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/*
* MIT License
*
* Copyright (c) 2021-2099 Oscura (xingshuang)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.github.xingshuangs.iot.net.client;
import com.github.xingshuangs.iot.exceptions.SocketRuntimeException;
import com.github.xingshuangs.iot.net.ICommunicable;
import java.io.IOException;
import java.net.*;
import static com.github.xingshuangs.iot.common.constant.GeneralConst.LOCALHOST;
/**
* UDP client basic class.
*
* @author xingshuang
*/
public class UdpClientBasic implements ICommunicable {
/**
* Server address.
* (服务端地址)
*/
protected InetSocketAddress serverAddress;
/**
* UDP socket object.
* (socket对象)
*/
protected DatagramSocket socket;
/**
* Get local port number
* (获取本地端口号)
*
* @return local port number
*/
public int getLocalPort() {
DatagramSocket availableSocket = this.getAvailableSocket();
return availableSocket.getLocalPort();
}
public UdpClientBasic() {
this(LOCALHOST, 8088);
}
/**
* Construction.
*
* @param ip server ip address
* @param port Server port number
*/
public UdpClientBasic(String ip, int port) {
this.serverAddress = new InetSocketAddress(ip, port);
}
public void close() {
if (this.socket != null && !this.socket.isClosed()) {
this.socket.close();
}
}
/**
* Bind server.
* (绑定服务器)
*
* @param ip IP address
* @param port port number
*/
public void bindServer(String ip, int port) {
this.serverAddress = new InetSocketAddress(ip, port);
}
/**
* Get connected socket.
* (获取连接socket)
*
* @return socket
* @throws SocketRuntimeException Socket Runtime Exception
*/
public DatagramSocket getAvailableSocket() {
// 已连接的直接返回socket
if (this.socket != null) {
return this.socket;
}
try {
// 重新创建对象，并连接
this.socket = new DatagramSocket();
// connect之后通信地址必须是这个地址
// this.socket.connect(this.serverAddress);
return socket;
} catch (IOException e) {
throw new SocketRuntimeException(e);
}
}
/**
* Write data by byte array.
* (写入数据)
*
* @param data byte array
* @throws SocketRuntimeException Socket Runtime Exception
*/
public void write(final byte[] data) {
this.write(data, 0, data.length, this.serverAddress);
}
/**
* Write data by byte array.
* (写入数据)
*
* @param data byte array
* @param offset the start offset in the data.
* @param length the number of bytes to write.
* @throws SocketRuntimeException Socket Runtime Exception
*/
public void write(final byte[] data, final int offset, final int length) {
this.write(data, offset, length, this.serverAddress);
}
/**
* Write data by byte array.
* (写入数据)
*
* @param data byte array
* @param offset the start offset in the data.
* @param length the number of bytes to write.
* @param address socket address.
* @throws SocketRuntimeException Socket Runtime Exception
*/
public void write(final byte[] data, final int offset, final int length, SocketAddress address) {
DatagramPacket packet = new DatagramPacket(data, offset, length, address);
this.write(packet);
}
/**
* Write data by datagram packet.
* (写入数据)
*
* @param packet DatagramPacket object
* @throws SocketRuntimeException Socket Runtime Exception
*/
public void write(DatagramPacket packet) {
try {
DatagramSocket availableSocket = this.getAvailableSocket();
availableSocket.send(packet);
} catch (IOException e) {
throw new SocketRuntimeException(e);
}
}
/**
* Read data and store it in the position of the specified byte array.
* (读取数据)
*
* @return byte array
* @throws SocketRuntimeException Socket Runtime Exception
*/
public byte[] read() {
byte[] buffer = new byte[4096];
int length = this.read(buffer);
if (length < 4096) {
byte[] data = new byte[length];
System.arraycopy(buffer, 0, data, 0, length);
return data;
} else {
return buffer;
}
}
/**
* Read data and store it in the position of the specified byte array.
* (读取数据)
*
* @param data byte array
* @return the total number of bytes read into the data
* @throws SocketRuntimeException Socket Runtime Exception
*/
public int read(final byte[] data) {
return this.read(data, 0, data.length);
}
/**
* Read data and store it in the position of the specified byte array.
* (读取数据)
*
* @param data byte array
* @param timeout timeout in millisecond，0：blocked，big than 0：timeout time.
* @return the total number of bytes read into the data
* @throws SocketRuntimeException Socket Runtime Exception
*/
public int read(final byte[] data, final int timeout) {
return this.read(data, 0, data.length, timeout);
}
/**
* Read data and store it in the position of the specified byte array.
* (读取数据)
*
* @param data byte array
* @param offset the start offset in the data.
* @param length the number of bytes to read.
* @return the total number of bytes read into the data
* @throws SocketRuntimeException Socket Runtime Exception
*/
public int read(final byte[] data, final int offset, final int length) {
return this.read(data, offset, length, this.serverAddress, 0);
}
/**
* Read data and store it in the position of the specified byte array.
* (读取数据)
*
* @param data byte array
* @param offset the start offset in the data.
* @param length the number of bytes to read.
* @param timeout timeout in millisecond，0：blocked，big than 0：timeout time.
* @return the total number of bytes read into the data
* @throws SocketRuntimeException Socket Runtime Exception
*/
public int read(final byte[] data, final int offset, final int length, final int timeout) {
return this.read(data, offset, length, this.serverAddress, timeout);
}
/**
* Read data and store it in the position of the specified byte array.
* (读取数据)
*
* @param data byte array
* @param address socket address.
* @return the total number of bytes read into the data
* @throws SocketRuntimeException Socket Runtime Exception
*/
public int read(final byte[] data, final SocketAddress address) {
return this.read(data, 0, data.length, address, 0);
}
/**
* Read data and store it in the position of the specified byte array.
* (读取数据)
*
* @param data byte array
* @param address socket address.
* @param timeout timeout in millisecond，0：blocked，big than 0：timeout time.
* @return the total number of bytes read into the data
* @throws SocketRuntimeException Socket Runtime Exception
*/
public int read(final byte[] data, final SocketAddress address, final int timeout) {
return this.read(data, 0, data.length, address, timeout);
}
/**
* Read data and store it in the position of the specified byte array.
* (读取数据)
*
* @param data byte array
* @param offset the start offset in the data.
* @param length the number of bytes to read.
* @param address socket address.
* @param timeout timeout in millisecond，0：blocked，big than 0：timeout time.
* @return the total number of bytes read into the data
* @throws SocketRuntimeException Socket Runtime Exception
*/
public int read(final byte[] data, final int offset, final int length, final SocketAddress address, final int timeout) {
DatagramPacket packet = new DatagramPacket(data, offset, length, address);
DatagramPacket res = this.read(packet, timeout);
return res.getLength();
}
/**
* Read data into DatagramPacket object
* (读取数据)
*
* @param packet DatagramPacket object
* @return DatagramPacket object
* @throws SocketRuntimeException Socket Runtime Exception
*/
public DatagramPacket read(DatagramPacket packet) {
return this.read(packet, 0);
}
/**
* Read data into DatagramPacket object
* (读取数据)
*
* @param packet DatagramPacket object
* @param timeout timeout in millisecond，0：blocked，big than 0：timeout time.
* @return DatagramPacket object
* @throws SocketRuntimeException Socket Runtime Exception
*/
public DatagramPacket read(DatagramPacket packet, final int timeout) {
try {
DatagramSocket availableSocket = this.getAvailableSocket();
availableSocket.setSoTimeout(timeout);
availableSocket.receive(packet);
return packet;
} catch (IOException e) {
throw new SocketRuntimeException(e);
}
}
}
