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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package jdk.incubator.http;

import java.io.IOException;
import java.lang.System.Logger.Level;
import java.net.InetSocketAddress;
import java.net.StandardSocketOptions;
import java.nio.ByteBuffer;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.SocketChannel;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.concurrent.CompletableFuture;
import jdk.incubator.http.internal.common.FlowTube;
import jdk.incubator.http.internal.common.Log;
import jdk.incubator.http.internal.common.MinimalFuture;
import jdk.incubator.http.internal.common.Utils;

Plain raw TCP connection direct to destination. The connection operates in asynchronous non-blocking mode. All reads and writes are done non-blocking.
/** * Plain raw TCP connection direct to destination. * The connection operates in asynchronous non-blocking mode. * All reads and writes are done non-blocking. */
class PlainHttpConnection extends HttpConnection { private final Object reading = new Object(); protected final SocketChannel chan; private final FlowTube tube; private final PlainHttpPublisher writePublisher = new PlainHttpPublisher(reading); private volatile boolean connected; private boolean closed; // should be volatile to provide proper synchronization(visibility) action final class ConnectEvent extends AsyncEvent { private final CompletableFuture<Void> cf; ConnectEvent(CompletableFuture<Void> cf) { this.cf = cf; } @Override public SelectableChannel channel() { return chan; } @Override public int interestOps() { return SelectionKey.OP_CONNECT; } @Override public void handle() { try { assert !connected : "Already connected"; assert !chan.isBlocking() : "Unexpected blocking channel"; debug.log(Level.DEBUG, "ConnectEvent: finishing connect"); boolean finished = chan.finishConnect(); assert finished : "Expected channel to be connected"; debug.log(Level.DEBUG, "ConnectEvent: connect finished: %s Local addr: %s", finished, chan.getLocalAddress()); connected = true; // complete async since the event runs on the SelectorManager thread cf.completeAsync(() -> null, client().theExecutor()); } catch (Throwable e) { client().theExecutor().execute( () -> cf.completeExceptionally(e)); } } @Override public void abort(IOException ioe) { close(); client().theExecutor().execute( () -> cf.completeExceptionally(ioe)); } } @Override public CompletableFuture<Void> connectAsync() { CompletableFuture<Void> cf = new MinimalFuture<>(); try { assert !connected : "Already connected"; assert !chan.isBlocking() : "Unexpected blocking channel"; boolean finished = false; PrivilegedExceptionAction<Boolean> pa = () -> chan.connect(address); try { finished = AccessController.doPrivileged(pa); } catch (PrivilegedActionException e) { cf.completeExceptionally(e.getCause()); } if (finished) { debug.log(Level.DEBUG, "connect finished without blocking"); connected = true; cf.complete(null); } else { debug.log(Level.DEBUG, "registering connect event"); client().registerEvent(new ConnectEvent(cf)); } } catch (Throwable throwable) { cf.completeExceptionally(throwable); } return cf; } @Override SocketChannel channel() { return chan; } @Override final FlowTube getConnectionFlow() { return tube; } PlainHttpConnection(InetSocketAddress addr, HttpClientImpl client) { super(addr, client); try { this.chan = SocketChannel.open(); chan.configureBlocking(false); int bufsize = client.getReceiveBufferSize(); if (!trySetReceiveBufferSize(bufsize)) { trySetReceiveBufferSize(256*1024); } chan.setOption(StandardSocketOptions.TCP_NODELAY, true); // wrap the connected channel in a Tube for async reading and writing tube = new SocketTube(client(), chan, Utils::getBuffer); } catch (IOException e) { throw new InternalError(e); } } private boolean trySetReceiveBufferSize(int bufsize) { try { chan.setOption(StandardSocketOptions.SO_RCVBUF, bufsize); return true; } catch(IOException x) { debug.log(Level.DEBUG, "Failed to set receive buffer size to %d on %s", bufsize, chan); } return false; } @Override HttpPublisher publisher() { return writePublisher; } @Override public String toString() { return "PlainHttpConnection: " + super.toString(); }
Closes this connection
/** * Closes this connection */
@Override public synchronized void close() { if (closed) { return; } closed = true; try { Log.logTrace("Closing: " + toString()); chan.close(); } catch (IOException e) {} } @Override void shutdownInput() throws IOException { debug.log(Level.DEBUG, "Shutting down input"); chan.shutdownInput(); } @Override void shutdownOutput() throws IOException { debug.log(Level.DEBUG, "Shutting down output"); chan.shutdownOutput(); } @Override ConnectionPool.CacheKey cacheKey() { return new ConnectionPool.CacheKey(address, null); } @Override synchronized boolean connected() { return connected; } @Override boolean isSecure() { return false; } @Override boolean isProxied() { return false; } // Support for WebSocket/RawChannelImpl which unfortunately // still depends on synchronous read/writes. // It should be removed when RawChannelImpl moves to using asynchronous APIs. private static final class PlainDetachedChannel extends DetachedConnectionChannel { final PlainHttpConnection plainConnection; boolean closed; PlainDetachedChannel(PlainHttpConnection conn) { // We're handing the connection channel over to a web socket. // We need the selector manager's thread to stay alive until // the WebSocket is closed. conn.client().webSocketOpen(); this.plainConnection = conn; } @Override SocketChannel channel() { return plainConnection.channel(); } @Override ByteBuffer read() throws IOException { ByteBuffer dst = ByteBuffer.allocate(8192); int n = readImpl(dst); if (n > 0) { return dst; } else if (n == 0) { return Utils.EMPTY_BYTEBUFFER; } else { return null; } } @Override public void close() { HttpClientImpl client = plainConnection.client(); try { plainConnection.close(); } finally { // notify the HttpClientImpl that the websocket is no // no longer operating. synchronized(this) { if (closed == true) return; closed = true; } client.webSocketClose(); } } @Override public long write(ByteBuffer[] buffers, int start, int number) throws IOException { return channel().write(buffers, start, number); } @Override public void shutdownInput() throws IOException { plainConnection.shutdownInput(); } @Override public void shutdownOutput() throws IOException { plainConnection.shutdownOutput(); } private int readImpl(ByteBuffer buf) throws IOException { int mark = buf.position(); int n; n = channel().read(buf); if (n == -1) { return -1; } Utils.flipToMark(buf, mark); return n; } } // Support for WebSocket/RawChannelImpl which unfortunately // still depends on synchronous read/writes. // It should be removed when RawChannelImpl moves to using asynchronous APIs. @Override DetachedConnectionChannel detachChannel() { client().cancelRegistration(channel()); return new PlainDetachedChannel(this); } }