/// <summary>
/// Creates new HttpClient instance from specified factory
/// </summary>
public HttpClient Create(string name)
{
HttpClientPoolDescriptor descriptor = _descriptors[name];
//if pooling, search in pool
if (descriptor.PoolSize > 0)
{
for (int i = 0; i < descriptor.Items.Length; i++)
{
PoolItem item = descriptor.Items[i];
//we are creating instances by index order.
//if the code reaches to null item, it means all items are locked.
//create new instance and add into the pool
if (item == null)
{
item = new PoolItem();
item.Locked = true;
item.Expiration = DateTime.UtcNow + PoolItemExpiration;
descriptor.Items[i] = item;
item.Init(descriptor);
return(item.Instance);
}
//if we found an unlocked or lock expired item, re-use it.
if (!item.Locked || item.Expiration < DateTime.UtcNow)
{
//update lock
lock (item)
{
if (item.Locked)
{
continue;
}
item.Locked = true;
item.Expiration = DateTime.UtcNow + PoolItemExpiration;
}
//init if needed
item.Init(descriptor);
return(item.Instance);
}
}
}
//this code id executed when we are not using pool or pool is full.
//for both cases, we need to create an independent instance and return
HttpClient instance = new HttpClient();
descriptor.OptionsAction?.Invoke(instance);
return(instance);
}
/// <summary>
/// Adds new names configuration
/// </summary>
internal void AddConfiguration(string name, int poolSize, Action <HttpClient> configureAction)
{
HttpClientPoolDescriptor descriptor = new HttpClientPoolDescriptor
{
Name = name,
PoolSize = poolSize,
OptionsAction = configureAction,
Items = poolSize > 0 ? new PoolItem[poolSize] : null
};
_descriptors.Add(name, descriptor);
}
/// <summary>
/// Initialized the item when instance is being created for first time
/// </summary>
public void Init(HttpClientPoolDescriptor descriptor)
{
if (Instance != null)
{
return;
}
Instance = new HttpClient();
if (descriptor.OptionsAction != null)
{
descriptor.OptionsAction(Instance);
}
}
/// <summary>
/// Releases the HttpClient instance from specified factory
/// </summary>
public void Release(string name, HttpClient client)
{
HttpClientPoolDescriptor descriptor = _descriptors[name];
if (descriptor.PoolSize < 1 || descriptor.Items == null || descriptor.Items.Length < 1)
{
return;
}
foreach (var item in descriptor.Items)
{
if (item != null && item.Instance == client)
{
item.Locked = false;
return;
}
}
}
