将过程对象存储在数据库中

Question

I am doing

Process p = null;
        if(CheckOS.isWindows())
            p = rt.exec(filebase+port+"/hlds.exe +maxplayers "+players+ " -game cstrike -console +port "+port+" -nojoy -noipx -heapsize 250000 +map de_dust2 +servercfgfile server.cfg +lservercfgfile +mapcyclefile mapcycle.txt +motdfile motd.txt +logsdir logs -zone 2048",null,  new File(filebase+port)) ;

and want to store p in database but process is not serializable, how to save it in database??

and can we check if process p is still running or died due to some crash or something

Answer 1

You definitely cannot store a Process itself in a database. But if you are trying to keep processes around for future use (within the scope of the VM), then you can have something like this:

public class ProcessRegistry {

  public static class Key {}

  private static final ProcessRegistry INSTANCE = new ProcessRegistry();

  public static ProcessRegistry getInstance() { return INSTANCE; }

  private final Map<Object, Process> _processes = new HashMap<...>();

  public Key registry(Process p) {
    Key key = new Object();
    _processes.put(key, p);
    return key;
  }

  public Process lookup(Key key) {
    return _processes.get(key);
  }
}

You can store and lookup from wherever (within the confines of your classloader) using

ProcessRegistry.getInstance().register(...)

etc.

Answer 2

There is no easy way to save a process to a database. Instead you can save a reference to it in the database. If I was doing it I would do:

1. Create a new process
2. Save the process to a map with some id
3. Save that id to database

When looking it up you can look up the process with an id to see if it has ended.