public override bool OnStart()
{
try
{
// Register the dependency resolver for initializing handlers and service
// classes.
var resolver = CarWorkerHostDependencyResolver.CreateAsync().Result;
DependencyResolverFactory.Register(
resolver
);
// Set up the process defaults for connections to optimize storage performance
ServicePointManager.DefaultConnectionLimit = int.MaxValue;
var configuration = DispatcherConfiguration.GetCurrentConfiguration();
var typesToSearchForHandlers = typeof(UpdateLocationHandler)
.Assembly
.DefinedTypes;
_coordinator = ProcessingCoordinator.CreateAsync(
RoleEnvironment.CurrentRoleInstance.Id,
configuration.EventHubName,
configuration.ConsumerGroupName,
configuration.EventHubConnectionString,
configuration.CheckpointStorageAccount,
configuration.MaxBatchSize,
configuration.PrefetchCount,
configuration.ReceiveTimeout,
configuration.MaxConcurrencyPerProcessor,
typesToSearchForHandlers,
(name, partitionId) =>
new CircuitBreaker(
name,
partitionId,
configuration.CircuitBreakerWarningLevel,
configuration.CircuitBreakerTripLevel,
configuration.CircuitBreakerStallInterval,
configuration.CircuitBreakerLogCooldownInterval),
new DispatcherInstrumentationManager(instrumentationEnabled: true).CreatePublisher("WaWorkerHost")).Result;
bool result = base.OnStart();
return result;
}
catch (Exception ex)
{
// Hard error on startup, usually configuration or security related
// Ensure that we log this error, including a direct post to the local
// event log
LogHelpers.HandleRoleException(Logger, "OnStart()", ex);
Trace.TraceError(ex.ToString());
throw;
}
}
/// <summary>
///
/// </summary>
/// <param name="hostName">The name of the host, most like a worker role.</param>
/// <param name="eventHubName">The name of the event hub.</param>
/// <param name="consumerGroupName">The name of the consumer group.</param>
/// <param name="eventHubConnectionString">The connection string from the event hub.</param>
/// <param name="checkpointStorageAccount">The connection string for the storage account used when checkpointing for the event hub.</param>
/// <param name="maxBatchSize">The maximum size of the batch of events that the event processor will receive.</param>
/// <param name="prefetchCount">The number of events that the underlying event hub client will attempt to prefetch.</param>
/// <param name="receiveTimeout">The length of time the event processor host will wait before invoking ProcessEventsAsync when no events have been received.</param>
/// <param name="maxConcurrencyPerProcessor">The number of events a single event processor will process concurrently.</param>
/// <param name="typesToSearch">The collection of types to search for registered event handlers.</param>
/// <param name="circuitBreakerFactory">Factory function for creating a the circuit breaker.</param>
/// <param name="instrumentationPublisher">Used for custom performance counters.</param>
/// <returns></returns>
public async static Task<ProcessingCoordinator> CreateAsync(
string hostName,
string eventHubName,
string consumerGroupName,
string eventHubConnectionString,
string checkpointStorageAccount,
int maxBatchSize,
int prefetchCount,
TimeSpan receiveTimeout,
int maxConcurrencyPerProcessor,
IEnumerable<Type> typesToSearch,
Func<string, string, ICircuitBreaker> circuitBreakerFactory,
IDispatcherInstrumentationPublisher instrumentationPublisher)
{
var mp = new ProcessingCoordinator();
await mp.InitializeAsync(
hostName,
eventHubName, consumerGroupName, eventHubConnectionString,
checkpointStorageAccount, maxBatchSize, prefetchCount,
receiveTimeout, maxConcurrencyPerProcessor,
typesToSearch, circuitBreakerFactory, instrumentationPublisher);
return mp;
}
/// <summary>
///
/// </summary>
/// <param name="hostName">The name of the host, most like a worker role.</param>
/// <param name="eventHubName">The name of the event hub.</param>
/// <param name="consumerGroupName">The name of the consumer group.</param>
/// <param name="eventHubConnectionString">The connection string from the event hub.</param>
/// <param name="checkpointStorageAccount">The connection string for the storage account used when checkpointing for the event hub.</param>
/// <param name="maxBatchSize">The maximum size of the batch of events that the event processor will receive.</param>
/// <param name="prefetchCount">The number of events that the underlying event hub client will attempt to prefetch.</param>
/// <param name="receiveTimeout">The length of time the event processor host will wait before invoking ProcessEventsAsync when no events have been received.</param>
/// <param name="maxConcurrencyPerProcessor">The number of events a single event processor will process concurrently.</param>
/// <param name="typesToSearch">The collection of types to search for registered event handlers.</param>
/// <param name="circuitBreakerFactory">Factory function for creating a the circuit breaker.</param>
/// <param name="instrumentationPublisher">Used for custom performance counters.</param>
/// <returns></returns>
public async static Task <ProcessingCoordinator> CreateAsync(
string hostName,
string eventHubName,
string consumerGroupName,
string eventHubConnectionString,
string checkpointStorageAccount,
int maxBatchSize,
int prefetchCount,
TimeSpan receiveTimeout,
int maxConcurrencyPerProcessor,
IEnumerable <Type> typesToSearch,
Func <string, string, ICircuitBreaker> circuitBreakerFactory,
IDispatcherInstrumentationPublisher instrumentationPublisher)
{
var mp = new ProcessingCoordinator();
await mp.InitializeAsync(
hostName,
eventHubName, consumerGroupName, eventHubConnectionString,
checkpointStorageAccount, maxBatchSize, prefetchCount,
receiveTimeout, maxConcurrencyPerProcessor,
typesToSearch, circuitBreakerFactory, instrumentationPublisher);
return(mp);
}
