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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.ServiceBus.Messaging;
using Microsoft.Practices.TransientFaultHandling;
namespace ProjectExtensions.Azure.ServiceBus {
/// <summary>
/// Allows you to configure the subscription
/// </summary>
[AttributeUsage(AttributeTargets.Class)]
public class MessageHandlerConfigurationAttribute : Attribute {
//http://msdn.microsoft.com/en-us/library/hh181895.aspx
int defaultMessageTimeToLive;
bool defaultMessageTimeToLiveSet;
int lockDuration;
bool lockDurationSet;
int maxConcurrentCalls;
int maxDeliveryCount;
bool maxDeliveryCountSet;
int prefetchCount;
bool prefetchCountSet;
/// <summary>
/// Create a new instance of the Attribute with the default settings.
/// </summary>
public MessageHandlerConfigurationAttribute() {
EnableBatchedOperations = true;
}
/// <summary>
/// Gets or sets the default message time to live for a subscription. (in seconds)
/// </summary>
public int DefaultMessageTimeToLive {
get {
return defaultMessageTimeToLive;
}
set {
defaultMessageTimeToLive = value;
defaultMessageTimeToLiveSet = true;
}
}
/// <summary>
/// Send the letter to the default dead letter queue after the max retries.
/// </summary>
public bool DeadLetterAfterMaxRetries {
get;
set;
}
/// <summary>
/// Gets or sets a value that indicates whether the batched operations are enabled.
/// </summary>
public bool EnableBatchedOperations {
get;
set;
}
/// <summary>
/// Gets or sets the value that indicates if a subscription has dead letter support when a message expires.
/// </summary>
public bool EnableDeadLetteringOnMessageExpiration {
get;
set;
}
/// <summary>
/// Gets or sets the lock duration time span for the subscription. (in seconds)
/// </summary>
/// <remarks>30 seconds to 5 minutes??? Looking for more info.</remarks>
public int LockDuration {
get {
return lockDuration;
}
set {
lockDuration = value;
lockDurationSet = true;
}
}
/// <summary>
/// Gets or sets the maximum number of concurrent calls to the callback the message pump should initiate.
/// </summary>
public int MaxConcurrentCalls {
get {
return maxConcurrentCalls;
}
set {
Guard.ArgumentNotZeroOrNegativeValue(value, "value");
maxConcurrentCalls = value;
}
}
/// <summary>
/// Gets or sets the number of maximum calls to your handler.
/// </summary>
public int MaxRetries {
get {
return maxDeliveryCount;
}
set {
Guard.ArgumentNotZeroOrNegativeValue(value, "value");
maxDeliveryCount = value;
maxDeliveryCountSet = true;
}
}
/// <summary>
/// If we threw an error, pause the provided milliseconds before calling the handler again
/// </summary>
/// <remarks>
/// The goal is to allow the application to have basic retry throttling logic.
/// </remarks>
public int PauseTimeIfErrorWasThrown {
get;
set;
}
//http://msdn.microsoft.com/en-us/library/hh144031.aspx
/// <summary>
/// Gets or sets the number of messages that the message receiver can simultaneously request.
/// </summary>
/// <remarks>This is a property of the SubscriptionClient</remarks>
public int PrefetchCount {
get {
return prefetchCount;
}
set {
Guard.ArgumentNotZeroOrNegativeValue(value, "value");
prefetchCount = value;
prefetchCountSet = true;
}
}
/// <summary>
/// Enumerates the values for the receive mode.
/// </summary>
/// <remarks>
/// PeekLock
/// Specifies the PeekLock receive mode.
/// This mode receives the message but keeps it peek-locked until the receiver abandons the message.
///
/// ReceiveAndDelete
/// Specifies the ReceiveAndDelete receive mode.
///This mode deletes the message after it is received.
/// </remarks>
public ReceiveMode ReceiveMode {
get;
set;
}
/// <summary>
/// Is the message handler a singleton or instance member?
/// </summary>
public bool Singleton {
get;
set;
}
internal bool DefaultMessageTimeToLiveSet() {
return defaultMessageTimeToLiveSet;
}
internal bool LockDurationSet() {
return lockDurationSet;
}
internal bool MaxDeliveryCountSet() {
return maxDeliveryCountSet;
}
internal bool PrefetchCountSet() {
return prefetchCountSet;
}
/// <summary>
/// Override of ToString();
/// </summary>
/// <returns>Data about the attribute normally used for debugging.</returns>
public override string ToString() {
var retVal = new StringBuilder();
retVal.Append("DefaultMessageTimeToLive: ").Append(this.DefaultMessageTimeToLive);
retVal.Append(" EnableBatchedOperations: ").Append(this.EnableBatchedOperations);
retVal.Append(" EnableDeadLetteringOnMessageExpiration: ").Append(this.EnableDeadLetteringOnMessageExpiration);
retVal.Append(" LockDuration: ").Append(this.LockDuration);
retVal.Append(" MaxConcurrentCalls: ").Append(this.MaxConcurrentCalls);
retVal.Append(" MaxDeliveryCount: ").Append(this.MaxRetries);
retVal.Append(" PrefetchCount: ").Append(this.PrefetchCount);
retVal.Append(" ReceiveMode: ").Append(this.ReceiveMode);
return retVal.ToString();
}
//todo look at RequiresSession and if we can support a session client in the future.
//todo look at TopicPath for the future as an override for the subscription.
//TODO determine if we need a flag to blow away the subscription since we can't set the values otherwise.
}
}