/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.synapse.transport.nhttp.util;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.nio.channels.Pipe;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.nio.channels.spi.SelectorProvider;
import java.nio.ByteBuffer;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;
import java.io.IOException;
import java.io.File;
/**
* Create a Pipe suitable for the runtime platform. The java.nio.channels.Pipe implementation
* on Windows uses TCP ports bound to the loopback interface to implement a Pipe. In Linux and
* Solaris this is passed to a native method.
*/
public class PipeImpl {
private static final Log log = LogFactory.getLog(PipeImpl.class);
private ReadableByteChannel source;
private WritableByteChannel sink;
private PipedOutputStream pipedOut;
protected static boolean useNative;
static {
// platfom default - Unix - native, Windows - Piped Streams
if ("/".equals(File.separator)) {
useNative = true;
}
// has this been overridden?
String option = System.getProperty("native_pipes");
if (option != null) {
// if an option is specified, use it
if ("true".equals(option)) {
useNative = true;
} else if ("false".equals(option)) {
useNative = false;
}
}
if (useNative) {
log.info("Using native OS Pipes for event-driven to stream IO bridging");
} else {
log.info("Using simulated buffered Pipes for event-driven to stream IO bridging");
}
}
public PipeImpl() throws IOException {
if (useNative) {
Pipe pipe = Pipe.open();
source = pipe.source();
sink = pipe.sink();
} else {
PipedInputStream pipedIn = new PipedInputStream();
try {
pipedOut = new PipedOutputStream(pipedIn);
} catch (IOException e) {
e.printStackTrace();
}
source = Channels.newChannel(pipedIn);
sink = Channels.newChannel(pipedOut);
}
}
public ReadableByteChannel source() {
return source;
}
public WritableByteChannel sink() {
return sink;
}
}