Github user neykov commented on a diff in the pull request:
https://github.com/apache/brooklyn-server/pull/287#discussion_r73865586
--- Diff:
core/src/main/java/org/apache/brooklyn/entity/group/SshCommandMembershipTrackingPolicy.java
---
@@ -0,0 +1,105 @@
+/*
+ * 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.group;
+
+import java.util.Map;
+import java.util.concurrent.ExecutionException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.brooklyn.api.entity.Entity;
+import org.apache.brooklyn.config.ConfigKey;
+import org.apache.brooklyn.core.config.ConfigKeys;
+import org.apache.brooklyn.core.config.MapConfigKey;
+import org.apache.brooklyn.core.effector.ssh.SshEffectorTasks;
+import org.apache.brooklyn.core.entity.BrooklynConfigKeys;
+import org.apache.brooklyn.core.entity.EntityInternal;
+import org.apache.brooklyn.core.location.Machines;
+import org.apache.brooklyn.core.sensor.ssh.SshCommandSensor;
+import org.apache.brooklyn.location.ssh.SshMachineLocation;
+import org.apache.brooklyn.util.collections.MutableMap;
+import org.apache.brooklyn.util.core.json.ShellEnvironmentSerializer;
+import org.apache.brooklyn.util.core.task.DynamicTasks;
+import org.apache.brooklyn.util.core.task.Tasks;
+import org.apache.brooklyn.util.exceptions.Exceptions;
+import org.apache.brooklyn.util.guava.Maybe;
+import org.apache.brooklyn.util.text.Strings;
+
+/**
+ * Policy which tracks membership of a group, and executes SSH commands
+ * on MEMBER{ADDED,REMOVED} events, as well as SERVICE_UP {true,false} for
those members.
+ */
+public class SshCommandMembershipTrackingPolicy extends
AbstractMembershipTrackingPolicy {
+
+ private static final Logger LOG =
LoggerFactory.getLogger(SshCommandMembershipTrackingPolicy.class);
+
+ public static final ConfigKey<String> EXECUTION_DIR =
ConfigKeys.newStringConfigKey("executionDir", "Directory where the command
should run; "
+ + "if not supplied, executes in the entity's run dir (or home dir
if no run dir is defined); "
+ + "use '~' to always execute in the home dir, or 'custom-feed/' to
execute in a custom-feed dir relative to the run dir");
+
+ public static final MapConfigKey<Object> SHELL_ENVIRONMENT =
BrooklynConfigKeys.SHELL_ENVIRONMENT;
+
+ public static final ConfigKey<String> UPDATE_COMMAND =
ConfigKeys.newStringConfigKey("update.command", "Command to run on membership
change events");
+
+ /**
+ * Called when a member is updated or group membership changes.
+ */
+ @Override
+ protected void onEntityEvent(EventType type, Entity entity) {
+ LOG.trace("Event {} received for {} in {}", new Object[] { type,
entity, getGroup() });
+ String command = config().get(UPDATE_COMMAND);
+ if (Strings.isNonBlank(command)) {
+ execute(command);
+ }
+ }
+
+ public void execute(String command) {
+ Maybe<SshMachineLocation> machine =
Machines.findUniqueMachineLocation(entity.getLocations(),
SshMachineLocation.class);
--- End diff --
Suggest to use `Locations.getLocationsCheckingAncestors(...)` here. For
example when an entity is nested in a `SameServerEntity`.
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