/* 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 java.nio;
import android.system.ErrnoException;
import java.io.Closeable;
import java.io.FileDescriptor;
import java.io.IOException;
import java.nio.channels.Pipe;
import java.nio.channels.SocketChannel;
import java.nio.channels.spi.SelectorProvider;
import libcore.io.IoUtils;
import libcore.io.Libcore;
import static android.system.OsConstants.*;
/*
* Implements {@link java.nio.channels.Pipe}.
*/
final class PipeImpl extends Pipe {
private final PipeSinkChannel sink;
private final PipeSourceChannel source;
public PipeImpl(SelectorProvider selectorProvider) throws IOException {
try {
FileDescriptor fd1 = new FileDescriptor();
FileDescriptor fd2 = new FileDescriptor();
Libcore.os.socketpair(AF_UNIX, SOCK_STREAM, 0, fd1, fd2);
// It doesn't matter which file descriptor we use for which end;
// they're guaranteed to be indistinguishable.
this.sink = new PipeSinkChannel(selectorProvider, fd1);
this.source = new PipeSourceChannel(selectorProvider, fd2);
} catch (ErrnoException errnoException) {
throw errnoException.rethrowAsIOException();
}
}
@Override public SinkChannel sink() {
return sink;
}
@Override public SourceChannel source() {
return source;
}
private class PipeSourceChannel extends Pipe.SourceChannel implements FileDescriptorChannel {
private final FileDescriptor fd;
private final SocketChannel channel;
private PipeSourceChannel(SelectorProvider selectorProvider, FileDescriptor fd) throws IOException {
super(selectorProvider);
this.fd = fd;
this.channel = new SocketChannelImpl(selectorProvider, fd);
}
@Override protected void implCloseSelectableChannel() throws IOException {
channel.close();
}
@Override protected void implConfigureBlocking(boolean blocking) throws IOException {
IoUtils.setBlocking(getFD(), blocking);
}
public int read(ByteBuffer buffer) throws IOException {
return channel.read(buffer);
}
public long read(ByteBuffer[] buffers) throws IOException {
return channel.read(buffers);
}
public long read(ByteBuffer[] buffers, int offset, int length) throws IOException {
return channel.read(buffers, offset, length);
}
public FileDescriptor getFD() {
return fd;
}
}
private class PipeSinkChannel extends Pipe.SinkChannel implements FileDescriptorChannel {
private final FileDescriptor fd;
private final SocketChannel channel;
private PipeSinkChannel(SelectorProvider selectorProvider, FileDescriptor fd) throws IOException {
super(selectorProvider);
this.fd = fd;
this.channel = new SocketChannelImpl(selectorProvider, fd);
}
@Override protected void implCloseSelectableChannel() throws IOException {
channel.close();
}
@Override protected void implConfigureBlocking(boolean blocking) throws IOException {
IoUtils.setBlocking(getFD(), blocking);
}
public int write(ByteBuffer buffer) throws IOException {
return channel.write(buffer);
}
public long write(ByteBuffer[] buffers) throws IOException {
return channel.write(buffers);
}
public long write(ByteBuffer[] buffers, int offset, int length) throws IOException {
return channel.write(buffers, offset, length);
}
public FileDescriptor getFD() {
return fd;
}
}
}