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/*
* Copyright 2015 Open Networking Laboratory
*
* 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.onlab.nio.service;
import java.nio.ByteBuffer;
import java.nio.channels.ByteChannel;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.atomic.AtomicInteger;
import org.onlab.nio.IOLoop;
import org.onlab.nio.MessageStream;
import org.onlab.packet.IpAddress;
import org.onlab.packet.IpAddress.Version;
import org.onosproject.store.cluster.messaging.Endpoint;
import com.google.common.base.Charsets;
/**
* Default bi-directional message stream for transferring messages to & from the
* network via two byte buffers.
*/
public class DefaultMessageStream extends MessageStream<DefaultMessage> {
private final CompletableFuture<Void> connectFuture = new CompletableFuture<>();
public DefaultMessageStream(
IOLoop<DefaultMessage, ?> loop,
ByteChannel byteChannel,
int bufferSize,
int maxIdleMillis) {
super(loop, byteChannel, bufferSize, maxIdleMillis);
}
public CompletableFuture<DefaultMessageStream> connectedFuture() {
return connectFuture.thenApply(v -> this);
}
private final AtomicInteger messageLength = new AtomicInteger(-1);
@Override
protected DefaultMessage read(ByteBuffer buffer) {
if (messageLength.get() == -1) {
// check if we can read the message length.
if (buffer.remaining() < Integer.BYTES) {
return null;
} else {
messageLength.set(buffer.getInt());
}
}
if (buffer.remaining() < messageLength.get()) {
return null;
}
long id = buffer.getLong();
Version ipVersion = buffer.get() == 0x0 ? Version.INET : Version.INET6;
byte[] octects = new byte[IpAddress.byteLength(ipVersion)];
buffer.get(octects);
IpAddress senderIp = IpAddress.valueOf(ipVersion, octects);
int senderPort = buffer.getInt();
int messageTypeByteLength = buffer.getInt();
byte[] messageTypeBytes = new byte[messageTypeByteLength];
buffer.get(messageTypeBytes);
String messageType = new String(messageTypeBytes, Charsets.UTF_8);
int payloadLength = buffer.getInt();
byte[] payloadBytes = new byte[payloadLength];
buffer.get(payloadBytes);
// reset for next message
messageLength.set(-1);
return new DefaultMessage(id, new Endpoint(senderIp, senderPort), messageType, payloadBytes);
}
@Override
protected void write(DefaultMessage message, ByteBuffer buffer) {
Endpoint sender = message.sender();
byte[] messageTypeBytes = message.type().getBytes(Charsets.UTF_8);
IpAddress senderIp = sender.host();
byte[] ipOctets = senderIp.toOctets();
byte[] payload = message.payload();
int messageLength = 21 + ipOctets.length + messageTypeBytes.length + payload.length;
buffer.putInt(messageLength);
buffer.putLong(message.id());
if (senderIp.version() == Version.INET) {
buffer.put((byte) 0x0);
} else {
buffer.put((byte) 0x1);
}
buffer.put(ipOctets);
// write sender port
buffer.putInt(sender.port());
// write length of message type
buffer.putInt(messageTypeBytes.length);
// write message type bytes
buffer.put(messageTypeBytes);
// write payload length
buffer.putInt(payload.length);
// write payload.
buffer.put(payload);
}
/**
* Callback invoked when the stream is successfully connected.
*/
public void connected() {
connectFuture.complete(null);
}
/**
* Callback invoked when the stream fails to connect.
* @param cause failure cause
*/
public void connectFailed(Throwable cause) {
connectFuture.completeExceptionally(cause);
}
}
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