/// <summary>
/// This method processes a single SyncInterceptorAttribute defined on a method. Processing involves the following
/// 1. Ensure that the MethodInfo signature is the right one for the interceptor.
/// 2. Retrieve the ScopeNames defined in the attribute and ensure they are valid scopes configures via the
/// ISyncScopeConfiguration.SetEnableScope() API.
/// 3. Create a SyncInterceptorInfoWrapper object for the scope if none is present.
/// 4. Add the interceptor to the wrapper object.
/// </summary>
/// <param name="attr">The SyncInterceptorAttribute to process.</param>
/// <param name="syncServiceType">Actual SyncService type</param>
/// <param name="methodInfo">User Method on which the attribute is applied</param>
private void ProcessSyncInterceptor(SyncInterceptorAttribute attr, Type syncServiceType, MethodInfo methodInfo)
{
// Validate the method signature attribute
WebUtil.ValidateInterceptorSignature(attr, methodInfo, syncServiceType.Name);
// Read the list of scopeNames from the attribute
string[] scopeNames = attr.ScopeName.Select(e => e.ToLowerInvariant()).ToArray();
foreach (string scopeName in scopeNames)
{
// Check to ensure the scopeName is valid configured scope.
if (!this.ScopeNames.Contains(scopeName))
{
// ScopeName is not part of configured scopes. Throw.
throw new InvalidOperationException(
string.Format(CultureInfo.InvariantCulture, "ScopeName '{0}' defined in '{1}' on method '{2}' is not in the list of configured sync scopes.",
scopeName, attr.GetType().Name, methodInfo.Name));
}
SyncInterceptorsInfoWrapper wrapper = null;
// Check and create the wrapper object for the current scope if none exists.
if (!this.SyncInterceptors.TryGetValue(scopeName, out wrapper))
{
wrapper = new SyncInterceptorsInfoWrapper(scopeName);
this.SyncInterceptors.Add(scopeName, wrapper);
}
// Add interceptor to the wrapper.
wrapper.AddInterceptor(attr, methodInfo, syncServiceType.Name);
}
}
/// <summary>
/// Checks to see if a typed SyncResponseInterceptor for a specific operation has been configured by the user
/// </summary>
/// <returns>bool</returns>
internal bool HasTypedResponseInterceptor(string scopeName, SyncOperations operation, Type type)
{
SyncInterceptorsInfoWrapper wrapper = null;
if (this.SyncInterceptors.TryGetValue(scopeName.ToLowerInvariant(), out wrapper))
{
return(wrapper.HasResponseInterceptor(operation, type));
}
return(false);
}
/// <summary>
/// Checks to see if a typed SyncConflictInterceptor has been configured by the user
/// </summary>
/// <returns>bool</returns>
internal bool HasTypedConflictInterceptor(string scopeName, Type type)
{
SyncInterceptorsInfoWrapper wrapper = null;
if (this.SyncInterceptors.TryGetValue(scopeName.ToLowerInvariant(), out wrapper))
{
return(wrapper.HasConflictInterceptor(type));
}
return(false);
}
/// <summary>
/// Utility function that invokes the actual user interceptor extension method. If entityType is null
/// it looks for the generic interceptor. If its not null then it looks for a typed interceptor for the
/// specific type being passed.
/// </summary>
/// <param name="context">The context to pass as parameter to user code</param>
/// <param name="entityType">Type of the entity being processed</param>
/// <param name="isRequest">True if intercepting a request operation else false.</param>
internal void InvokeOperationInterceptors(SyncOperationContext context, Type entityType, bool isRequest)
{
SyncInterceptorsInfoWrapper wrapper = null;
if (this.SyncInterceptors.TryGetValue(context.ScopeName, out wrapper))
{
MethodInfo methodInfo = null;
switch (context.Operation)
{
case SyncOperations.Download:
if (entityType == null)
{
methodInfo = (isRequest) ? wrapper.DownloadRequestInterceptor : wrapper.DownloadResponseInterceptor;
}
else
{
Debug.Assert(!isRequest, "Cannot fire typed interceptor for DownloadRequest");
methodInfo = wrapper.GetResponseInterceptor(SyncOperations.Download, entityType);
}
break;
case SyncOperations.Upload:
if (entityType == null)
{
methodInfo = (isRequest) ? wrapper.UploadRequestInterceptor : wrapper.UploadResponseInterceptor;
}
else
{
methodInfo = (isRequest) ?
wrapper.GetRequestInterceptor(entityType) :
wrapper.GetResponseInterceptor(SyncOperations.Upload, entityType);
}
break;
}
if (methodInfo != null)
{
InvokeUserInterceptorMethod(methodInfo, OperationContext.Current.InstanceContext.GetServiceInstance(), new object[] { context });
}
}
}
/// <summary>
/// Utility for invoking user code for conflict interceptors
/// </summary>
/// <param name="context">The context to pass as parameter to user code</param>
/// <param name="mergedVersion">The merged version for Merge resolution</param>
/// <param name="entityType">Entity type of the conflict being raised</param>
/// <returns>Actual resolution picked by user</returns>
internal SyncConflictResolution?InvokeConflictInterceptor(SyncConflictContext context, Type entityType, out IOfflineEntity mergedVersion)
{
SyncInterceptorsInfoWrapper wrapper = null;
if (this.SyncInterceptors.TryGetValue(context.ScopeName, out wrapper))
{
// Look for unfiltered Conflict and if that is null then look for filtered one.
// Its an error to have both unfiltered and filtered ConflictInterceptor so both cannot be set.
MethodInfo methodInfo = wrapper.ConflictInterceptor ?? wrapper.GetConflictInterceptor(entityType);
if (methodInfo != null)
{
object[] inputParams = new object[] { context, null };
SyncConflictResolution resolution = (SyncConflictResolution)InvokeUserInterceptorMethod(methodInfo, OperationContext.Current.InstanceContext.GetServiceInstance(), inputParams);
// Merged version is in the second parameter which is passed by reference. Look it up
mergedVersion = (IOfflineEntity)inputParams[1];
return(resolution);
}
}
mergedVersion = null;
return(null);
}
/// <summary>
/// This method processes a single SyncInterceptorAttribute defined on a method. Processing involves the following
/// 1. Ensure that the MethodInfo signature is the right one for the interceptor.
/// 2. Retrieve the ScopeNames defined in the attribute and ensure they are valid scopes configures via the
/// ISyncScopeConfiguration.SetEnableScope() API.
/// 3. Create a SyncInterceptorInfoWrapper object for the scope if none is present.
/// 4. Add the interceptor to the wrapper object.
/// </summary>
/// <param name="attr">The SyncInterceptorAttribute to process.</param>
/// <param name="syncServiceType">Actual SyncService type</param>
/// <param name="methodInfo">User Method on which the attribute is applied</param>
private void ProcessSyncInterceptor(SyncInterceptorAttribute attr, Type syncServiceType, MethodInfo methodInfo)
{
// Validate the method signature attribute
WebUtil.ValidateInterceptorSignature(attr, methodInfo, syncServiceType.Name);
// Read the list of scopeNames from the attribute
string[] scopeNames = attr.ScopeName.Select(e => e.ToLowerInvariant()).ToArray();
foreach (string scopeName in scopeNames)
{
// Check to ensure the scopeName is valid configured scope.
if (!this.ScopeNames.Contains(scopeName))
{
// ScopeName is not part of configured scopes. Throw.
throw new InvalidOperationException(
string.Format(CultureInfo.InvariantCulture, "ScopeName '{0}' defined in '{1}' on method '{2}' is not in the list of configured sync scopes.",
scopeName, attr.GetType().Name, methodInfo.Name));
}
SyncInterceptorsInfoWrapper wrapper = null;
// Check and create the wrapper object for the current scope if none exists.
if (!this.SyncInterceptors.TryGetValue(scopeName, out wrapper))
{
wrapper = new SyncInterceptorsInfoWrapper(scopeName);
this.SyncInterceptors.Add(scopeName, wrapper);
}
// Add interceptor to the wrapper.
wrapper.AddInterceptor(attr, methodInfo, syncServiceType.Name);
}
}