gerrit.simantics Code Review - simantics/platform.git/blob

   1 package org.simantics.modeling;
   2
   3 import java.util.ArrayList;
   4
   5 import org.simantics.db.ReadGraph;
   6 import org.simantics.db.common.request.ParametrizedPrimitiveRead;
   7 import org.simantics.db.procedure.Listener;
   8 import org.simantics.scl.compiler.environment.specification.EnvironmentSpecification;
   9 import org.simantics.scl.compiler.module.repository.ImportFailureException;
  10 import org.simantics.scl.compiler.module.repository.UpdateListener;
  11 import org.simantics.scl.compiler.runtime.RuntimeEnvironment;
  12 import org.simantics.scl.osgi.SCLOsgi;
  13 import org.simantics.scl.runtime.SCLContext;
  14
  15 public class ComponentTypeScriptRuntimeEnvironmentRequest extends ParametrizedPrimitiveRead<EnvironmentSpecification, RuntimeEnvironment> {
  16
  17     // This array list is only needed to keep strong references to update listeners preventing their garbage collection.
  18     ArrayList<UpdateListener> listeners;
  19
  20     public ComponentTypeScriptRuntimeEnvironmentRequest(EnvironmentSpecification parameter) {
  21         super(parameter);
  22     }
  23
  24     @Override
  25     public void register(ReadGraph graph, Listener<RuntimeEnvironment> procedure) {
  26         UpdateListener listener = null;
  27         if(!procedure.isDisposed()) {
  28             listener = new UpdateListener() {
  29                 @Override
  30                 public void notifyAboutUpdate() {
  31                     createRuntimeEnvironment(graph, procedure, this);
  32                 }
  33             };
  34             if(listeners == null)
  35                 listeners = new ArrayList<UpdateListener>(2);
  36             listeners.add(listener);
  37         }
  38         createRuntimeEnvironment(graph, procedure, listener);
  39     }
  40
  41     private void createRuntimeEnvironment(ReadGraph graph, Listener<RuntimeEnvironment> procedure, UpdateListener listener) {
  42         SCLContext context = SCLContext.getCurrent();
  43         Object oldGraph = context.put("graph", graph);
  44         try {
  45             procedure.execute(SCLOsgi.MODULE_REPOSITORY.createRuntimeEnvironment(parameter, ComponentTypeScriptRuntimeEnvironmentRequest.class.getClassLoader(), listener));
  46         }
  47         catch (ImportFailureException e) {
  48             procedure.exception(e);
  49         }
  50         finally {
  51             context.put("graph", oldGraph);
  52         }
  53     }
  54
  55 }