Examples of ec.util.Output

ec.util.Output
Outputs and logs system messages, errors, and other various items printed as a result of a run.
Output maintains zero or more logs, which contain Writers which write out stuff. Each log has an associated verbosity; if request is made to write text to a log, and the text's maximal verbosity is lower than the verbosity of the log, the log will not write it. Each Output instance also has an instance-level global verbosity; incoming requests to write text are additionally subject to this verbosity test. Lastly, the Output class itself has a global verbosity as well. This last verbosity is useful for shutting down writing to all logs in the entire system in a simple way.
When the system fails for some reason and must be started back up from a checkpoint, Output's log files may be overwritten. Output offers three approaches here. First, Output can clear the log file and overwrite it. Second, Output can append to the existing log file; because checkpoints are only done occasionally, this may result in duplicate outputs to a file, so keep this in mind. Third, Output can keep certain written text, typically announcements, in memory; this text gets written out into the checkpoint file, and so it is sound.
There are several kinds of announcements, in different levels of importance.
1. FATAL ERRORs. These errors cause the system to exit(1) immediately.
2. Simple ERRORs. These errors set the "errors" flag to true; at the end of a stream of simple errors, the system in general is expected to exit with a fatal error due to the flag being set. That's the protocol anyway. On restart from a checkpoint, if there were any simple errors, the system ends with a fatal error automatically.
3. WARNINGs. These errors do not cause the system to exit under any circumstances.
4. MESSAGEs. Useful facts printed out for the benefit of the user.
5. SYSTEM MESSAGEs. Useful system-level facts printed out for the benefit of the user.
Output will also store all announcements in memory by default so as to reproduce them if it's restarted from a checkpoint. You can change this behavior also by @author Sean Luke @version 1.0

             */
            void initializeEvolutionState()
                throws BadParameterException, ParamClassLoadException 
                {
                listeners.removeAllElements();
                Output output = initializeOutput();
                
                // 2. set up thread values
                /*
                  int breedthreads = parameters.getInt(
                  new Parameter(Evolve.P_BREEDTHREADS),null,1);
                  if (breedthreads < 1)
                  Output.initialError("Number of breeding threads should be an integer >0.",
                  new Parameter(Evolve.P_BREEDTHREADS));
                
                  int evalthreads = parameters.getInt(
                  new Parameter(Evolve.P_EVALTHREADS),null,1);
                  if (evalthreads < 1)
                  Output.initialError("Number of eval threads should be an integer >0.",
                  new Parameter(Evolve.P_EVALTHREADS));
                */
                
                int breedthreads = Evolve.determineThreads(output, parameters, new Parameter(Evolve.P_BREEDTHREADS));
                int evalthreads = Evolve.determineThreads(output, parameters, new Parameter(Evolve.P_EVALTHREADS));
                @SuppressWarnings("unused")
        boolean auto = (Evolve.V_THREADS_AUTO.equalsIgnoreCase(parameters.getString(new Parameter(Evolve.P_BREEDTHREADS),null)) ||
                    Evolve.V_THREADS_AUTO.equalsIgnoreCase(parameters.getString(new Parameter(Evolve.P_EVALTHREADS),null)));  // at least one thread is automatic.  Seeds may need to be dynamic.


                // 3. create the Mersenne Twister random number generators,
                // one per thread
                MersenneTwisterFast[] random = new MersenneTwisterFast[breedthreads > evalthreads ? 
                    breedthreads : evalthreads];
                int[] seeds = new int[breedthreads > evalthreads ? 
                    breedthreads : evalthreads];
                
                String seed_message = "Seed: ";
                for (int x=0;x<random.length;x++)
                    
                    {
                    seeds[x] = conPanel.getSeed(currentJob,x);
                    seed_message = seed_message + seeds[x] + " ";
                    }
                
                for (int x=0;x<random.length;x++)
                    
                    {
                    for (int y=x+1;y<random.length;y++)
                        if (seeds[x]==seeds[y])
                            
                            {
                            Output.initialError(Evolve.P_SEED+"."+x+" ("+seeds[x]+") and "+Evolve.P_SEED+"."+y+" ("+seeds[y]+") ought not be the same seed."); 
                            }
                    random[x] = Evolve.primeGenerator(new MersenneTwisterFast(seeds[x]));   // we prime the generator to be more sure of randomness.
                    }
                
                state = (EvolutionState)parameters.getInstanceForParameter(
                    new Parameter(Evolve.P_STATE),null,EvolutionState.class);
                
                state.parameters = parameters;
                state.random = random;
                state.output = output;
                String jobFilePrefix = Console.this.conPanel.getJobFilePrefix();
                if (Console.this.conPanel.getNumJobs() > 1) 
                    {
                    if (jobFilePrefix == null || jobFilePrefix.length()<1) 
                        {
                        jobFilePrefix = "job";
                        }
                    jobFilePrefix = jobFilePrefix+"."+Console.this.currentJob+".";
                    state.output.setFilePrefix(jobFilePrefix);
                    }
                
                state.evalthreads = evalthreads;
                state.breedthreads = breedthreads;
                
                output.systemMessage("Threads:  breed/" + breedthreads + " eval/" + evalthreads);
                output.systemMessage(seed_message);
                
                state.startFresh();


                if (Console.this.conPanel.getNumJobs() > 0) 
                    {

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        throws BadParameterException 
        {
        // 1. create the output
        //boolean store = parameters.getBoolean(new Parameter(Evolve.P_STORE),null,false);
        
        Output output = new Output(true);
        //output.setFlush(
        //    parameters.getBoolean(new Parameter(Evolve.P_FLUSH),null,false));
        
        
        // stdout is always log #0.  stderr is always log #1.
        // stderr accepts announcements, and both are fully verbose 
        // by default.
        output.addLog(ec.util.Log.D_STDOUT,false);
        output.addLog(ec.util.Log.D_STDERR,true);
        output.systemMessage(Version.message());
        return output;
        }

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