com.microsoft.azure.servicebus.primitives

Class RetryPolicy

java.lang.Object

com.microsoft.azure.servicebus.primitives.RetryPolicy

Direct Known Subclasses:

RetryExponential

public abstract class RetryPolicy
extends Object

Represents an abstraction of a policy for retrying messaging operations when an exception is encountered. Some exceptions encountered by a sender or receiver can be transient like ServerBusy and the operation will succeed if retried. Clients can specify a retry policy using ConnectionStringBuilder which guides senders and receivers to automatically retry the failed operation before throwing the exception to the client application. Users should not implement this class, instead should use one of the provided implementations through getDefault() or getNoRetry().

Since:

1.0

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	RetryPolicy(String name) Creates an instance of RetryPolicy with the given name.

Method Summary

Modifier and Type	Method and Description
static RetryPolicy	getDefault() Retry policy that provides exponentially increasing retry intervals with each successive failure.
Duration	getNextRetryInterval(String clientId, Exception lastException, Duration remainingTime) Gets the interval after which nextRetry should be attempted, based on the last exception encountered and the remaining time before the operation times out.
static RetryPolicy	getNoRetry() Gets a retry policy that doesn't retry any operations, effectively disabling retries.
protected int	getRetryCount(String clientId)
void	incrementRetryCount(String clientId) Increments the number of successive retry attempts made by a client.
static boolean	isRetryableException(Exception exception) Determines if an exception is retry-able or not.
protected abstract Duration	onGetNextRetryInterval(String clientId, Exception lastException, Duration remainingTime, int baseWaitTime) Adjusts the interval after which nextRetry should be attempted, based on the last exception encountered, the remaining time before the operation times out and the minimum wait time before retry.
void	resetRetryCount(String clientId) Resets the number of retry attempts made by a client.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

RetryPolicy

protected RetryPolicy(String name)

Creates an instance of RetryPolicy with the given name.

Parameters:

name - name of the policy

Method Detail

incrementRetryCount

public void incrementRetryCount(String clientId)

Increments the number of successive retry attempts made by a client.

Parameters:

clientId - id of the client retrying a failed operation

resetRetryCount

public void resetRetryCount(String clientId)

Resets the number of retry attempts made by a client. This method is called by the client when retried operation succeeds.

Parameters:

clientId - id of the client that just retried a failed operation and succeeded.

isRetryableException

public static boolean isRetryableException(Exception exception)

Determines if an exception is retry-able or not. Only transient exceptions should be retried.

Parameters:

exception - exception encountered by an operation, to be determined if it is retry-able.

Returns:

true if the exception is retry-able (like ServerBusy or other transient exception), else returns false

getDefault

public static RetryPolicy getDefault()

Retry policy that provides exponentially increasing retry intervals with each successive failure. This policy is suitable for use by use most client applications and is also the default policy if no retry policy is specified.

Returns:

a retry policy that provides exponentially increasing retry intervals

getNoRetry

public static RetryPolicy getNoRetry()

Gets a retry policy that doesn't retry any operations, effectively disabling retries. Clients can use this retry policy in case they do not want any operation automatically retried.

Returns:

a retry policy that doesn't retry any operations

getRetryCount

protected int getRetryCount(String clientId)

getNextRetryInterval

public Duration getNextRetryInterval(String clientId,
                                     Exception lastException,
                                     Duration remainingTime)

Gets the interval after which nextRetry should be attempted, based on the last exception encountered and the remaining time before the operation times out.

Parameters:

clientId - id of the sender or receiver or client object that encountered the exception.

lastException - last exception encountered

remainingTime - remainingTime to retry before the operation times out

Returns:

duration after which the operation will be retried. Returns null when the operation should not retried.

onGetNextRetryInterval

protected abstract Duration onGetNextRetryInterval(String clientId,
                                                   Exception lastException,
                                                   Duration remainingTime,
                                                   int baseWaitTime)

Adjusts the interval after which nextRetry should be attempted, based on the last exception encountered, the remaining time before the operation times out and the minimum wait time before retry. Clients can override this method to specify a wait time based on the exception encountered.

Parameters:

clientId - id of the sender or receiver or client object that encountered the exception.

lastException - last exception encountered

remainingTime - remainingTime to retry before the operation times out

baseWaitTime - minimum wait time determined by the base retry policy. Overriding methods can return a different value.

Returns:

duration after which the operation will be retried. Returns null when the operation should not retried

toString

public String toString()

Overrides:

toString in class Object