| /* |
| * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * 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. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.incubator.http; |
| |
| import jdk.incubator.http.internal.common.ByteBufferReference; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.function.Consumer; |
| import java.util.function.Supplier; |
| |
| /** |
| * Implemented by classes that offer an asynchronous interface. |
| * |
| * PlainHttpConnection, AsyncSSLConnection AsyncSSLDelegate. |
| * |
| * setAsyncCallbacks() is called to set the callback for reading |
| * and error notification. Reads all happen on the selector thread, which |
| * must not block. |
| * |
| * Writing uses the same write() methods as used in blocking mode. |
| * Queues are employed on the writing side to buffer data while it is waiting |
| * to be sent. This strategy relies on HTTP/2 protocol flow control to stop |
| * outgoing queue from continually growing. Writes can be initiated by the |
| * calling thread, but if socket becomes full then the queue is emptied by |
| * the selector thread |
| */ |
| interface AsyncConnection { |
| |
| /** |
| * Enables asynchronous sending and receiving mode. The given async |
| * receiver will receive all incoming data. asyncInput() will be called |
| * to trigger reads. asyncOutput() will be called to drive writes. |
| * |
| * The errorReceiver callback must be called when any fatal exception |
| * occurs. Connection is assumed to be closed afterwards. |
| */ |
| void setAsyncCallbacks(Consumer<ByteBufferReference> asyncReceiver, |
| Consumer<Throwable> errorReceiver, |
| Supplier<ByteBufferReference> readBufferSupplier); |
| |
| |
| |
| /** |
| * Does whatever is required to start reading. Usually registers |
| * an event with the selector thread. |
| */ |
| void startReading(); |
| |
| /** |
| * In async mode, this method puts buffers at the end of the send queue. |
| * When in async mode, calling this method should later be followed by |
| * subsequent flushAsync invocation. |
| * That allows multiple threads to put buffers into the queue while some other |
| * thread is writing. |
| */ |
| void writeAsync(ByteBufferReference[] buffers) throws IOException; |
| |
| /** |
| * In async mode, this method may put buffers at the beginning of send queue, |
| * breaking frames sequence and allowing to write these buffers before other |
| * buffers in the queue. |
| * When in async mode, calling this method should later be followed by |
| * subsequent flushAsync invocation. |
| * That allows multiple threads to put buffers into the queue while some other |
| * thread is writing. |
| */ |
| void writeAsyncUnordered(ByteBufferReference[] buffers) throws IOException; |
| |
| /** |
| * This method should be called after any writeAsync/writeAsyncUnordered |
| * invocation. |
| * If there is a race to flushAsync from several threads one thread |
| * (race winner) capture flush operation and write the whole queue content. |
| * Other threads (race losers) exits from the method (not blocking) |
| * and continue execution. |
| */ |
| void flushAsync() throws IOException; |
| |
| } |