wamblee.org Git - utils/blob - system/general/src/main/java/org/wamblee/system/CompositeSystem.java

   1 package org.wamblee.system;
   2
   3 import java.util.ArrayList;
   4 import java.util.Arrays;
   5 import java.util.List;
   6
   7 import org.apache.commons.logging.Log;
   8 import org.apache.commons.logging.LogFactory;
   9
  10 import sun.util.LocaleServiceProviderPool.LocalizedObjectGetter;
  11
  12 /**
  13  * Composite system consisting of multiple subsystems.
  14  */
  15 public class CompositeSystem extends AbstractSubSystem {
  16
  17         private static final Log LOG = LogFactory.getLog(CompositeSystem.class);
  18
  19         private SubSystem[] _systems;
  20
  21         /**
  22          * Construcst the composite system.
  23          * @param aName Name of the system.
  24          * @param aSystems Subsystems.
  25          * @param aProvided Provided services of the system.
  26          * @param aRequired Required services by the system.
  27          */
  28         public CompositeSystem(String aName, SubSystem[] aSystems,
  29                         ServiceDescriptor[] aProvided, ServiceDescriptor[] aRequired) {
  30                 super(aName, aProvided, aRequired);
  31                 _systems = aSystems;
  32                 validate();
  33         }
  34
  35         /**
  36          * Validates the subsystems together to check that there are
  37          * no required services not in the required list and
  38          * no services in the provided list that cannot be provided.
  39          * Also logs a warning in case of superfluous requirements.
  40          */
  41         private void validate() {
  42                 List<ServiceDescriptor> provided = new ArrayList<ServiceDescriptor>();
  43                 for (SubSystem system : _systems) {
  44                         provided.addAll(Arrays.asList(system.getProvidedServices()));
  45                 }
  46
  47                 List<ServiceDescriptor> required = new ArrayList<ServiceDescriptor>();
  48                 for (SubSystem system : _systems) {
  49                         required.addAll(Arrays.asList(system.getRequiredServices()));
  50                 }
  51
  52                 for (ServiceDescriptor service : getProvidedServices()) {
  53                         if (!(provided.contains(service))) {
  54                                 throw new SystemAssemblyException(getName() + ": Service '" + service
  55                                                 + "' is not provided by any of the subsystems");
  56                         }
  57                 }
  58
  59                 for (ServiceDescriptor service : getRequiredServices()) {
  60                         if (!(required.contains(service))) {
  61                                 info("Service '"
  62                                                 + service
  63                                                 + "' indicated as required is not actually required by any of the subsystems");
  64                         }
  65                 }
  66
  67                 List<ServiceDescriptor> reallyRequired = new ArrayList<ServiceDescriptor>(
  68                                 required);
  69                 for (ServiceDescriptor service : provided) {
  70                         reallyRequired.remove(service);
  71                 }
  72                 for (ServiceDescriptor service: getRequiredServices()) {
  73                         reallyRequired.remove(service);
  74                 }
  75                 for (ServiceDescriptor service: reallyRequired) {
  76                         throw new SystemAssemblyException(getName() + ": " + "Service '" + service + "' is not provided internally and is not indicated as required for this sub system");
  77                 }
  78         }
  79
  80         @Override
  81         protected void doInitialize(String aContext, Service[] aRequiredServices) {
  82                 List<ServiceDescriptor> descriptors = new ArrayList<ServiceDescriptor>();
  83                 for (Service service : aRequiredServices) {
  84                         descriptors.add(service.getDescriptor());
  85                 }
  86                 SystemAssembler assembler = new SystemAssembler(getName(), _systems,
  87                                 descriptors.toArray(new ServiceDescriptor[0]));
  88                 assembler.start(aRequiredServices);
  89         }
  90
  91         private void info(String aMsg) {
  92                 LOG.info(getName() + ": " + aMsg);
  93         }
  94
  95 }