Using Write-Behind with Basic Operations

Adding with Write-Behind

Member	Description
CacheItemVersion Add(string key, CacheItem item, DSWriteOption dsWriteOption, string providerName, DataSourceItemsAddedCallback onDataSourceItemAdded)	Adds item in cache using the specified provider and Write-Behind option

• Add without Callback Method

string key = "Customer:David:1001";
CacheItem cacheItem = new CacheItem(new Product());

try{
       cache.Add(key, cacheItem, DSWriteOption.WriteBehind, null);
}
catch (Exception exp){
    //Operation fails if the item already exists
    // Request is not sent to the backing source in
}

• Add with Callback Method

protected void OnDataSourceItemsAdded(IDictionary iDict)
{
    //Perform appropriate actions upon response
}

private void AddTest()
{
    string key = "Customer:David:1001";
    CacheItem cacheItem = new CacheItem(new Product());

    try{
        cache.Add(key, cacheItem, DSWriteOption.WriteBehind, OnDataSourceItemsAdded);
        //Verify item added in cache and in main source
    }
    catch (Exception exp){
        //Operation fails if the item already exists
    }
}

Updating Existing Data with Write-Behind

Member	Description
CacheItemVersion Insert(string key, CacheItem item, DSWriteOption dsWriteOption, string providerName, DataSourceItemsUpdatedCallback onDataSourceItemUpdatedCallback);	Adds item in cache using the default provider and Write-Behind option
CacheItemVersion Insert(string key, CacheItem item, DSWriteOption dsWriteOption, string providerName, DataSourceItemsUpdatedCallback onDataSourceItemUpdatedCallback);	Adds item in cache using the specified provider and Write-Behind option

        protected void OnDataSourceItemsUpdated(IDictionary iDict)
        {
            //Perform appropriate actions upon response
        }
        private void UpdateTest()
        {
            string key = "Customer:David:1001";
            cacheItem.SubGroup = "WriteThru-Test";

            try{
                            cache.Insert(key, cacheItem, DSWriteOption.WriteBehind, OnDataSourceItemsUpdated);
            }
            catch (Exception exp){
                //handle exception
            }
        }

Deleting Existing Data with Write-Behind

Member	Description
Delete(string key, DSWriteOption dsWriteOption, DataSourceItemsRemovedCallback onDataSourceItemRemovedCallback);	Deletes item in cache using the default provider and Write-Behind option
Delete(string key, DSWriteOption dsWriteOption, string providerName,DataSourceItemsRemovedCallback onDataSourceItemRemovedCallback);	Deletes item in cache using the specified provider and Write-Behind option

protected void OnDataSourceItemsRemoved(IDictionary iDict)
{
    //Perform appropriate actions upon response
}

private void DeleteTest()
{
    string key = "Customer:David:1001";
    try{
        cache.Delete(key, DSWriteOption.WriteBehind, OnDataSourceItemsRemoved);
        //Verify the removed item from both cache and data source
    }
    catch (OperationFailedException exp){
        //Operation fails if key does not exist in the cache
    }
}