For local processing, send out AMPL file

... only if connected to ActiveMQ, of course.

Change-Id: Id886f440f8fbe0dda1c620c5aabeeb82b17b5604

optimiser-controller/src/main/java/eu/nebulouscloud/optimiser/controller/LocalExecution.java

@@ -5,10 +5,12 @@ import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.concurrent.Callable;
+import java.util.concurrent.CountDownLatch;
 
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 
+import eu.nebulouscloud.exn.core.Publisher;
 import lombok.extern.slf4j.Slf4j;
 import picocli.CommandLine.Command;
 import picocli.CommandLine.Parameters;
@@ -31,17 +33,27 @@ public class LocalExecution implements Callable<Integer> {
 
     @Override public Integer call() {
         ObjectMapper mapper = new ObjectMapper();
+        CountDownLatch exn_synchronizer = new CountDownLatch(1);
+        ExnConnector connector = main.getActiveMQConnector();
+        Publisher publisher = null;
+        if (connector != null) {
+            publisher = connector.getAmplMessagePublisher();
+            connector.start(exn_synchronizer);
+        }
         JsonNode msg;
 	try {
 	    msg = mapper.readTree(Files.readString(app_creation_msg, StandardCharsets.UTF_8));
 	} catch (IOException e) {
             log.error("Could not read an input file: ", e);
             return 1;
-	}
-        NebulousApp app = NebulousApp.newFromAppMessage(msg,
-            main.getActiveMQConnector() == null ? null : main.getActiveMQConnector().getAmplMessagePublisher());
+        }
+        NebulousApp app = NebulousApp.newFromAppMessage(msg, publisher);
+        if (connector != null) {
+            log.info("Sending AMPL to channel {}", publisher);
+            app.sendAMPL();
+        }
         System.out.println(app.generateAMPL());
-
+        // TODO: wait for solver reply here?
         return 0;
     }
 }

optimiser-controller/src/main/java/eu/nebulouscloud/optimiser/controller/Main.java

@@ -112,7 +112,10 @@ public class Main implements Callable<Integer> {
     }
 
     /**
-     * Initialization code shared between main and subcommands.
+     * Initialization code shared between main and subcommands.  Note that
+     * here we connect to SAL if possible, but (for now) do not start the EXN
+     * ActiveMQ middleware. Each main method needs to call
+     * `activeMQConnector.start`.
      */
     private void init() {
         log.info("Beginning common startup of optimiser-controller");
@@ -123,7 +126,6 @@ public class Main implements Callable<Integer> {
                 log.error("Connection to SAL unsuccessful");
             } else {
                 log.info("Established connection to SAL");
-                // FIXME: remove this once we have the exn connector
                 NebulousApp.setSalConnector(salConnector);
             }
         } else {
@@ -134,14 +136,13 @@ public class Main implements Callable<Integer> {
             log.info("Preparing ActiveMQ connection: host={} port={}",
                 activemq_host, activemq_port);
             activeMQConnector
-                = new ExnConnector(activemq_host, activemq_port,
-                    activemq_user, activemq_password,
-                    new ConnectorHandler() {
-                        public void onReady(AtomicReference<Context> context) {
-                            log.info("Optimiser-controller connected to ActiveMQ");
-                        }
+              = new ExnConnector(activemq_host, activemq_port,
+                  activemq_user, activemq_password,
+                  new ConnectorHandler() {
+                    public void onReady(AtomicReference<Context> context) {
+                      log.info("Optimiser-controller connected to ActiveMQ");
                     }
-            );
+                  });
         } else {
             log.info("ActiveMQ login info not set, only operating locally.");
         }

optimiser-controller/src/main/java/eu/nebulouscloud/optimiser/controller/NebulousApp.java

@@ -162,6 +162,7 @@ public class NebulousApp {
         }
         this.UUID = app_message.at(uuid_path).textValue();
         this.app_name = app_message.at(name_path).textValue();
+        log.info("New App instantiated: Name='{}', UUID='{}'", app_name, UUID);
     }
 
     /**
@@ -306,6 +307,10 @@ public class NebulousApp {
      * Calculate AMPL file and send it off to the right channel.
      */
     public void sendAMPL() {
+        if (ampl_message_channel == null) {
+            log.error("AMPL publisher not set, cannot send AMPL file");
+            return;
+        }
         String ampl = generateAMPL();
         ObjectNode msg = mapper.createObjectNode();
         msg.put(getUUID() + ".ampl", ampl);