/// <summary>Initializes the pools.</summary>
public HttpConnectionPoolManager(HttpConnectionSettings settings)
{
_settings = settings;
_maxConnectionsPerServer = settings._maxConnectionsPerServer;
_avoidStoringConnections =
settings._pooledConnectionIdleTimeout == TimeSpan.Zero ||
settings._pooledConnectionLifetime == TimeSpan.Zero;
_pools = new ConcurrentDictionary <HttpConnectionKey, HttpConnectionPool>();
// Start out with the timer not running, since we have no pools.
// When it does run, run it with a frequency based on the idle timeout.
if (!_avoidStoringConnections)
{
if (settings._pooledConnectionIdleTimeout == Timeout.InfiniteTimeSpan)
{
const int DefaultScavengeSeconds = 30;
_cleanPoolTimeout = TimeSpan.FromSeconds(DefaultScavengeSeconds);
}
else
{
const int ScavengesPerIdle = 4;
const int MinScavengeSeconds = 1;
TimeSpan timerPeriod = settings._pooledConnectionIdleTimeout / ScavengesPerIdle;
_cleanPoolTimeout = timerPeriod.TotalSeconds >= MinScavengeSeconds ? timerPeriod : TimeSpan.FromSeconds(MinScavengeSeconds);
}
bool restoreFlow = false;
try
{
// Don't capture the current ExecutionContext and its AsyncLocals onto the timer causing them to live forever
if (!ExecutionContext.IsFlowSuppressed())
{
ExecutionContext.SuppressFlow();
restoreFlow = true;
}
_cleaningTimer = new Timer(s => ((HttpConnectionPoolManager)s).RemoveStalePools(), this, Timeout.Infinite, Timeout.Infinite);
}
finally
{
// Restore the current ExecutionContext
if (restoreFlow)
{
ExecutionContext.RestoreFlow();
}
}
}
// Figure out proxy stuff.
if (settings._useProxy)
{
_proxy = settings._proxy ?? SystemProxyInfo.ConstructSystemProxy();
if (_proxy != null)
{
_proxyCredentials = _proxy.Credentials ?? settings._defaultProxyCredentials;
}
}
}
/// <summary>Initializes the pools.</summary>
public HttpConnectionPoolManager(HttpConnectionSettings settings)
{
_settings = settings;
_maxConnectionsPerServer = settings._maxConnectionsPerServer;
_pools = new ConcurrentDictionary <HttpConnectionKey, HttpConnectionPool>();
// As an optimization, we can sometimes avoid the overheads associated with
// storing connections. This is possible when we would immediately terminate
// connections anyway due to either the idle timeout or the lifetime being
// set to zero, as in that case the timeout effectively immediately expires.
// However, we can only do such optimizations if we're not also tracking
// connections per server, as we use data in the associated data structures
// to do that tracking.
bool avoidStoringConnections =
settings._maxConnectionsPerServer == int.MaxValue &&
(settings._pooledConnectionIdleTimeout == TimeSpan.Zero ||
settings._pooledConnectionLifetime == TimeSpan.Zero);
// Start out with the timer not running, since we have no pools.
// When it does run, run it with a frequency based on the idle timeout.
if (!avoidStoringConnections)
{
if (settings._pooledConnectionIdleTimeout == Timeout.InfiniteTimeSpan)
{
const int DefaultScavengeSeconds = 30;
_cleanPoolTimeout = TimeSpan.FromSeconds(DefaultScavengeSeconds);
}
else
{
const int ScavengesPerIdle = 4;
const int MinScavengeSeconds = 1;
TimeSpan timerPeriod = settings._pooledConnectionIdleTimeout / ScavengesPerIdle;
_cleanPoolTimeout = timerPeriod.TotalSeconds >= MinScavengeSeconds ? timerPeriod : TimeSpan.FromSeconds(MinScavengeSeconds);
}
bool restoreFlow = false;
try
{
// Don't capture the current ExecutionContext and its AsyncLocals onto the timer causing them to live forever
if (!ExecutionContext.IsFlowSuppressed())
{
ExecutionContext.SuppressFlow();
restoreFlow = true;
}
// Create the timer. Ensure the Timer has a weak reference to this manager; otherwise, it
// can introduce a cycle that keeps the HttpConnectionPoolManager rooted by the Timer
// implementation until the handler is Disposed (or indefinitely if it's not).
_cleaningTimer = new Timer(s =>
{
var wr = (WeakReference <HttpConnectionPoolManager>)s;
if (wr.TryGetTarget(out HttpConnectionPoolManager thisRef))
{
thisRef.RemoveStalePools();
}
}, new WeakReference <HttpConnectionPoolManager>(this), Timeout.Infinite, Timeout.Infinite);
}
finally
{
// Restore the current ExecutionContext
if (restoreFlow)
{
ExecutionContext.RestoreFlow();
}
}
}
// Figure out proxy stuff.
if (settings._useProxy)
{
_proxy = settings._proxy ?? SystemProxyInfo.ConstructSystemProxy();
if (_proxy != null)
{
_proxyCredentials = _proxy.Credentials ?? settings._defaultProxyCredentials;
}
}
}
/// <summary>Initializes the pools.</summary>
public HttpConnectionPoolManager(HttpConnectionSettings settings)
{
_settings = settings;
_maxConnectionsPerServer = settings._maxConnectionsPerServer;
_avoidStoringConnections =
settings._pooledConnectionIdleTimeout == TimeSpan.Zero ||
settings._pooledConnectionLifetime == TimeSpan.Zero;
_pools = new ConcurrentDictionary <HttpConnectionKey, HttpConnectionPool>();
// Start out with the timer not running, since we have no pools.
// When it does run, run it with a frequency based on the idle timeout.
if (!_avoidStoringConnections)
{
if (settings._pooledConnectionIdleTimeout == Timeout.InfiniteTimeSpan)
{
const int DefaultScavengeSeconds = 30;
_cleanPoolTimeout = TimeSpan.FromSeconds(DefaultScavengeSeconds);
}
else
{
const int ScavengesPerIdle = 4;
const int MinScavengeSeconds = 1;
TimeSpan timerPeriod = settings._pooledConnectionIdleTimeout / ScavengesPerIdle;
_cleanPoolTimeout = timerPeriod.TotalSeconds >= MinScavengeSeconds ? timerPeriod : TimeSpan.FromSeconds(MinScavengeSeconds);
}
bool restoreFlow = false;
try
{
// Don't capture the current ExecutionContext and its AsyncLocals onto the timer causing them to live forever
if (!ExecutionContext.IsFlowSuppressed())
{
ExecutionContext.SuppressFlow();
restoreFlow = true;
}
// Create the timer. Ensure the Timer has a weak reference to this manager; otherwise, it
// can introduce a cycle that keeps the HttpConnectionPoolManager rooted by the Timer
// implementation until the handler is Disposed (or indefinitely if it's not).
_cleaningTimer = new Timer(s =>
{
var wr = (WeakReference <HttpConnectionPoolManager>)s;
if (wr.TryGetTarget(out HttpConnectionPoolManager thisRef))
{
thisRef.RemoveStalePools();
}
}, new WeakReference <HttpConnectionPoolManager>(this), Timeout.Infinite, Timeout.Infinite);
}
finally
{
// Restore the current ExecutionContext
if (restoreFlow)
{
ExecutionContext.RestoreFlow();
}
}
}
// Figure out proxy stuff.
if (settings._useProxy)
{
_proxy = settings._proxy ?? SystemProxyInfo.ConstructSystemProxy();
if (_proxy != null)
{
_proxyCredentials = _proxy.Credentials ?? settings._defaultProxyCredentials;
}
}
}
