors

RetryPolicy(ITransientErrorDetectionStrategy, Int32)

Initializes a new instance of the RetryPolicy class with the specified number of retry attempts and default fixed time interval between retries.

Declaration

public RetryPolicy(ITransientErrorDetectionStrategy errorDetectionStrategy, int retryCount)

Parameters

Type	Name	Description
ITransientErrorDetectionStrategy	errorDetectionStrategy	The ITransientErrorDetectionStrategy that is responsible for detecting transient conditions.
System.Int32	retryCount	The number of retry attempts.

RetryPolicy(ITransientErrorDetectionStrategy, Int32, TimeSpan)

Initializes a new instance of the RetryPolicy class with the specified number of retry attempts and fixed time interval between retries.

Declaration

public RetryPolicy(ITransientErrorDetectionStrategy errorDetectionStrategy, int retryCount, TimeSpan retryInterval)

Parameters

Type	Name	Description
ITransientErrorDetectionStrategy	errorDetectionStrategy	The ITransientErrorDetectionStrategy that is responsible for detecting transient conditions.
System.Int32	retryCount	The number of retry attempts.
System.TimeSpan	retryInterval	The interval between retries.

RetryPolicy(ITransientErrorDetectionStrategy, Int32, TimeSpan, TimeSpan)

Initializes a new instance of the RetryPolicy class with the specified number of retry attempts and parameters defining the progressive delay between retries.

Declaration

public RetryPolicy(ITransientErrorDetectionStrategy errorDetectionStrategy, int retryCount, TimeSpan initialInterval, TimeSpan increment)

Parameters

Type	Name	Description
ITransientErrorDetectionStrategy	errorDetectionStrategy	The ITransientErrorDetectionStrategy that is responsible for detecting transient conditions.
System.Int32	retryCount	The number of retry attempts.
System.TimeSpan	initialInterval	The initial interval that will apply for the first retry.
System.TimeSpan	increment	The incremental time value that will be used for calculating the progressive delay between retries.

RetryPolicy(ITransientErrorDetectionStrategy, Int32, TimeSpan, TimeSpan, TimeSpan)

Initializes a new instance of the RetryPolicy class with the specified number of retry attempts and back-off parameters for calculating the exponential delay between retries.

Declaration

public RetryPolicy(ITransientErrorDetectionStrategy errorDetectionStrategy, int retryCount, TimeSpan minBackoff, TimeSpan maxBackoff, TimeSpan deltaBackoff)

Parameters

Type	Name	Description
ITransientErrorDetectionStrategy	errorDetectionStrategy	The ITransientErrorDetectionStrategy that is responsible for detecting transient conditions.
System.Int32	retryCount	The number of retry attempts.
System.TimeSpan	minBackoff	The minimum back-off time.
System.TimeSpan	maxBackoff	The maximum back-off time.
System.TimeSpan	deltaBackoff	The time value that will be used for calculating a random delta in the exponential delay between retries.

RetryPolicy(ITransientErrorDetectionStrategy, RetryStrategy)

Initializes a new instance of the RetryPolicy class with the specified number of retry attempts and parameters defining the progressive delay between retries.

Declaration

public RetryPolicy(ITransientErrorDetectionStrategy errorDetectionStrategy, RetryStrategy retryStrategy)

Parameters

Type	Name	Description
ITransientErrorDetectionStrategy	errorDetectionStrategy	The ITransientErrorDetectionStrategy that is responsible for detecting transient conditions.
RetryStrategy	retryStrategy	The retry strategy to use for this retry policy.

Fields

DefaultExponential

Returns a default policy that implements a random exponential retry interval configured with the default FixedInterval retry strategy. The default retry policy treats all caught exceptions as transient errors.

Declaration

public static readonly RetryPolicy DefaultExponential

Field Value

Type	Description
RetryPolicy

DefaultFixed

Returns a default policy that implements a fixed retry interval configured with the default FixedInterval retry strategy. The default retry policy treats all caught exceptions as transient errors.

Declaration

public static readonly RetryPolicy DefaultFixed

Field Value

Type	Description
RetryPolicy

DefaultProgressive

Returns a default policy that implements a progressive retry interval configured with the default Incremental retry strategy. The default retry policy treats all caught exceptions as transient errors.

Declaration

public static readonly RetryPolicy DefaultProgressive

Field Value

Type	Description
RetryPolicy

NoRetry

Returns a default policy that does no retries, it just invokes action exactly once.

Declaration

public static readonly RetryPolicy NoRetry

Field Value

Type	Description
RetryPolicy

Properties

ErrorDetectionStrategy

Gets the instance of the error detection strategy.

Declaration

public ITransientErrorDetectionStrategy ErrorDetectionStrategy { get; }

Property Value

Type	Description
ITransientErrorDetectionStrategy

RetryStrategy

Gets the retry strategy.

Declaration

public RetryStrategy RetryStrategy { get; }

Property Value

Type	Description
RetryStrategy

Methods

ExecuteAction(Action)

Repetitively executes the specified action while it satisfies the current retry policy.

Declaration

public virtual void ExecuteAction(Action action)

Parameters

Type	Name	Description
System.Action	action	A delegate representing the executable action which doesn't return any results.

ExecuteAction<TResult>(Func<TResult>)

Repetitively executes the specified action while it satisfies the current retry policy.

Declaration

public virtual TResult ExecuteAction<TResult>(Func<TResult> func)

Parameters

Type	Name	Description
System.Func<TResult>	func	A delegate representing the executable action which returns the result of type R.

Returns

Type	Description
TResult	The result from the action.

Type Parameters

Name	Description
TResult	The type of result expected from the executable action.

OnRetrying(Int32, Exception, TimeSpan)

Notifies the subscribers whenever a retry condition is encountered.

Declaration

protected virtual void OnRetrying(int retryCount, Exception lastError, TimeSpan delay)

Parameters

Type	Name	Description
System.Int32	retryCount	The current retry attempt count.
System.Exception	lastError	The exception which caused the retry conditions to occur.
System.TimeSpan	delay	The delay indicating how long the current thread will be suspended for before the next iteration will be invoked.

Events

Retrying

An instance of a callback delegate that will be invoked whenever a retry condition is encountered.

Declaration

public event EventHandler<RetryingEventArgs> Retrying

Event Type

Type	Description
System.EventHandler<RetryingEventArgs>