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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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
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package jdk.incubator.http;

import java.io.IOException;
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.util.concurrent.CompletableFuture;
import java.util.function.Consumer;
import java.util.function.Supplier;

import jdk.incubator.http.internal.common.AsyncWriteQueue;
import jdk.incubator.http.internal.common.ByteBufferReference;
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. 2 modes 1) Blocking used by http/1. In this case the connect is actually non blocking but the request is sent blocking. The first byte of a response is received non-blocking and the remainder of the response is received blocking 2) Non-blocking. In this case (for http/2) the connection is actually opened blocking but all reads and writes are done non-blocking under the control of a Http2Connection object.
/** * Plain raw TCP connection direct to destination. 2 modes * 1) Blocking used by http/1. In this case the connect is actually non * blocking but the request is sent blocking. The first byte of a response * is received non-blocking and the remainder of the response is received * blocking * 2) Non-blocking. In this case (for http/2) the connection is actually opened * blocking but all reads and writes are done non-blocking under the * control of a Http2Connection object. */
class PlainHttpConnection extends HttpConnection implements AsyncConnection { protected final SocketChannel chan; private volatile boolean connected; private boolean closed; // should be volatile to provide proper synchronization(visibility) action private volatile Consumer<ByteBufferReference> asyncReceiver; private volatile Consumer<Throwable> errorReceiver; private volatile Supplier<ByteBufferReference> readBufferSupplier; private boolean asyncReading; private final AsyncWriteQueue asyncOutputQ = new AsyncWriteQueue(this::asyncOutput); private final Object reading = new Object(); @Override public void startReading() { try { synchronized(reading) { asyncReading = true; } client.registerEvent(new ReadEvent()); } catch (IOException e) { shutdown(); } } @Override public void stopAsyncReading() { synchronized(reading) { asyncReading = false; } client.cancelRegistration(chan); } class ConnectEvent extends AsyncEvent { CompletableFuture<Void> cf; ConnectEvent(CompletableFuture<Void> cf) { super(AsyncEvent.BLOCKING); this.cf = cf; } @Override public SelectableChannel channel() { return chan; } @Override public int interestOps() { return SelectionKey.OP_CONNECT; } @Override public void handle() { try { chan.finishConnect(); } catch (IOException e) { cf.completeExceptionally(e); return; } connected = true; cf.complete(null); } @Override public void abort() { close(); } } @Override public CompletableFuture<Void> connectAsync() { CompletableFuture<Void> plainFuture = new MinimalFuture<>(); try { chan.configureBlocking(false); chan.connect(address); client.registerEvent(new ConnectEvent(plainFuture)); } catch (IOException e) { plainFuture.completeExceptionally(e); } return plainFuture; } @Override public void connect() throws IOException { chan.connect(address); connected = true; } @Override SocketChannel channel() { return chan; } PlainHttpConnection(InetSocketAddress addr, HttpClientImpl client) { super(addr, client); try { this.chan = SocketChannel.open(); int bufsize = client.getReceiveBufferSize(); chan.setOption(StandardSocketOptions.SO_RCVBUF, bufsize); chan.setOption(StandardSocketOptions.TCP_NODELAY, true); } catch (IOException e) { throw new InternalError(e); } } @Override long write(ByteBuffer[] buffers, int start, int number) throws IOException { if (getMode() != Mode.ASYNC) { return chan.write(buffers, start, number); } // async buffers = Utils.reduce(buffers, start, number); long n = Utils.remaining(buffers); asyncOutputQ.put(ByteBufferReference.toReferences(buffers)); flushAsync(); return n; } @Override long write(ByteBuffer buffer) throws IOException { if (getMode() != Mode.ASYNC) { return chan.write(buffer); } // async long n = buffer.remaining(); asyncOutputQ.put(ByteBufferReference.toReferences(buffer)); flushAsync(); return n; } // handle registered WriteEvent; invoked from SelectorManager thread void flushRegistered() { if (getMode() == Mode.ASYNC) { try { asyncOutputQ.flushDelayed(); } catch (IOException e) { // Only IOException caused by closed Queue is expected here shutdown(); } } } @Override public void writeAsync(ByteBufferReference[] buffers) throws IOException { if (getMode() != Mode.ASYNC) { chan.write(ByteBufferReference.toBuffers(buffers)); ByteBufferReference.clear(buffers); } else { asyncOutputQ.put(buffers); } } @Override public void writeAsyncUnordered(ByteBufferReference[] buffers) throws IOException { if (getMode() != Mode.ASYNC) { chan.write(ByteBufferReference.toBuffers(buffers)); ByteBufferReference.clear(buffers); } else { // Unordered frames are sent before existing frames. asyncOutputQ.putFirst(buffers); } } @Override public void flushAsync() throws IOException { if (getMode() == Mode.ASYNC) { asyncOutputQ.flush(); } } @Override public void enableCallback() { // not used assert false; } void asyncOutput(ByteBufferReference[] refs, AsyncWriteQueue delayCallback) { try { ByteBuffer[] bufs = ByteBufferReference.toBuffers(refs); while (Utils.remaining(bufs) > 0) { long n = chan.write(bufs); if (n == 0) { delayCallback.setDelayed(refs); client.registerEvent(new WriteEvent()); return; } } ByteBufferReference.clear(refs); } catch (IOException e) { shutdown(); } } @Override public String toString() { return "PlainHttpConnection: " + super.toString(); }
Close this connection
/** * Close this connection */
@Override public synchronized void close() { if (closed) { return; } closed = true; try { Log.logError("Closing: " + toString()); chan.close(); } catch (IOException e) {} } @Override void shutdownInput() throws IOException { chan.shutdownInput(); } @Override void shutdownOutput() throws IOException { chan.shutdownOutput(); } void shutdown() { close(); errorReceiver.accept(new IOException("Connection aborted")); } void asyncRead() { synchronized (reading) { try { while (asyncReading) { ByteBufferReference buf = readBufferSupplier.get(); int n = chan.read(buf.get()); if (n == -1) { throw new IOException(); } if (n == 0) { buf.clear(); return; } buf.get().flip(); asyncReceiver.accept(buf); } } catch (IOException e) { shutdown(); } } } @Override protected ByteBuffer readImpl() 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; } } private int readImpl(ByteBuffer buf) throws IOException { int mark = buf.position(); int n; // FIXME: this hack works in conjunction with the corresponding change // in jdk.incubator.http.RawChannel.registerEvent //if ((n = buffer.remaining()) != 0) { //buf.put(buffer); //} else { n = chan.read(buf); //} if (n == -1) { return -1; } Utils.flipToMark(buf, mark); // String s = "Receive (" + n + " bytes) "; //debugPrint(s, buf); return n; } @Override ConnectionPool.CacheKey cacheKey() { return new ConnectionPool.CacheKey(address, null); } @Override synchronized boolean connected() { return connected; } // used for all output in HTTP/2 class WriteEvent extends AsyncEvent { WriteEvent() { super(0); } @Override public SelectableChannel channel() { return chan; } @Override public int interestOps() { return SelectionKey.OP_WRITE; } @Override public void handle() { flushRegistered(); } @Override public void abort() { shutdown(); } } // used for all input in HTTP/2 class ReadEvent extends AsyncEvent { ReadEvent() { super(AsyncEvent.REPEATING); // && !BLOCKING } @Override public SelectableChannel channel() { return chan; } @Override public int interestOps() { return SelectionKey.OP_READ; } @Override public void handle() { asyncRead(); } @Override public void abort() { shutdown(); } @Override public String toString() { return super.toString() + "/" + chan; } } // used in blocking channels only class ReceiveResponseEvent extends AsyncEvent { CompletableFuture<Void> cf; ReceiveResponseEvent(CompletableFuture<Void> cf) { super(AsyncEvent.BLOCKING); this.cf = cf; } @Override public SelectableChannel channel() { return chan; } @Override public void handle() { cf.complete(null); } @Override public int interestOps() { return SelectionKey.OP_READ; } @Override public void abort() { close(); } @Override public String toString() { return super.toString() + "/" + chan; } } @Override boolean isSecure() { return false; } @Override boolean isProxied() { return false; } @Override public void setAsyncCallbacks(Consumer<ByteBufferReference> asyncReceiver, Consumer<Throwable> errorReceiver, Supplier<ByteBufferReference> readBufferSupplier) { this.asyncReceiver = asyncReceiver; this.errorReceiver = errorReceiver; this.readBufferSupplier = readBufferSupplier; } @Override CompletableFuture<Void> whenReceivingResponse() { CompletableFuture<Void> cf = new MinimalFuture<>(); try { ReceiveResponseEvent evt = new ReceiveResponseEvent(cf); client.registerEvent(evt); } catch (IOException e) { cf.completeExceptionally(e); } return cf; } }