Github user neykov commented on a diff in the pull request:
https://github.com/apache/brooklyn-server/pull/564#discussion_r103450036
--- Diff:
core/src/main/java/org/apache/brooklyn/feed/AbstractCommandFeed.java ---
@@ -0,0 +1,260 @@
+/*
+ * 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.feed;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.Callable;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.brooklyn.api.entity.Entity;
+import org.apache.brooklyn.api.entity.EntityLocal;
+import org.apache.brooklyn.api.location.MachineLocation;
+import org.apache.brooklyn.config.ConfigKey;
+import org.apache.brooklyn.core.config.ConfigKeys;
+import org.apache.brooklyn.core.feed.AbstractFeed;
+import org.apache.brooklyn.core.feed.AttributePollHandler;
+import org.apache.brooklyn.core.feed.DelegatingPollHandler;
+import org.apache.brooklyn.core.feed.Poller;
+import org.apache.brooklyn.core.location.Locations;
+import org.apache.brooklyn.feed.ssh.SshPollValue;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.apache.brooklyn.util.time.Duration;
+
+import com.google.common.base.Objects;
+import com.google.common.base.Supplier;
+import com.google.common.base.Suppliers;
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.SetMultimap;
+import com.google.common.collect.Sets;
+import com.google.common.reflect.TypeToken;
+
+/**
+ * Provides a feed of attribute values, by polling over ssh.
+ *
+ * Example usage (e.g. in an entity that extends SoftwareProcessImpl):
+ * <pre>
+ * {@code
+ * private SshFeed feed;
+ *
+ * //@Override
+ * protected void connectSensors() {
+ * super.connectSensors();
+ *
+ * feed = SshFeed.builder()
+ * .entity(this)
+ * .machine(mySshMachineLachine)
+ * .poll(new CommandPollConfig<Boolean>(SERVICE_UP)
+ * .command("rabbitmqctl -q status")
+ * .onSuccess(new Function<SshPollValue, Boolean>() {
+ * public Boolean apply(SshPollValue input) {
+ * return (input.getExitStatus() == 0);
+ * }}))
+ * .build();
+ * }
+ *
+ * {@literal @}Override
+ * protected void disconnectSensors() {
+ * super.disconnectSensors();
+ * if (feed != null) feed.stop();
+ * }
+ * }
+ * </pre>
+ *
+ * @author aled
--- End diff --
The comment is not accurate for this class. Could replace it with
references to the implementing classes.
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