import org.apache.http.conn.routing.RouteTracker; //导入依赖的package包/类
public HttpPoolEntry(
        final Log log,
        final String id,
        final HttpRoute route,
        final OperatedClientConnection conn,
        final long timeToLive, final TimeUnit tunit) {
    super(id, route, conn, timeToLive, tunit);
    this.log = log;
    this.tracker = new RouteTracker(route);
}
 

import org.apache.http.conn.routing.RouteTracker; //导入依赖的package包/类
/**
 * Opens the underlying connection.
 *
 * @param route         the route along which to open the connection
 * @param context       the context for opening the connection
 * @param params        the parameters for opening the connection
 *
 * @throws IOException  in case of a problem
 */
public void open(final HttpRoute route,
                 final HttpContext context, final HttpParams params)
    throws IOException {

    Args.notNull(route, "Route");
    Args.notNull(params, "HTTP parameters");
    if (this.tracker != null) {
        Asserts.check(!this.tracker.isConnected(), "Connection already open");
    }
    // - collect the arguments
    // - call the operator
    // - update the tracking data
    // In this order, we can be sure that only a successful
    // opening of the connection will be tracked.

    this.tracker = new RouteTracker(route);
    final HttpHost proxy  = route.getProxyHost();

    connOperator.openConnection
        (this.connection,
         (proxy != null) ? proxy : route.getTargetHost(),
         route.getLocalAddress(),
         context, params);

    final RouteTracker localTracker = tracker; // capture volatile

    // If this tracker was reset while connecting,
    // fail early.
    if (localTracker == null) {
        throw new InterruptedIOException("Request aborted");
    }

    if (proxy == null) {
        localTracker.connectTarget(this.connection.isSecure());
    } else {
        localTracker.connectProxy(proxy, this.connection.isSecure());
    }

}
 

import org.apache.http.conn.routing.RouteTracker; //导入依赖的package包/类
/**
 * Obtains a connection.
 *
 * @param route     where the connection should point to
 *
 * @return  a connection that can be used to communicate
 *          along the given route
 */
public ManagedClientConnection getConnection(HttpRoute route, Object state) {
    if (route == null) {
        throw new IllegalArgumentException("Route may not be null.");
    }
    assertStillUp();

    if (log.isDebugEnabled()) {
        log.debug("Get connection for route " + route);
    }

    synchronized (this) {
        if (managedConn != null)
            throw new IllegalStateException(MISUSE_MESSAGE);

        // check re-usability of the connection
        boolean recreate = false;
        boolean shutdown = false;

        // Kill the connection if it expired.
        closeExpiredConnections();

        if (uniquePoolEntry.connection.isOpen()) {
            RouteTracker tracker = uniquePoolEntry.tracker;
            shutdown = (tracker == null || // can happen if method is aborted
                        !tracker.toRoute().equals(route));
        } else {
            // If the connection is not open, create a new PoolEntry,
            // as the connection may have been marked not reusable,
            // due to aborts -- and the PoolEntry should not be reused
            // either.  There's no harm in recreating an entry if
            // the connection is closed.
            recreate = true;
        }

        if (shutdown) {
            recreate = true;
            try {
                uniquePoolEntry.shutdown();
            } catch (IOException iox) {
                log.debug("Problem shutting down connection.", iox);
            }
        }

        if (recreate)
            uniquePoolEntry = new PoolEntry();

        managedConn = new ConnAdapter(uniquePoolEntry, route);

        return managedConn;
    }
}
 

import org.apache.http.conn.routing.RouteTracker; //导入依赖的package包/类
RouteTracker getTracker() {
    return this.tracker;
}
 

import org.apache.http.conn.routing.RouteTracker; //导入依赖的package包/类
/**
 * Opens the underlying connection.
 *
 * @param route         the route along which to open the connection
 * @param context       the context for opening the connection
 * @param params        the parameters for opening the connection
 *
 * @throws IOException  in case of a problem
 */
public void open(HttpRoute route,
                 HttpContext context, HttpParams params)
    throws IOException {

    if (route == null) {
        throw new IllegalArgumentException
            ("Route must not be null.");
    }
    if (params == null) {
        throw new IllegalArgumentException
            ("Parameters must not be null.");
    }
    if ((this.tracker != null) && this.tracker.isConnected()) {
        throw new IllegalStateException("Connection already open.");
    }

    // - collect the arguments
    // - call the operator
    // - update the tracking data
    // In this order, we can be sure that only a successful
    // opening of the connection will be tracked.

    this.tracker = new RouteTracker(route);
    final HttpHost proxy  = route.getProxyHost();

    connOperator.openConnection
        (this.connection,
         (proxy != null) ? proxy : route.getTargetHost(),
         route.getLocalAddress(),
         context, params);

    RouteTracker localTracker = tracker; // capture volatile

    // If this tracker was reset while connecting,
    // fail early.
    if (localTracker == null) {
        throw new InterruptedIOException("Request aborted");
    }

    if (proxy == null) {
        localTracker.connectTarget(this.connection.isSecure());
    } else {
        localTracker.connectProxy(proxy, this.connection.isSecure());
    }

}
 

import org.apache.http.conn.routing.RouteTracker; //导入依赖的package包/类
/**
 * Obtains a connection.
 *
 * @param route     where the connection should point to
 *
 * @return  a connection that can be used to communicate
 *          along the given route
 */
public ManagedClientConnection getConnection(final HttpRoute route, final Object state) {
    Args.notNull(route, "Route");
    assertStillUp();

    if (log.isDebugEnabled()) {
        log.debug("Get connection for route " + route);
    }

    synchronized (this) {

        Asserts.check(managedConn == null, MISUSE_MESSAGE);

        // check re-usability of the connection
        boolean recreate = false;
        boolean shutdown = false;

        // Kill the connection if it expired.
        closeExpiredConnections();

        if (uniquePoolEntry.connection.isOpen()) {
            final RouteTracker tracker = uniquePoolEntry.tracker;
            shutdown = (tracker == null || // can happen if method is aborted
                        !tracker.toRoute().equals(route));
        } else {
            // If the connection is not open, create a new PoolEntry,
            // as the connection may have been marked not reusable,
            // due to aborts -- and the PoolEntry should not be reused
            // either.  There's no harm in recreating an entry if
            // the connection is closed.
            recreate = true;
        }

        if (shutdown) {
            recreate = true;
            try {
                uniquePoolEntry.shutdown();
            } catch (final IOException iox) {
                log.debug("Problem shutting down connection.", iox);
            }
        }

        if (recreate) {
            uniquePoolEntry = new PoolEntry();
        }

        managedConn = new ConnAdapter(uniquePoolEntry, route);

        return managedConn;
    }
}
 

import org.apache.http.conn.routing.RouteTracker; //导入依赖的package包/类
/**
 * Obtains a connection.
 *
 * @param route     where the connection should point to
 *
 * @return  a connection that can be used to communicate
 *          along the given route
 */
public synchronized ManagedClientConnection getConnection(HttpRoute route, Object state) {
    if (route == null) {
        throw new IllegalArgumentException("Route may not be null.");
    }
    assertStillUp();

    if (log.isDebugEnabled()) {
        log.debug("Get connection for route " + route);
    }

    if (managedConn != null)
        throw new IllegalStateException(MISUSE_MESSAGE);

    // check re-usability of the connection
    boolean recreate = false;
    boolean shutdown = false;
    
    // Kill the connection if it expired.
    closeExpiredConnections();
    
    if (uniquePoolEntry.connection.isOpen()) {
        RouteTracker tracker = uniquePoolEntry.tracker;
        shutdown = (tracker == null || // can happen if method is aborted
                    !tracker.toRoute().equals(route));
    } else {
        // If the connection is not open, create a new PoolEntry,
        // as the connection may have been marked not reusable,
        // due to aborts -- and the PoolEntry should not be reused
        // either.  There's no harm in recreating an entry if
        // the connection is closed.
        recreate = true;
    }

    if (shutdown) {
        recreate = true;
        try {
            uniquePoolEntry.shutdown();
        } catch (IOException iox) {
            log.debug("Problem shutting down connection.", iox);
        }
    }
    
    if (recreate)
        uniquePoolEntry = new PoolEntry();

    managedConn = new ConnAdapter(uniquePoolEntry, route);

    return managedConn;
}
 

import org.apache.http.conn.routing.RouteTracker; //导入依赖的package包/类
/**
 * Opens the underlying connection.
 *
 * @param route         the route along which to open the connection
 * @param context       the context for opening the connection
 * @param params        the parameters for opening the connection
 *
 * @throws IOException  in case of a problem
 */
public void open(HttpRoute route,
                 HttpContext context, HttpParams params)
    throws IOException {

    if (route == null) {
        throw new IllegalArgumentException
            ("Route must not be null.");
    }
    if (params == null) {
        throw new IllegalArgumentException
            ("Parameters must not be null.");
    }
    if ((this.tracker != null) && this.tracker.isConnected()) {
        throw new IllegalStateException("Connection already open.");
    }

    // - collect the arguments
    // - call the operator
    // - update the tracking data
    // In this order, we can be sure that only a successful
    // opening of the connection will be tracked.

    this.tracker = new RouteTracker(route);
    final HttpHost proxy  = route.getProxyHost();

    connOperator.openConnection
        (this.connection,
         (proxy != null) ? proxy : route.getTargetHost(),
         route.getLocalAddress(),
         context, params);

    RouteTracker localTracker = tracker; // capture volatile        

    // If this tracker was reset while connecting,
    // fail early.
    if (localTracker == null) {
        throw new IOException("Request aborted");
    }

    if (proxy == null) {
        localTracker.connectTarget(this.connection.isSecure());
    } else {
        localTracker.connectProxy(proxy, this.connection.isSecure());
    }

}