package org.kuali.common.jute.runtime;
   
   import static org.kuali.common.jute.base.Precondition.checkMin;
   
   import java.lang.management.ManagementFactory;
   import java.lang.management.ThreadMXBean;
   
   import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
   
  @JsonDeserialize(builder = Threads.Builder.class)
  public final class Threads {
  
      private final int current;
      private final int daemon;
      private final int peak;
  
      private Threads(Builder builder) {
          this.current = builder.current;
          this.daemon = builder.daemon;
          this.peak = builder.peak;
      }
  
      public static Threads build() {
          ThreadMXBean bean = ManagementFactory.getThreadMXBean();
          Builder builder = builder();
          builder.withCurrent(bean.getThreadCount());
          builder.withDaemon(bean.getDaemonThreadCount());
          builder.withPeak(bean.getPeakThreadCount());
          return builder.build();
      }
  
      public static Builder builder() {
          return new Builder();
      }
  
      public static class Builder implements org.apache.commons.lang3.builder.Builder<Threads> {
  
          private int current;
          private int daemon;
          private int peak;
  
          public Builder withCurrent(int current) {
              this.current = current;
              return this;
          }
  
          public Builder withDaemon(int daemon) {
              this.daemon = daemon;
              return this;
          }
  
          public Builder withPeak(int peak) {
              this.peak = peak;
              return this;
          }
  
          @Override
          public Threads build() {
              return validate(new Threads(this));
          }
  
          private static Threads validate(Threads instance) {
              checkMin(instance.current, 0, "current");
              checkMin(instance.daemon, 0, "daemon");
              checkMin(instance.peak, 0, "peak");
              return instance;
          }
      }
  
      public int getCurrent() {
          return current;
      }
  
      public int getDaemon() {
          return daemon;
      }
  
      public int getPeak() {
          return peak;
      }
  
  }