我已经开始研究预先开发的Java应用程序,他们正在处理Java套接字。该项目的主要概念是从客户端获取Java套接字服务器上的数据并对其进行处理。
该项目是使用Java NIO ServerSocketChannel开发的。
现在在这种情况下,我能够从客户端获得每秒70-80条记录。如果我使用简单的Java ServerSocket(仅用于测试目的),输出会缩放到大约800个代表。
为什么两者都有这么大的差异?如何修改ServerSocketChannel来模仿ServerSocket?
这是我的主要处理部分,
SocketChannel client = (SocketChannel) key.channel();
if (!key.isReadable()) {
key.cancel();
client.close();
continue;
}
int[] k = (int[]) key.attachment();
if (k[2] == 0) {
ByteBuffer lengthBuffer = ByteBuffer.allocate(2);
int bytesRead = -1;
if (!client.socket().isClosed() && key.isValid()) {
bytesRead = client.read(lengthBuffer);
}
if (bytesRead == -1) {
key.cancel();
client.close();
continue;
}
lengthBuffer.flip();
byte[] bytes = new byte[2];
lengthBuffer.get(bytes, 0, 2);
short length = DRMSDecoder.getShort(bytes);
k[0]++;
k[1] = length;
k[2] = 1;
key.attach(k);
lengthBuffer.clear();
}
else {
try {
int length = k[1];
ByteBuffer dataBuffer = ByteBuffer.allocate(length);
dataBuffer.clear();
System.gc();
int bytesRead = -1;
if (!client.socket().isClosed() && key.isValid()) {
bytesRead = client.read(dataBuffer);
}
if (bytesRead == -1) {
key.cancel();
client.close();
continue;
}
dataBuffer.flip();
Hashtable<String, Object> request = decoder.decode(dataBuffer);
short call_type = (Short) request.get("Call Type");
if (request.get("Call Type") != null && (((Short) request.get("Call Type")) == 78 || ((Short) request.get("Call Type")) == 80)) {
} else if (request.get("Call Type") != null && (((Short) request.get("Call Type")) == 79)) {
key.cancel();
client.close();
}
String message = (String) request.get("Buffer");
handleMessage(message);
}
k[0]++;
k[2] = 0;
key.attach(k);
lastMessageProcessed++;
dataBuffer.clear();
} catch (Exception e) {
// System.out.println(e); }}
不同之处在于阻止I / O与非阻塞I / O.
参考:https://medium.com/coderscorner/tale-of-client-server-and-socket-a6ef54a74763