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/*
* Copyright (c) 2016, 2018, 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.
*
* 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.
*/
import java.io.*;
import java.nio.ByteBuffer;
import jdk.internal.net.http.frame.DataFrame;
/**
* OutputStream. Incoming window updates handled by the main connection
* reader thread.
*/
@SuppressWarnings({"rawtypes","unchecked"})
class BodyOutputStream extends OutputStream {
final static byte[] EMPTY_BARRAY = new byte[0];
final int streamid;
int window;
volatile boolean closed;
boolean goodToGo = false; // not allowed to send until headers sent
final Http2TestServerConnection conn;
final Queue outputQ;
BodyOutputStream(int streamid, int initialWindow, Http2TestServerConnection conn) {
this.window = initialWindow;
this.streamid = streamid;
this.conn = conn;
this.outputQ = conn.outputQ;
conn.registerStreamWindowUpdater(streamid, this::updateWindow);
}
// called from connection reader thread as all incoming window
// updates are handled there.
synchronized void updateWindow(int update) {
window += update;
notifyAll();
}
void waitForWindow(int demand) throws InterruptedException {
// first wait for the connection window
conn.obtainConnectionWindow(demand);
// now wait for the stream window
synchronized (this) {
while (demand > 0) {
int n = Math.min(demand, window);
demand -= n;
window -= n;
if (demand > 0) {
wait();
}
}
}
}
void goodToGo() {
goodToGo = true;
}
@Override
public void write(byte[] buf, int offset, int len) throws IOException {
if (closed) {
throw new IOException("closed");
}
if (!goodToGo) {
throw new IllegalStateException("sendResponseHeaders must be called first");
}
try {
int max = conn.getMaxFrameSize();
while (len > 0) {
int n = len > max ? max : len;
waitForWindow(n);
send(buf, offset, n, 0);
offset += n;
len -= n;
}
} catch (InterruptedException ex) {
throw new IOException(ex);
}
}
private void send(byte[] buf, int offset, int len, int flags) throws IOException {
ByteBuffer buffer = ByteBuffer.allocate(len);
buffer.put(buf, offset, len);
buffer.flip();
assert streamid != 0;
DataFrame df = new DataFrame(streamid, flags, buffer);
outputQ.put(df);
}
byte[] one = new byte[1];
@Override
public void write(int b) throws IOException {
one[0] = (byte) b;
write(one, 0, 1);
}
void closeInternal() {
closed = true;
}
@Override
public void close() {
if (closed) return;
synchronized (this) {
if (closed) return;
closed = true;
}
try {
send(EMPTY_BARRAY, 0, 0, DataFrame.END_STREAM);
} catch (IOException ex) {
System.err.println("TestServer: OutputStream.close exception: " + ex);
ex.printStackTrace();
}
}
}
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