org.apache.http.conn
Interface HttpClientConnectionManager

All Known Implementing Classes:
BasicHttpClientConnectionManager, PoolingHttpClientConnectionManager

public interface HttpClientConnectionManager

Represents a manager of persistent client connections.

The purpose of an HTTP connection manager is to serve as a factory for new HTTP connections, manage persistent connections and synchronize access to persistent connections making sure that only one thread of execution can have access to a connection at a time.

Implementations of this interface must be thread-safe. Access to shared data must be synchronized as methods of this interface may be executed from multiple threads.

Since:
4.3

Method Summary
 void closeExpiredConnections()
          Closes all expired connections in the pool.
 void closeIdleConnections(long idletime, TimeUnit tunit)
          Closes idle connections in the pool.
 void connect(HttpClientConnection conn, 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).
 void releaseConnection(HttpClientConnection conn, Object newState, long validDuration, 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 conn, HttpRoute route, HttpContext context)
          Marks the connection as fully established with all its intermediate hops completed.
 void shutdown()
          Shuts down this connection manager and releases allocated resources.
 void upgrade(HttpClientConnection conn, 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
 

Method Detail

requestConnection

ConnectionRequest requestConnection(HttpRoute route,
                                    Object state)
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.

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

void releaseConnection(HttpClientConnection conn,
                       Object newState,
                       long validDuration,
                       TimeUnit timeUnit)
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.

Parameters:
conn - the managed connection to release.
validDuration - the duration of time this connection is valid for reuse.
timeUnit - the time unit.
See Also:
closeExpiredConnections()

connect

void connect(HttpClientConnection conn,
             HttpRoute route,
             int connectTimeout,
             HttpContext context)
             throws IOException
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).

Parameters:
conn - the managed connection.
route - the route of the connection.
connectTimeout - connect timeout in milliseconds.
context - the actual HTTP context.
Throws:
IOException

upgrade

void upgrade(HttpClientConnection conn,
             HttpRoute route,
             HttpContext context)
             throws IOException
Upgrades the underlying connection socket to TLS/SSL (or another layering protocol) after having executed CONNECT method to all intermediate proxy hops

Parameters:
conn - the managed connection.
route - the route of the connection.
context - the actual HTTP context.
Throws:
IOException

routeComplete

void routeComplete(HttpClientConnection conn,
                   HttpRoute route,
                   HttpContext context)
                   throws IOException
Marks the connection as fully established with all its intermediate hops completed.

Parameters:
conn - the managed connection.
route - the route of the connection.
context - the actual HTTP context.
Throws:
IOException

closeIdleConnections

void closeIdleConnections(long idletime,
                          TimeUnit tunit)
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.

Parameters:
idletime - the idle time of connections to be closed
tunit - the unit for the idletime
See Also:
closeExpiredConnections()

closeExpiredConnections

void closeExpiredConnections()
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.


shutdown

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



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