/// <summary>
/// Writes the cache directive to the operation context.
/// </summary>
/// <param name="directive"></param>
/// <param name="operationContext"></param>
protected internal static void WriteCachingDirectiveHeaders(ResponseCachingDirective directive, OperationContext operationContext)
{
// add caching directive to WCF message headers so that we send it to the client
var header = MessageHeader.CreateHeader(HeaderName, HeaderNamespace, directive);
operationContext.OutgoingMessageHeaders.Add(header);
}
/// <summary> /// Implemented by the subclass to cache the response, based on the specified caching directive. /// </summary> /// <param name="invocation"></param> /// <param name="cacheClient"></param> /// <param name="cacheKey"></param> /// <param name="region"></param> /// <param name="directive"></param> protected abstract void CacheResponse(IInvocation invocation, ICacheClient cacheClient, string cacheKey, string region, ResponseCachingDirective directive);
/// <summary>
/// Puts the invocation response in the specified cache.
/// </summary>
/// <param name="invocation"></param>
/// <param name="cacheClient"></param>
/// <param name="cacheKey"></param>
/// <param name="region"></param>
/// <param name="directive"></param>
protected static void PutResponseInCache(IInvocation invocation, ICacheClient cacheClient, string cacheKey, string region, ResponseCachingDirective directive)
{
// bail if the directive does not tell us to cache anything
if (directive == null || !directive.EnableCaching || directive.TimeToLive == TimeSpan.Zero)
{
return;
}
// if we don't have a cache key, this is an error
if (cacheKey == null)
{
throw new InvalidOperationException(
string.Format("{0} is cacheable but the request class does not implement IDefinesCacheKey.", invocation.GetType().FullName));
}
// put response in cache
cacheClient.Put(cacheKey, invocation.ReturnValue, new CachePutOptions(region, directive.TimeToLive, false));
}
/// <summary>
/// Implemented by the subclass to cache the response, based on the specified caching directive.
/// </summary>
protected override void CacheResponse(IInvocation invocation, ICacheClient cacheClient, string cacheKey, string region, ResponseCachingDirective directive)
{
// put the response in the local cache
PutResponseInCache(invocation, cacheClient, cacheKey, region, directive);
}
