[英]How to wait until java compilation of PlantUML diagrams is completed, in Python?
[英]Java how to wait until a command has completed?
我有以下腳本:
Connection con = new Connection("host",80);
ByteBuffer loginbb = ByteBuffer.allocate(300);
<snip>
loginbb.flip();
byte[]login = new byte[loginbb.remaining()];
loginbb.get(login);
ByteBuffer headerbb = ByteBuffer.allocate(7);
<snip>
headerbb.flip();
byte[]header = new byte[headerbb.remaining()];
headerbb.get(header);
con.run(login, header);
try {
Thread.sleep(1000);
} catch(InterruptedException ex) {
Thread.currentThread().interrupt();
}
long pid = Long.parseLong(request.getParameter("player"));
PrintWriter out = response.getWriter();
ByteBuffer bb = ByteBuffer.allocate(100);
bb.putLong(pid);
bb.putLong(pid);
bb.put((byte) 0x00);
bb.flip();
byte[] payload = new byte[bb.remaining()];
bb.get(payload);
ByteBuffer headerbb2 = ByteBuffer.allocate(7);
<snip>
headerbb2.flip();
byte[]header2 = new byte[headerbb2.remaining()];
headerbb2.get(header2);
con.send(payload, header2);
try {
Thread.sleep(700);
} catch(InterruptedException ex) {
Thread.currentThread().interrupt();
}
Gson gson = new GsonBuilder().setPrettyPrinting().create();
JsonParser jp = new JsonParser();
JsonElement je = jp.parse(Avatar.getJson().toString());
String json = gson.toJson(je);
out.flush();
out.println(json);
out.flush();
請注意以下內容?
try {
Thread.sleep(700);
} catch(InterruptedException ex) {
Thread.currentThread().interrupt();
}
和這個:
try {
Thread.sleep(1000);
} catch(InterruptedException ex) {
Thread.currentThread().interrupt();
}
所以這會暫停我的腳本一段時間,但是我不希望這樣,因為腳本可能會花費更長或更短的時間。 那會浪費一些時間D:
我想發生的是,它只是等待內容完成。
con.run基本上會執行初始任務,然后進行協商。
con.send基本上運行以下命令:
private void sendToServer(byte[] message, int length, byte[]header) {
byte[]payload = outrc4.encrypt(message,false);
byte[] data = new byte[header.length+payload.length];
System.arraycopy(header,0,data,0,header.length);
System.arraycopy(payload,0,data,header.length,payload.length);
try {
out.write(data);
} catch (IOException e) {
System.out.println("Error!");
}
}
它只是將數據包發送到服務器。
從這里,在con.run上,我得到了多個數據包。 我可以捕獲數據包的ID,並在接收和解析數據包的循環中添加一個if語句,該語句檢查是否已收到loginDone數據包。
void receive() {
try {
while (in.available() > -1) {
int type = in.readUnsignedShort();
int size = in.readUnsignedByte();
size <<= 8;
size |= in.readUnsignedByte();
size <<= 8;
size |= in.readUnsignedByte();
int version = in.readUnsignedShort();
byte array[] = new byte[7];
array[0] = (byte)((type >>> 8) & 0xFF);
array[1] = (byte)(type & 0xFF);
array[2] = (byte)((size >>> 16) & 0xFF);
array[3] = (byte)((size >>> 8) & 0xFF);
array[4] = (byte)(size & 0xFF);
array[5] = (byte)((version >>> 8) & 0xFF);
array[6] = (byte)(version & 0xFF);
final byte[] reply = new byte[size];
in.readFully(reply,0,size);
byte[] data = new byte[array.length + reply.length];
System.arraycopy(array, 0, data, 0, array.length);
System.arraycopy(reply, 0, data, array.length, reply.length);
byte[] decryptedPayload = inrc4.encrypt(reply,false);
if(type == 20000){
updateKeys(decryptedPayload);
}
if(type == 24411){
//this one means that the 1st packet that uses con.run is done
System.out.println("Logged In!");
}
if(type == 24334){
//this one means that the 2nd packet that uses con.send is done
InputStream myis = new ByteArrayInputStream(decryptedPayload);
new Avatar(myis);
t.interrupt();
}
}
} catch (Exception e) {}
}
不接受這些注釋://這表示使用con.send的第二個數據包已完成,//這表示使用con.run的第一個數據包已完成
據我所知。 有誰知道我應該從這里做什么?
如果您的服務器和客戶端在同一個Java進程中,請使用CountDownLatch或thread.join() 。 如果它們是不同的機器,請閱讀EDIT部分。
class Foo extends Thread {
CountDownLatch latch;
public Foo(CountDownLatch latch) {
this.latch = latch;
}
@Override
public synchronized void start() {
try {
sleep(1000);
latch.countDown(); // in every call latch decrease one, when it reach to zero, every thread that is waiting the latch will continue.
sleep(100);
} catch (InterruptedException e) {
}
}
}
class FooBar {
public static void main(String[] args) throws InterruptedException {
CountDownLatch latch = new CountDownLatch(1);
new Foo(latch).start();
latch.await(); // wait latch reach to zero. BE CAREFUL, IT'S NOT WAIT(),
// IT'S AWAIT()
System.out.println("done");
}
}
編輯為了簡單起見,我將保留上面的代碼。 我認為這很不言自明,可以幫助其他人。
好的,如果您要等到receive()
方法完全完成,則需要開發一種方法,使服務器可以對客戶端說該方法已完成,或者可以開發一種方法,使您的客戶端不斷檢查客戶端中的某些狀態。服務器,例如isTaskCompleted()
。 我不知道您的情況如何使服務器向客戶端發送數據包。 我將基本上描述兩種解決這種情況的方法,我將使用其他名稱的類和變量,因此請嘗試適應您的代碼。
public class WaitServer extends Thread {
synchronized void serverCompleted() {
// when server completes
notify();
}
@Override
public synchronized void start() {
try {
wait(); // waits the server
} catch (InterruptedException e) {
}
}
}
class ClientSide {
void doSomething() {
// ... some stuff ....
sendToServer();
new WaitServer().join();
// continues execution
}
}
class ServerSide {
void received() {
// ... do some stuff .....
if (someStuff) {
sendSignalToClient();
}
// .. others stuff
}
void sendSignalToClient() {
// here of course you need to send in the way that you are sending today, this is "pseudocode"
client.serverCompleted()
}
}
另一種方法是讓您的客戶端檢查服務器,直到任務完成為止,只需創建一個線程即可發送作業驗證,如果一段時間未完成睡眠。 當您想讓一個線程等待另一個時,請使用join()
。 如果希望線程在另一個內部等待處理的某些部分,請使用CountDownLatch
。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.