Package org.apache.http.impl.conn

Class PoolingHttpClientConnectionManager

java.lang.Object

org.apache.http.impl.conn.PoolingHttpClientConnectionManager

All Implemented Interfaces:

Closeable, AutoCloseable, HttpClientConnectionManager, ConnPoolControl<HttpRoute>

@Contract(threading=SAFE_CONDITIONAL)
public class PoolingHttpClientConnectionManager
extends Object
implements HttpClientConnectionManager, ConnPoolControl<HttpRoute>, Closeable

ClientConnectionPoolManager maintains a pool of HttpClientConnections and is able to service connection requests from multiple execution threads. Connections are pooled on a per route basis. A request for a route which already the manager has persistent connections for available in the pool will be services by leasing a connection from the pool rather than creating a brand new connection.

ClientConnectionPoolManager maintains a maximum limit of connection on a per route basis and in total. Per default this implementation will create no more than than 2 concurrent connections per given route and no more 20 connections in total. For many real-world applications these limits may prove too constraining, especially if they use HTTP as a transport protocol for their services. Connection limits, however, can be adjusted using ConnPoolControl methods.

Total time to live (TTL) set at construction time defines maximum life span of persistent connections regardless of their expiration setting. No persistent connection will be re-used past its TTL value.

The handling of stale connections was changed in version 4.4. Previously, the code would check every connection by default before re-using it. The code now only checks the connection if the elapsed time since the last use of the connection exceeds the timeout that has been set. The default timeout is set to 2000ms

Since:

4.3

Constructor Summary

Constructors

Constructor	Description
PoolingHttpClientConnectionManager()
PoolingHttpClientConnectionManager(long timeToLive, TimeUnit timeUnit)
PoolingHttpClientConnectionManager(Registry<ConnectionSocketFactory> socketFactoryRegistry)
PoolingHttpClientConnectionManager(Registry<ConnectionSocketFactory> socketFactoryRegistry, DnsResolver dnsResolver)
PoolingHttpClientConnectionManager(Registry<ConnectionSocketFactory> socketFactoryRegistry, HttpConnectionFactory<HttpRoute,ManagedHttpClientConnection> connFactory)
PoolingHttpClientConnectionManager(Registry<ConnectionSocketFactory> socketFactoryRegistry, HttpConnectionFactory<HttpRoute,ManagedHttpClientConnection> connFactory, DnsResolver dnsResolver)
PoolingHttpClientConnectionManager(Registry<ConnectionSocketFactory> socketFactoryRegistry, HttpConnectionFactory<HttpRoute,ManagedHttpClientConnection> connFactory, SchemePortResolver schemePortResolver, DnsResolver dnsResolver, long timeToLive, TimeUnit timeUnit)
PoolingHttpClientConnectionManager(HttpClientConnectionOperator httpClientConnectionOperator, HttpConnectionFactory<HttpRoute,ManagedHttpClientConnection> connFactory, long timeToLive, TimeUnit timeUnit)
PoolingHttpClientConnectionManager(HttpConnectionFactory<HttpRoute,ManagedHttpClientConnection> connFactory)

Method Summary

Modifier and Type	Method	Description
void	close()
void	closeExpiredConnections()	Closes all expired connections in the pool.
void	closeIdleConnections(long idleTimeout, TimeUnit timeUnit)	Closes idle connections in the pool.
void	connect(HttpClientConnection managedConn, HttpRoute route, int connectTimeout, HttpContext context)	Connects the underlying connection socket to the connection target in case of a direct route or to the first proxy hop in case of a route via a proxy (or multiple proxies).
ConnectionConfig	getConnectionConfig(HttpHost host)
ConnectionConfig	getDefaultConnectionConfig()
int	getDefaultMaxPerRoute()
SocketConfig	getDefaultSocketConfig()
int	getMaxPerRoute(HttpRoute route)
int	getMaxTotal()
Set<HttpRoute>	getRoutes()
SocketConfig	getSocketConfig(HttpHost host)
PoolStats	getStats(HttpRoute route)
PoolStats	getTotalStats()
int	getValidateAfterInactivity()
void	releaseConnection(HttpClientConnection managedConn, Object state, long keepalive, TimeUnit timeUnit)	Releases the connection back to the manager making it potentially re-usable by other consumers.
ConnectionRequest	requestConnection(HttpRoute route, Object state)	Returns a new ConnectionRequest, from which a HttpClientConnection can be obtained or the request can be aborted.
void	routeComplete(HttpClientConnection managedConn, HttpRoute route, HttpContext context)	Marks the connection as fully established with all its intermediate hops completed.
void	setConnectionConfig(HttpHost host, ConnectionConfig connectionConfig)
void	setDefaultConnectionConfig(ConnectionConfig defaultConnectionConfig)
void	setDefaultMaxPerRoute(int max)
void	setDefaultSocketConfig(SocketConfig defaultSocketConfig)
void	setMaxPerRoute(HttpRoute route, int max)
void	setMaxTotal(int max)
void	setSocketConfig(HttpHost host, SocketConfig socketConfig)
void	setValidateAfterInactivity(int ms)	Defines period of inactivity in milliseconds after which persistent connections must be re-validated prior to being leased to the consumer.
void	shutdown()	Shuts down this connection manager and releases allocated resources.
void	upgrade(HttpClientConnection managedConn, HttpRoute route, HttpContext context)	Upgrades the underlying connection socket to TLS/SSL (or another layering protocol) after having executed CONNECT method to all intermediate proxy hops

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

PoolingHttpClientConnectionManager

public PoolingHttpClientConnectionManager()

PoolingHttpClientConnectionManager

public PoolingHttpClientConnectionManager(long timeToLive,
 TimeUnit timeUnit)

PoolingHttpClientConnectionManager

public PoolingHttpClientConnectionManager(Registry<ConnectionSocketFactory> socketFactoryRegistry)

PoolingHttpClientConnectionManager

public PoolingHttpClientConnectionManager(Registry<ConnectionSocketFactory> socketFactoryRegistry,
 DnsResolver dnsResolver)

PoolingHttpClientConnectionManager

public PoolingHttpClientConnectionManager(Registry<ConnectionSocketFactory> socketFactoryRegistry,
 HttpConnectionFactory<HttpRoute,ManagedHttpClientConnection> connFactory)

PoolingHttpClientConnectionManager

public PoolingHttpClientConnectionManager(HttpConnectionFactory<HttpRoute,ManagedHttpClientConnection> connFactory)

PoolingHttpClientConnectionManager

public PoolingHttpClientConnectionManager(Registry<ConnectionSocketFactory> socketFactoryRegistry,
 HttpConnectionFactory<HttpRoute,ManagedHttpClientConnection> connFactory,
 DnsResolver dnsResolver)

PoolingHttpClientConnectionManager

public PoolingHttpClientConnectionManager(Registry<ConnectionSocketFactory> socketFactoryRegistry,
 HttpConnectionFactory<HttpRoute,ManagedHttpClientConnection> connFactory,
 SchemePortResolver schemePortResolver,
 DnsResolver dnsResolver,
 long timeToLive,
 TimeUnit timeUnit)

PoolingHttpClientConnectionManager

public PoolingHttpClientConnectionManager(HttpClientConnectionOperator httpClientConnectionOperator,
 HttpConnectionFactory<HttpRoute,ManagedHttpClientConnection> connFactory,
 long timeToLive,
 TimeUnit timeUnit)

Since:

4.4

Method Details

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

requestConnection

public ConnectionRequest requestConnection(HttpRoute route,
 Object state)

Description copied from interface: HttpClientConnectionManager

Returns a new ConnectionRequest, from which a HttpClientConnection can be obtained or the request can be aborted.

Please note that newly allocated connections can be returned in the closed state. The consumer of that connection is responsible for fully establishing the route the to the connection target by calling connect in order to connect directly to the target or to the first proxy hop, optionally calling upgrade method to upgrade the connection after having executed CONNECT method to all intermediate proxy hops and and finally calling routeComplete to mark the route as fully completed.

Specified by:

requestConnection in interface HttpClientConnectionManager

Parameters:

route - HTTP route of the requested connection.

state - expected state of the connection or null if the connection is not expected to carry any state.

releaseConnection

public void releaseConnection(HttpClientConnection managedConn,
 Object state,
 long keepalive,
 TimeUnit timeUnit)

Description copied from interface: HttpClientConnectionManager

Releases the connection back to the manager making it potentially re-usable by other consumers. Optionally, the maximum period of how long the manager should keep the connection alive can be defined using validDuration and timeUnit parameters.

Specified by:

releaseConnection in interface HttpClientConnectionManager

Parameters:

managedConn - the managed connection to release.

keepalive - the duration of time this connection is valid for reuse.

timeUnit - the time unit.

See Also:

• HttpClientConnectionManager.closeExpiredConnections()

connect

public void connect(HttpClientConnection managedConn,
 HttpRoute route,
 int connectTimeout,
 HttpContext context)
             throws IOException

Description copied from interface: HttpClientConnectionManager

Connects the underlying connection socket to the connection target in case of a direct route or to the first proxy hop in case of a route via a proxy (or multiple proxies).

Specified by:

connect in interface HttpClientConnectionManager

Parameters:

managedConn - the managed connection.

route - the route of the connection.

connectTimeout - connect timeout in milliseconds.

context - the actual HTTP context.

Throws:

IOException

upgrade

public void upgrade(HttpClientConnection managedConn,
 HttpRoute route,
 HttpContext context)
             throws IOException

Description copied from interface: HttpClientConnectionManager

Upgrades the underlying connection socket to TLS/SSL (or another layering protocol) after having executed CONNECT method to all intermediate proxy hops

Specified by:

upgrade in interface HttpClientConnectionManager

Parameters:

managedConn - the managed connection.

route - the route of the connection.

context - the actual HTTP context.

Throws:

IOException

routeComplete

public void routeComplete(HttpClientConnection managedConn,
 HttpRoute route,
 HttpContext context)
                   throws IOException

Description copied from interface: HttpClientConnectionManager

Marks the connection as fully established with all its intermediate hops completed.

Specified by:

routeComplete in interface HttpClientConnectionManager

Parameters:

managedConn - the managed connection.

route - the route of the connection.

context - the actual HTTP context.

Throws:

IOException

shutdown

public void shutdown()

Description copied from interface: HttpClientConnectionManager

Shuts down this connection manager and releases allocated resources. This includes closing all connections, whether they are currently used or not.

Specified by:

shutdown in interface HttpClientConnectionManager

closeIdleConnections

public void closeIdleConnections(long idleTimeout,
 TimeUnit timeUnit)

Description copied from interface: HttpClientConnectionManager

Closes idle connections in the pool.

Open connections in the pool that have not been used for the timespan given by the argument will be closed. Currently allocated connections are not subject to this method. Times will be checked with milliseconds precision

All expired connections will also be closed.

Specified by:

closeIdleConnections in interface HttpClientConnectionManager

Parameters:

idleTimeout - the idle time of connections to be closed

timeUnit - the unit for the idletime

See Also:

• HttpClientConnectionManager.closeExpiredConnections()

closeExpiredConnections

public void closeExpiredConnections()

Description copied from interface: HttpClientConnectionManager

Closes all expired connections in the pool.

Open connections in the pool that have not been used for the timespan defined when the connection was released will be closed. Currently allocated connections are not subject to this method. Times will be checked with milliseconds precision.

Specified by:

closeExpiredConnections in interface HttpClientConnectionManager

getMaxTotal

public int getMaxTotal()

Specified by:

getMaxTotal in interface ConnPoolControl<HttpRoute>

setMaxTotal

public void setMaxTotal(int max)

Specified by:

setMaxTotal in interface ConnPoolControl<HttpRoute>

getDefaultMaxPerRoute

public int getDefaultMaxPerRoute()

Specified by:

getDefaultMaxPerRoute in interface ConnPoolControl<HttpRoute>

setDefaultMaxPerRoute

public void setDefaultMaxPerRoute(int max)

Specified by:

setDefaultMaxPerRoute in interface ConnPoolControl<HttpRoute>

getMaxPerRoute

public int getMaxPerRoute(HttpRoute route)

Specified by:

getMaxPerRoute in interface ConnPoolControl<HttpRoute>

setMaxPerRoute

public void setMaxPerRoute(HttpRoute route,
 int max)

Specified by:

setMaxPerRoute in interface ConnPoolControl<HttpRoute>

getTotalStats

public PoolStats getTotalStats()

Specified by:

getTotalStats in interface ConnPoolControl<HttpRoute>

getStats

public PoolStats getStats(HttpRoute route)

Specified by:

getStats in interface ConnPoolControl<HttpRoute>

getRoutes

public Set<HttpRoute> getRoutes()

Since:

4.4

getDefaultSocketConfig

public SocketConfig getDefaultSocketConfig()

setDefaultSocketConfig

public void setDefaultSocketConfig(SocketConfig defaultSocketConfig)

getDefaultConnectionConfig

public ConnectionConfig getDefaultConnectionConfig()

setDefaultConnectionConfig

public void setDefaultConnectionConfig(ConnectionConfig defaultConnectionConfig)

getSocketConfig

public SocketConfig getSocketConfig(HttpHost host)

setSocketConfig

public void setSocketConfig(HttpHost host,
 SocketConfig socketConfig)

getConnectionConfig

public ConnectionConfig getConnectionConfig(HttpHost host)

setConnectionConfig

public void setConnectionConfig(HttpHost host,
 ConnectionConfig connectionConfig)

getValidateAfterInactivity

public int getValidateAfterInactivity()

Since:

4.4

See Also:

• setValidateAfterInactivity(int)

setValidateAfterInactivity

public void setValidateAfterInactivity(int ms)

Defines period of inactivity in milliseconds after which persistent connections must be re-validated prior to being leased to the consumer. Non-positive value passed to this method disables connection validation. This check helps detect connections that have become stale (half-closed) while kept inactive in the pool.

Since:

4.4

See Also:

• leaseConnection(java.util.concurrent.Future, long, java.util.concurrent.TimeUnit)