/*
* 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.nosql.redis;
import java.util.concurrent.TimeUnit;
import javax.annotation.Nullable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.brooklyn.api.location.Location;
import org.apache.brooklyn.api.location.MachineLocation;
import org.apache.brooklyn.entity.software.base.SoftwareProcessImpl;
import org.apache.brooklyn.feed.ssh.SshFeed;
import org.apache.brooklyn.feed.ssh.SshPollConfig;
import org.apache.brooklyn.feed.ssh.SshPollValue;
import org.apache.brooklyn.feed.ssh.SshValueFunctions;
import org.apache.brooklyn.location.ssh.SshMachineLocation;
import com.google.common.base.Function;
import com.google.common.base.Functions;
import com.google.common.base.Optional;
import com.google.common.base.Predicates;
import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;
/**
* An entity that represents a Redis key-value store service.
*/
public class RedisStoreImpl extends SoftwareProcessImpl implements RedisStore {
@SuppressWarnings("unused")
private static final Logger LOG = LoggerFactory.getLogger(RedisStoreImpl.class);
private transient SshFeed sshFeed;
public RedisStoreImpl() {
}
@Override
protected void connectSensors() {
super.connectSensors();
connectServiceUpIsRunning();
// Find an SshMachineLocation for the UPTIME feed
Optional<Location> location = Iterables.tryFind(getLocations(), Predicates.instanceOf(SshMachineLocation.class));
if (!location.isPresent()) throw new IllegalStateException("Could not find SshMachineLocation in list of locations");
SshMachineLocation machine = (SshMachineLocation) location.get();
String statsCommand = getDriver().getRunDir() + "/bin/redis-cli -p " + getRedisPort() + " info stats";
boolean retrieveUsageMetrics = getConfig(RETRIEVE_USAGE_METRICS);
sshFeed = SshFeed.builder()
.entity(this)
.machine(machine)
.period(5, TimeUnit.SECONDS)
.poll(new SshPollConfig<Integer>(UPTIME)
.command(getDriver().getRunDir() + "/bin/redis-cli -p " + getRedisPort() + " info server")
.onFailureOrException(Functions.constant(-1))
.onSuccess(infoFunction("uptime_in_seconds"))
.enabled(retrieveUsageMetrics))
.poll(new SshPollConfig<Integer>(TOTAL_CONNECTIONS_RECEIVED)
.command(statsCommand)
.onFailureOrException(Functions.constant(-1))
.onSuccess(infoFunction("total_connections_received"))
.enabled(retrieveUsageMetrics))
.poll(new SshPollConfig<Integer>(TOTAL_COMMANDS_PROCESSED)
.command(statsCommand)
.onFailureOrException(Functions.constant(-1))
.onSuccess(infoFunction("total_commands_processed"))
.enabled(retrieveUsageMetrics))
.poll(new SshPollConfig<Integer>(EXPIRED_KEYS)
.command(statsCommand)
.onFailureOrException(Functions.constant(-1))
.onSuccess(infoFunction("expired_keys"))
.enabled(retrieveUsageMetrics))
.poll(new SshPollConfig<Integer>(EVICTED_KEYS)
.command(statsCommand)
.onFailureOrException(Functions.constant(-1))
.onSuccess(infoFunction("evicted_keys"))
.enabled(retrieveUsageMetrics))
.poll(new SshPollConfig<Integer>(KEYSPACE_HITS)
.command(statsCommand)
.onFailureOrException(Functions.constant(-1))
.onSuccess(infoFunction("keyspace_hits"))
.enabled(retrieveUsageMetrics))
.poll(new SshPollConfig<Integer>(KEYSPACE_MISSES)
.command(statsCommand)
.onFailureOrException(Functions.constant(-1))
.onSuccess(infoFunction("keyspace_misses"))
.enabled(retrieveUsageMetrics))
.build();
}
/**
* Create a {@link Function} to retrieve a particular field value from a {@code redis-cli info}
* command.
*
* @param field the info field to retrieve and convert
* @return a new function that converts a {@link SshPollValue} to an {@link Integer}
*/
private static Function<SshPollValue, Integer> infoFunction(final String field) {
return Functions.compose(new Function<String, Integer>() {
@Override
public Integer apply(@Nullable String input) {
Optional<String> line = Iterables.tryFind(Splitter.on('\n').split(input), Predicates.containsPattern(field + ":"));
if (line.isPresent()) {
String data = line.get().trim();
int colon = data.indexOf(":");
return Integer.parseInt(data.substring(colon + 1));
} else {
throw new IllegalStateException("Data for field "+field+" not found: "+input);
}
}
}, SshValueFunctions.stdout());
}
@Override
public void disconnectSensors() {
disconnectServiceUpIsRunning();
if (sshFeed != null) sshFeed.stop();
super.disconnectSensors();
}
@Override
public Class<?> getDriverInterface() {
return RedisStoreDriver.class;
}
@Override
public RedisStoreDriver getDriver() {
return (RedisStoreDriver) super.getDriver();
}
@Override
public String getAddress() {
MachineLocation machine = getMachineOrNull();
return (machine != null) ? machine.getAddress().getHostAddress() : null;
}
@Override
public Integer getRedisPort() {
return getAttribute(RedisStore.REDIS_PORT);
}
}