langtools/src/jdk.jshell/share/classes/jdk/jshell/execution/DemultiplexInput.java
8179531: JShell: fails to provide bytecode for dynamically created lambdas
Summary: Adding support for getResource(s) to the JShell's ClassLoader
Reviewed-by: psandoz, rfield
/*
* Copyright (c) 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
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*/
package jdk.jshell.execution;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;
/**
* Read from an InputStream which has been packetized and write its contents
* to the named OutputStreams.
*
* @author Jan Lahoda
* @see Util#demultiplexInput(java.io.InputStream, java.io.OutputStream, java.io.OutputStream, java.io.OutputStream...)
*/
class DemultiplexInput extends Thread {
private final DataInputStream delegate;
private final Map<String, OutputStream> io;
private final Iterable<OutputStream> closeList;
DemultiplexInput(InputStream input, Map<String, OutputStream> io, Iterable<OutputStream> closeList) {
super("output reader");
setDaemon(true);
this.delegate = new DataInputStream(input);
this.io = io;
this.closeList = closeList;
}
@Override
public void run() {
try {
while (true) {
int nameLen = delegate.read();
if (nameLen == (-1)) {
break;
}
byte[] name = new byte[nameLen];
DemultiplexInput.this.delegate.readFully(name);
int dataLen = delegate.read();
byte[] data = new byte[dataLen];
DemultiplexInput.this.delegate.readFully(data);
String chan = new String(name, "UTF-8");
OutputStream out = io.get(chan);
if (out == null) {
debug("Unexpected channel name: %s", chan);
} else {
out.write(data);
}
}
} catch (IOException ex) {
debug(ex, "Failed reading output");
} finally {
for (OutputStream out : closeList) {
try {
out.close();
} catch (IOException ex) {
debug(ex, "Failed reading output");
}
}
}
}
/**
* Log debugging information. Arguments as for {@code printf}.
*
* @param format a format string as described in Format string syntax
* @param args arguments referenced by the format specifiers in the format
* string.
*/
private void debug(String format, Object... args) {
// Reserved for future logging
}
/**
* Log a serious unexpected internal exception.
*
* @param ex the exception
* @param where a description of the context of the exception
*/
private void debug(Throwable ex, String where) {
// Reserved for future logging
}
}