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package com.facebook.presto.jdbc.internal.apache.http.conn;

import java.io.IOException;
import java.util.concurrent.TimeUnit;

import com.facebook.presto.jdbc.internal.apache.http.HttpClientConnection;
import com.facebook.presto.jdbc.internal.apache.http.conn.routing.HttpRoute;
import com.facebook.presto.jdbc.internal.apache.http.protocol.HttpContext;

/**
 * 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 */ public interface HttpClientConnectionManager { /** * Returns a new {@link ConnectionRequest}, from which a * {@link 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 {@link #connect(com.facebook.presto.jdbc.internal.apache.http.HttpClientConnection, * com.facebook.presto.jdbc.internal.apache.http.conn.routing.HttpRoute, int, * com.facebook.presto.jdbc.internal.apache.http.protocol.HttpContext) connect} in order to connect * directly to the target or to the first proxy hop, optionally calling * {@link #upgrade(com.facebook.presto.jdbc.internal.apache.http.HttpClientConnection, * com.facebook.presto.jdbc.internal.apache.http.conn.routing.HttpRoute, * com.facebook.presto.jdbc.internal.apache.http.protocol.HttpContext) upgrade} method to upgrade * the connection after having executed {@code CONNECT} method to * all intermediate proxy hops and and finally calling {@link #routeComplete( * com.facebook.presto.jdbc.internal.apache.http.HttpClientConnection, * com.facebook.presto.jdbc.internal.apache.http.conn.routing.HttpRoute, * com.facebook.presto.jdbc.internal.apache.http.protocol.HttpContext) routeComplete} to mark the route * as fully completed. *

* * @param route HTTP route of the requested connection. * @param state expected state of the connection or {@code null} * if the connection is not expected to carry any state. */ ConnectionRequest requestConnection(HttpRoute route, Object state); /** * 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 {@code validDuration} and {@code timeUnit} * parameters. * * @param conn the managed connection to release. * @param validDuration the duration of time this connection is valid for reuse. * @param timeUnit the time unit. * * @see #closeExpiredConnections() */ void releaseConnection( HttpClientConnection conn, Object newState, long validDuration, TimeUnit timeUnit); /** * 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). * * @param conn the managed connection. * @param route the route of the connection. * @param connectTimeout connect timeout in milliseconds. * @param context the actual HTTP context. * @throws IOException */ void connect( HttpClientConnection conn, HttpRoute route, int connectTimeout, HttpContext context) throws IOException; /** * Upgrades the underlying connection socket to TLS/SSL (or another layering * protocol) after having executed {@code CONNECT} method to all * intermediate proxy hops * * @param conn the managed connection. * @param route the route of the connection. * @param context the actual HTTP context. * @throws IOException */ void upgrade( HttpClientConnection conn, HttpRoute route, HttpContext context) throws IOException; /** * Marks the connection as fully established with all its intermediate * hops completed. * * @param conn the managed connection. * @param route the route of the connection. * @param context the actual HTTP context. * @throws IOException */ void routeComplete( HttpClientConnection conn, HttpRoute route, HttpContext context) throws IOException; /** * 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. *

* * @param idletime the idle time of connections to be closed * @param tunit the unit for the {@code idletime} * * @see #closeExpiredConnections() */ void closeIdleConnections(long idletime, TimeUnit tunit); /** * 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. *

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




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