/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.keycloak.client.admin.cli.aesh;
import org.jboss.aesh.console.AeshConsoleImpl;
import java.io.IOException;
import java.io.InputStream;
import java.io.InterruptedIOException;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
/**
* This stream blocks and waits, until there is a stream in the queue.
* It reads the stream to the end, then stops Aesh console.
*
* @author <a href="mailto:mstrukel@redhat.com">Marko Strukelj</a>
*/
public class ValveInputStream extends InputStream {
private BlockingQueue<InputStream> queue = new LinkedBlockingQueue<>(10);
private InputStream current;
private AeshConsoleImpl console;
@Override
public int read() throws IOException {
if (current == null) {
try {
current = queue.take();
} catch (InterruptedException e) {
throw new InterruptedIOException("Signalled to exit");
}
}
int c = current.read();
if (c == -1) {
//current = null;
if (console != null) {
console.stop();
}
}
return c;
}
/**
* For some reason AeshInputStream wants to do blocking read of whole buffers, which for stdin
* results in blocked input.
*/
@Override
public int read(byte b[], int off, int len) throws IOException {
int c = read();
if (c == -1) {
return c;
}
b[off] = (byte) c;
return 1;
}
public void setInputStream(InputStream is) {
if (queue.contains(is)) {
return;
}
queue.add(is);
}
public void setConsole(AeshConsoleImpl console) {
this.console = console;
}
public boolean isStdinAvailable() {
return console.isRunning();
}
}