Github user adriannieto commented on a diff in the pull request:
https://github.com/apache/incubator-brooklyn/pull/924#discussion_r45972994
--- Diff:
software/webapp/src/main/java/org/apache/brooklyn/entity/webapp/JavaWebAppMigrateEffector.java
---
@@ -0,0 +1,115 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.brooklyn.entity.webapp;
+
+import com.google.common.collect.Lists;
+import org.apache.brooklyn.api.entity.Entity;
+import org.apache.brooklyn.api.entity.EntityInitializer;
+import org.apache.brooklyn.api.entity.EntityLocal;
+import org.apache.brooklyn.api.location.Location;
+import org.apache.brooklyn.core.effector.EffectorBody;
+import org.apache.brooklyn.core.entity.Entities;
+import org.apache.brooklyn.core.entity.EntityInternal;
+import org.apache.brooklyn.core.entity.lifecycle.Lifecycle;
+import org.apache.brooklyn.core.entity.lifecycle.ServiceStateLogic;
+import org.apache.brooklyn.core.entity.trait.Startable;
+import org.apache.brooklyn.entity.software.base.AllowsMigration;
+import org.apache.brooklyn.util.collections.MutableMap;
+import org.apache.brooklyn.util.core.config.ConfigBag;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class JavaWebAppMigrateEffector implements EntityInitializer {
+
+ private static final Logger LOG =
LoggerFactory.getLogger(JavaWebAppMigrateEffector.class);
+
+ @Override
+ public void apply(final EntityLocal entity) {
+ if (LOG.isDebugEnabled()) {
+ LOG.debug("Adding Migrate effector to {}", entity);
+ }
+
+ ((EntityInternal)
entity).getMutableEntityType().addEffector(AllowsMigration.MIGRATE, new
EffectorBody<Void>() {
+ @Override
+ public Void call(ConfigBag parameters) {
+ migrate((EntityInternal) entity, (String)
parameters.getStringKey(AllowsMigration.MIGRATE_LOCATION_SPEC));
+ return null;
+ }
+ });
+ }
+
+ private static void migrate(EntityInternal entity, String
locationSpec) {
+ if (ServiceStateLogic.getExpectedState(entity) !=
Lifecycle.RUNNING) {
+ // Is it necessary to check if the whole application is
healthy?
+ throw new RuntimeException("The entity needs to be healthy
before the migration starts");
+ }
+
+ if (entity.getParent() != null &&
!entity.getParent().equals(entity.getApplication())) {
+ /*
+ * TODO: Allow nested entites to be migrated
+ * If the entity has a parent different to the application
root the migration cannot be done right now,
+ * as it could lead into problems to deal with hierarchies
like SameServerEntity -> Entity
+ */
+
+ throw new RuntimeException("Nested entities cannot be migrated
right now");
+ }
+
+ // Retrieving the location from the catalog.
+ Location newLocation =
Entities.getManagementContext(entity).getLocationRegistry().resolve(locationSpec);
+
+ // TODO: Find a better way to check if you're migrating an entity
to the exactly same VM. This not always works.
+ for (Location oldLocation : entity.getLocations()) {
+ if (oldLocation.containsLocation(newLocation)) {
+ LOG.warn("You cannot migrate an entity to the same
location, the migration process will stop right now");
+ return;
+ }
+ }
+
+ LOG.info("Migration process of " + entity.getId() + " started.");
+
+ // When we have the new location, we free the resources of the
current instance
+ entity.invoke(Startable.STOP, MutableMap.<String,
Object>of()).blockUntilEnded();
+
+ // Clearing old locations to remove the relationship with the
previous instance
+ entity.clearLocations();
+ entity.addLocations(Lists.newArrayList(newLocation));
+
+ // Starting the new instance
+ entity.invoke(Startable.START, MutableMap.<String,
Object>of()).blockUntilEnded();
+
+ // Refresh all the dependent entities
+
+ for (Entity applicationChild :
entity.getApplication().getChildren()) {
+ // TODO: Find a better way to refresh the application
configuration.
+ // TODO: Refresh nested entities or find a way to propagate
the restart properly.
+
+ // Restart any entity but the migrated one.
+ if (applicationChild instanceof Startable) {
+ if (entity.equals(applicationChild)) {
+ // The entity is sensors should rewired automatically
on stop() + restart()
+ } else {
+ // Restart the entity to fetch again all the
dependencies (ie. attributeWhenReady ones)
+ ((Startable) applicationChild).restart();
--- End diff --
It totally makes sense for me, the problem is I'm not sure if when the
sensors are republished the entity automatically refreshes himself. I think
not. This is why I'm restarting the entities.
Is there any way to process this "sensor republished" event?
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