Java check a specific condition after a thread terminates

I have the following code

    PlayerMove move;

    Thread t = new Thread(new Timer());

    t.start();

    move = this.currentPlayer.GetPlayerMove();

how I can check if the move variable is null after the thread t terminates?

asked Nov 20 '18 at 10:50

E.Omar

1

It is unclear what you are asking for. Do you want to know how to check if the thread ended? Do you want to know how to write a loop and wait for that method to return a null result?

– GhostCat
Nov 20 '18 at 10:53

if currentPlayer.GetPlayerMove() doesn't return null until after the thread ended then move might never be null unless the thread executes so fast that it will end right before GetPlayerMove() is called. Besides that, you'd need to know when the thread has finished and there are a number of ways to do that (e.g. use a Future, join the threads etc.) - what exactly are you trying to achieve?

– Thomas
Nov 20 '18 at 10:53

@GhostCat I want to know if the move var is null or not after the timer thread ends.

– E.Omar
Nov 20 '18 at 10:57

Are you maybe trying to give the player the opportunity to move for a given time?

– daniu
Nov 20 '18 at 11:00

@Thomas Thanks for your response . What i want to achieve is giving a player a limited time to make a move and if he/she doesn't i wanna stop the game.

– E.Omar
Nov 20 '18 at 11:03

add a comment |

I have the following code

    PlayerMove move;

    Thread t = new Thread(new Timer());

    t.start();

    move = this.currentPlayer.GetPlayerMove();

how I can check if the move variable is null after the thread t terminates?

asked Nov 20 '18 at 10:50

E.Omar

1

It is unclear what you are asking for. Do you want to know how to check if the thread ended? Do you want to know how to write a loop and wait for that method to return a null result?

– GhostCat
Nov 20 '18 at 10:53

if currentPlayer.GetPlayerMove() doesn't return null until after the thread ended then move might never be null unless the thread executes so fast that it will end right before GetPlayerMove() is called. Besides that, you'd need to know when the thread has finished and there are a number of ways to do that (e.g. use a Future, join the threads etc.) - what exactly are you trying to achieve?

– Thomas
Nov 20 '18 at 10:53

@GhostCat I want to know if the move var is null or not after the timer thread ends.

– E.Omar
Nov 20 '18 at 10:57

Are you maybe trying to give the player the opportunity to move for a given time?

– daniu
Nov 20 '18 at 11:00

@Thomas Thanks for your response . What i want to achieve is giving a player a limited time to make a move and if he/she doesn't i wanna stop the game.

– E.Omar
Nov 20 '18 at 11:03

add a comment |

I have the following code

    PlayerMove move;

    Thread t = new Thread(new Timer());

    t.start();

    move = this.currentPlayer.GetPlayerMove();

how I can check if the move variable is null after the thread t terminates?

asked Nov 20 '18 at 10:50

E.Omar

I have the following code

    PlayerMove move;

    Thread t = new Thread(new Timer());

    t.start();

    move = this.currentPlayer.GetPlayerMove();

how I can check if the move variable is null after the thread t terminates?

java multithreading

asked Nov 20 '18 at 10:50

E.Omar

asked Nov 20 '18 at 10:50

E.Omar

asked Nov 20 '18 at 10:50

E.Omar

asked Nov 20 '18 at 10:50

E.Omar

asked Nov 20 '18 at 10:50

E.Omar

1

It is unclear what you are asking for. Do you want to know how to check if the thread ended? Do you want to know how to write a loop and wait for that method to return a null result?

– GhostCat
Nov 20 '18 at 10:53

if currentPlayer.GetPlayerMove() doesn't return null until after the thread ended then move might never be null unless the thread executes so fast that it will end right before GetPlayerMove() is called. Besides that, you'd need to know when the thread has finished and there are a number of ways to do that (e.g. use a Future, join the threads etc.) - what exactly are you trying to achieve?

– Thomas
Nov 20 '18 at 10:53

@GhostCat I want to know if the move var is null or not after the timer thread ends.

– E.Omar
Nov 20 '18 at 10:57

Are you maybe trying to give the player the opportunity to move for a given time?

– daniu
Nov 20 '18 at 11:00

@Thomas Thanks for your response . What i want to achieve is giving a player a limited time to make a move and if he/she doesn't i wanna stop the game.

– E.Omar
Nov 20 '18 at 11:03

add a comment |

1

It is unclear what you are asking for. Do you want to know how to check if the thread ended? Do you want to know how to write a loop and wait for that method to return a null result?

– GhostCat
Nov 20 '18 at 10:53

if currentPlayer.GetPlayerMove() doesn't return null until after the thread ended then move might never be null unless the thread executes so fast that it will end right before GetPlayerMove() is called. Besides that, you'd need to know when the thread has finished and there are a number of ways to do that (e.g. use a Future, join the threads etc.) - what exactly are you trying to achieve?

– Thomas
Nov 20 '18 at 10:53

@GhostCat I want to know if the move var is null or not after the timer thread ends.

– E.Omar
Nov 20 '18 at 10:57

Are you maybe trying to give the player the opportunity to move for a given time?

– daniu
Nov 20 '18 at 11:00

@Thomas Thanks for your response . What i want to achieve is giving a player a limited time to make a move and if he/she doesn't i wanna stop the game.

– E.Omar
Nov 20 '18 at 11:03

It is unclear what you are asking for. Do you want to know how to check if the thread ended? Do you want to know how to write a loop and wait for that method to return a null result?

– GhostCat
Nov 20 '18 at 10:53

if currentPlayer.GetPlayerMove() doesn't return null until after the thread ended then move might never be null unless the thread executes so fast that it will end right before GetPlayerMove() is called. Besides that, you'd need to know when the thread has finished and there are a number of ways to do that (e.g. use a Future, join the threads etc.) - what exactly are you trying to achieve?

– Thomas
Nov 20 '18 at 10:53

@GhostCat I want to know if the move var is null or not after the timer thread ends.

– E.Omar
Nov 20 '18 at 10:57

Are you maybe trying to give the player the opportunity to move for a given time?

– daniu
Nov 20 '18 at 11:00

@Thomas Thanks for your response . What i want to achieve is giving a player a limited time to make a move and if he/she doesn't i wanna stop the game.

– E.Omar
Nov 20 '18 at 11:03

add a comment |

1 Answer
1

active

oldest

votes

My guess is what you want is something like this:

CompletableFuture<PlayerMove> moveFuture = supplyAsync(currentPlayer::getPlayerMove);



try {

    PlayerMove move = moveFuture.get(limit, TimeUnit.MILLISECONDS);

    // player moved

} catch (TimeoutException e) {

    // player did not move

}

CompletableFuture is an interface representing a result that gets calculated in a separate thread (in this case, a call to currentPlayer.getPlayerMove()). You can retrieve the result by calling get() which will wait forever or (as in this case), for a specified period of time. If that timeout has elapsed, a TimeoutException is thrown.

edited Nov 20 '18 at 11:47

answered Nov 20 '18 at 11:03

daniu

7,45021635

Can you explain this solution please?

– E.Omar
Nov 20 '18 at 11:20

@E.Omar Added an explanation to the answer.

– daniu
Nov 20 '18 at 11:47

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

My guess is what you want is something like this:

CompletableFuture<PlayerMove> moveFuture = supplyAsync(currentPlayer::getPlayerMove);



try {

    PlayerMove move = moveFuture.get(limit, TimeUnit.MILLISECONDS);

    // player moved

} catch (TimeoutException e) {

    // player did not move

}

edited Nov 20 '18 at 11:47

answered Nov 20 '18 at 11:03

daniu

7,45021635

Can you explain this solution please?

– E.Omar
Nov 20 '18 at 11:20

@E.Omar Added an explanation to the answer.

– daniu
Nov 20 '18 at 11:47

add a comment |

My guess is what you want is something like this:

CompletableFuture<PlayerMove> moveFuture = supplyAsync(currentPlayer::getPlayerMove);



try {

    PlayerMove move = moveFuture.get(limit, TimeUnit.MILLISECONDS);

    // player moved

} catch (TimeoutException e) {

    // player did not move

}

edited Nov 20 '18 at 11:47

answered Nov 20 '18 at 11:03

daniu

7,45021635

Can you explain this solution please?

– E.Omar
Nov 20 '18 at 11:20

@E.Omar Added an explanation to the answer.

– daniu
Nov 20 '18 at 11:47

add a comment |

My guess is what you want is something like this:

CompletableFuture<PlayerMove> moveFuture = supplyAsync(currentPlayer::getPlayerMove);



try {

    PlayerMove move = moveFuture.get(limit, TimeUnit.MILLISECONDS);

    // player moved

} catch (TimeoutException e) {

    // player did not move

}

edited Nov 20 '18 at 11:47

answered Nov 20 '18 at 11:03

daniu

7,45021635

My guess is what you want is something like this:

CompletableFuture<PlayerMove> moveFuture = supplyAsync(currentPlayer::getPlayerMove);



try {

    PlayerMove move = moveFuture.get(limit, TimeUnit.MILLISECONDS);

    // player moved

} catch (TimeoutException e) {

    // player did not move

}

edited Nov 20 '18 at 11:47

answered Nov 20 '18 at 11:03

daniu

7,45021635

edited Nov 20 '18 at 11:47

answered Nov 20 '18 at 11:03

daniu

7,45021635

answered Nov 20 '18 at 11:03

daniu

7,45021635

answered Nov 20 '18 at 11:03

daniu

7,45021635

Can you explain this solution please?

– E.Omar
Nov 20 '18 at 11:20

@E.Omar Added an explanation to the answer.

– daniu
Nov 20 '18 at 11:47

add a comment |

Can you explain this solution please?

– E.Omar
Nov 20 '18 at 11:20

@E.Omar Added an explanation to the answer.

– daniu
Nov 20 '18 at 11:47

Can you explain this solution please?

– E.Omar
Nov 20 '18 at 11:20

@E.Omar Added an explanation to the answer.

– daniu
Nov 20 '18 at 11:47

add a comment |

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