package org.kuali.common.jute.runtime;
   
   import static com.google.common.base.Optional.absent;
   import static com.google.common.collect.Iterables.getFirst;
   import static java.lang.Integer.parseInt;
   import static org.apache.commons.lang3.StringUtils.trimToNull;
   
   import java.lang.management.ManagementFactory;
   
  import javax.inject.Provider;
  
  import com.google.common.base.Optional;
  import com.google.common.base.Splitter;
  
  public enum ProcessIdProvider implements Provider<Optional<Integer>> {
      INSTANCE;
  
      @Override
      public Optional<Integer> get() {
          try {
              // From the Javadoc -> "The returned name string can be any arbitrary string"
              // In practice, the name is *usually* the pid followed by the @ character, but there are no guarantees
              String name = ManagementFactory.getRuntimeMXBean().getName();
              Iterable<String> tokens = Splitter.on('@').split(name);
              String first = getFirst(tokens, null);
              String trimmed = trimToNull(first);
              if (trimmed == null) {
                  return absent();
              } else {
                  int pid = parseInt(trimmed);
                  return Optional.of(pid);
              }
          } catch (Throwable e) {
              // If anything goes wrong at any point, just return absent()
              return absent();
          }
      }
  
  }