/*
* Copyright 2015 Kevin Herron
*
* 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 com.digitalpetri.opcua.stack.core.channel.messages;
import javax.annotation.Nonnull;
import com.digitalpetri.opcua.stack.core.serialization.binary.BinaryDecoder;
import com.digitalpetri.opcua.stack.core.serialization.binary.BinaryEncoder;
import com.digitalpetri.opcua.stack.core.util.annotations.UInt32Primitive;
import com.google.common.base.MoreObjects;
import io.netty.buffer.ByteBuf;
import static com.google.common.base.Preconditions.checkArgument;
public class HelloMessage {
@UInt32Primitive
private final long protocolVersion;
@UInt32Primitive
private final long receiveBufferSize;
@UInt32Primitive
private final long sendBufferSize;
@UInt32Primitive
private final long maxMessageSize;
@UInt32Primitive
private final long maxChunkCount;
private final String endpointUrl;
/**
* @param protocolVersion the latest version of the OPC UA TCP protocol supported by the Client.
* @param receiveBufferSize the largest MessageChunk that the sender (Client) can receive. This value shall be
* greater than 8192 bytes.
* @param sendBufferSize the largest MessageChunk that the sender (Client) will send. This value shall be
* greater
* than 8192 bytes.
* @param maxMessageSize the maximum size for any response Message. The Message size is calculated using the
* unencrypted Message body. A value of zero indicates that the Client has no limit.
* @param maxChunkCount the maximum number of chunks in any response Message. A value of zero indicates that
* the Client has no limit.
* @param endpointUrl the URL of the Endpoint which the Client wished to connect to. The encoded value shall
* be less than 4096 bytes.
*/
public HelloMessage(@UInt32Primitive long protocolVersion,
@UInt32Primitive long receiveBufferSize,
@UInt32Primitive long sendBufferSize,
@UInt32Primitive long maxMessageSize,
@UInt32Primitive long maxChunkCount,
@Nonnull String endpointUrl) {
checkArgument(receiveBufferSize >= 8192, "receiverBufferSize must be at least 8192 bytes");
checkArgument(sendBufferSize >= 8192, "sendBufferSize must be at least 8192 bytes");
checkArgument(endpointUrl.length() <= 4096, "endpointUrl length cannot be greater than 4096 bytes");
this.protocolVersion = protocolVersion;
this.receiveBufferSize = receiveBufferSize;
this.sendBufferSize = sendBufferSize;
this.maxMessageSize = maxMessageSize;
this.maxChunkCount = maxChunkCount;
this.endpointUrl = endpointUrl;
}
@UInt32Primitive
public long getProtocolVersion() {
return protocolVersion;
}
@UInt32Primitive
public long getReceiveBufferSize() {
return receiveBufferSize;
}
@UInt32Primitive
public long getSendBufferSize() {
return sendBufferSize;
}
@UInt32Primitive
public long getMaxMessageSize() {
return maxMessageSize;
}
@UInt32Primitive
public long getMaxChunkCount() {
return maxChunkCount;
}
public String getEndpointUrl() {
return endpointUrl;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
HelloMessage that = (HelloMessage) o;
return maxChunkCount == that.maxChunkCount &&
maxMessageSize == that.maxMessageSize &&
protocolVersion == that.protocolVersion &&
receiveBufferSize == that.receiveBufferSize &&
sendBufferSize == that.sendBufferSize &&
endpointUrl.equals(that.endpointUrl);
}
@Override
public int hashCode() {
int result = (int) (protocolVersion ^ (protocolVersion >>> 32));
result = 31 * result + (int) (receiveBufferSize ^ (receiveBufferSize >>> 32));
result = 31 * result + (int) (sendBufferSize ^ (sendBufferSize >>> 32));
result = 31 * result + (int) (maxMessageSize ^ (maxMessageSize >>> 32));
result = 31 * result + (int) (maxChunkCount ^ (maxChunkCount >>> 32));
result = 31 * result + endpointUrl.hashCode();
return result;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this)
.add("protocolVersion", protocolVersion)
.add("receiverBufferSize", receiveBufferSize)
.add("sendBufferSize", sendBufferSize)
.add("maxMessageSize", maxMessageSize)
.add("maxChunkCount", maxChunkCount)
.add("endpointUrl", endpointUrl)
.toString();
}
public static void encode(HelloMessage message, ByteBuf buffer) {
buffer.writeInt((int) message.getProtocolVersion());
buffer.writeInt((int) message.getReceiveBufferSize());
buffer.writeInt((int) message.getSendBufferSize());
buffer.writeInt((int) message.getMaxMessageSize());
buffer.writeInt((int) message.getMaxChunkCount());
encodeString(message.getEndpointUrl(), buffer);
}
public static HelloMessage decode(ByteBuf buffer) {
return new HelloMessage(
buffer.readUnsignedInt(), /* ProtocolVersion */
buffer.readUnsignedInt(), /* ReceiveBufferSize */
buffer.readUnsignedInt(), /* SendBufferSize */
buffer.readUnsignedInt(), /* MaxMessageSize */
buffer.readUnsignedInt(), /* MaxChunkCount */
decodeString(buffer) /* EndpointUrl */
);
}
private static void encodeString(String s, ByteBuf buffer) {
new BinaryEncoder().setBuffer(buffer).encodeString(null, s);
}
private static String decodeString(ByteBuf buffer) {
return new BinaryDecoder().setBuffer(buffer).decodeString(null);
}
}