/// <summary>
/// Given the connection string, opens up the corresponding data source and obtains the ShardMapManager.
/// </summary>
/// <param name="credentials">Credentials for performing ShardMapManager operations.</param>
/// <param name="storeConnectionFactory">Factory for store connections.</param>
/// <param name="storeOperationFactory">Factory for store operations.</param>
/// <param name="cacheStore">Cache store.</param>
/// <param name="loadPolicy">Initialization policy.</param>
/// <param name="retryPolicy">Policy for performing retries on connections to shard map manager database.</param>
/// <param name="retryBehavior">Policy for detecting transient errors.</param>
/// <param name="retryEventHandler">Event handler for store operation retry events.</param>
internal ShardMapManager(
SqlShardMapManagerCredentials credentials,
IStoreConnectionFactory storeConnectionFactory,
IStoreOperationFactory storeOperationFactory,
ICacheStore cacheStore,
ShardMapManagerLoadPolicy loadPolicy,
RetryPolicy retryPolicy,
RetryBehavior retryBehavior,
EventHandler <RetryingEventArgs> retryEventHandler)
{
Debug.Assert(credentials != null);
this.Credentials = credentials;
this.StoreConnectionFactory = storeConnectionFactory;
this.StoreOperationFactory = storeOperationFactory;
this.Cache = cacheStore;
this.RetryPolicy = new TransientFaultHandling.RetryPolicy(
new ShardManagementTransientErrorDetectionStrategy(retryBehavior),
retryPolicy.GetRetryStrategy());
// Register for TfhImpl.RetryPolicy.Retrying event.
this.RetryPolicy.Retrying += this.ShardMapManagerRetryingEventHandler;
// Add user specified event handler.
if (retryEventHandler != null)
{
this.ShardMapManagerRetrying += retryEventHandler;
}
if (loadPolicy == ShardMapManagerLoadPolicy.Eager)
{
// We eagerly load everything from ShardMapManager. In case of lazy
// loading policy, we will add things to local caches based on cache
// misses on lookups.
this.LoadFromStore();
}
}
/// <summary>
/// The retry policy to use when executing commands against sql databases
/// </summary>
/// <param name="retryPolicyPerShard">An instance of the <see cref="RetryPolicy"/> class</param>
/// <param name="retryBehavior">Behavior to use for detecting transient faults.</param>
/// <returns>An instance of the <see cref="RetryPolicy"/> class</returns>
internal static TransientFaultHandling.RetryPolicy GetSqlCommandRetryPolicy(RetryPolicy retryPolicyPerShard, RetryBehavior retryBehavior)
{
return new TransientFaultHandling.RetryPolicy(
new MultiShardQueryTransientErrorDetectionStrategy(retryBehavior),
retryPolicyPerShard.GetRetryStrategy());
}
/// <summary>
/// The retry policy to use when executing commands against sql databases
/// </summary>
/// <param name="retryPolicyPerShard">An instance of the <see cref="RetryPolicy"/> class</param>
/// <param name="retryBehavior">Behavior to use for detecting transient faults.</param>
/// <returns>An instance of the <see cref="RetryPolicy"/> class</returns>
internal static TransientFaultHandling.RetryPolicy GetSqlCommandRetryPolicy(RetryPolicy retryPolicyPerShard, RetryBehavior retryBehavior)
{
return(new TransientFaultHandling.RetryPolicy(
new MultiShardQueryTransientErrorDetectionStrategy(retryBehavior),
retryPolicyPerShard.GetRetryStrategy()));
}