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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| package org.kairosdb.core; | ||
|
|
||
| import com.google.common.annotations.VisibleForTesting; | ||
| import com.google.common.collect.ImmutableMap; | ||
| import com.google.inject.Inject; | ||
| import com.google.inject.name.Named; | ||
| import org.kairosdb.core.datastore.ServiceKeyStore; | ||
| import org.kairosdb.core.datastore.ServiceKeyValue; | ||
| import org.kairosdb.core.exception.DatastoreException; | ||
| import org.kairosdb.core.exception.KairosDBException; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.concurrent.ScheduledExecutorService; | ||
|
|
||
| import static com.google.common.base.Preconditions.checkNotNull; | ||
| import static org.kairosdb.util.Preconditions.checkNotNullOrEmpty; | ||
|
|
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| public class HostManager implements KairosDBService | ||
| { | ||
| private static final Logger logger = LoggerFactory.getLogger(HostManager.class); | ||
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|
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| private static final String SERVICE = "_Hosts"; | ||
| private static final String SERVICE_KEY = "Active"; | ||
| private static final String DELAY = "kairosdb.host_service_manager.check_delay_time_millseconds"; | ||
| private static final String INACTIVE_TIME = "kairosdb.host_service_manager.inactive_time_seconds"; | ||
| public static final String HOST_MANAGER_SERVICE_EXECUTOR = "HostManagerServiceExecutor"; | ||
|
|
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| private final ServiceKeyStore keyStore; | ||
| private final String hostname; | ||
| private final long inactiveTimeSeconds; | ||
| private final String guid; | ||
| private ScheduledExecutorService executorService; | ||
|
|
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| private volatile Map<String, ServiceKeyValue> activeHosts = new HashMap<>(); | ||
|
|
||
| @Inject | ||
| public HostManager(ServiceKeyStore keyStore, | ||
| @Named(HOST_MANAGER_SERVICE_EXECUTOR) ScheduledExecutorService executorService, | ||
| @Named(DELAY) long delay, @Named("HOSTNAME") String hostName, @Named(INACTIVE_TIME) long inactiveTime, | ||
| @Named(Main.KAIROSDB_SERVER_GUID) String guid) | ||
| { | ||
| this.keyStore = checkNotNull(keyStore, "keyStore cannot be null"); | ||
| this.executorService = checkNotNull(executorService, "executorService cannot be null"); | ||
| this.hostname = checkNotNullOrEmpty(hostName, "hostname cannot be null or empty"); | ||
| this.inactiveTimeSeconds = inactiveTime; | ||
| this.guid = checkNotNullOrEmpty(guid, "guid cannot be null or empty"); | ||
|
|
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| executorService.scheduleWithFixedDelay(new CheckChanges(), 0, delay, java.util.concurrent.TimeUnit.MILLISECONDS); | ||
| } | ||
|
|
||
| private class CheckChanges implements Runnable | ||
| { | ||
| @Override | ||
| public void run() | ||
| { | ||
| checkHostChanges(); | ||
| } | ||
| } | ||
|
|
||
| @VisibleForTesting | ||
| void checkHostChanges() | ||
| { | ||
| try { | ||
| // Add this host to the table if it doesn't exist or update its timestamp | ||
| keyStore.setValue(SERVICE, SERVICE_KEY, guid, hostname); | ||
|
|
||
| Map<String, ServiceKeyValue> hosts = getHostsFromKeyStore(); | ||
|
|
||
| // Remove inactive nodes from the table | ||
| long now = System.currentTimeMillis(); | ||
| for (String guid : hosts.keySet()) { | ||
| ServiceKeyValue host = hosts.get(guid); | ||
| if ((host.getLastModified().getTime() + (1000 * inactiveTimeSeconds)) < now) { | ||
| keyStore.deleteKey(SERVICE, SERVICE_KEY, guid); | ||
| } | ||
| } | ||
|
|
||
| // update cache | ||
| activeHosts = getHostsFromKeyStore(); | ||
| } | ||
| catch (Throwable e) { | ||
| logger.error("Could not access keystore " + SERVICE + ":" + SERVICE_KEY); | ||
| } | ||
| } | ||
|
|
||
| private Map<String, ServiceKeyValue> getHostsFromKeyStore() | ||
| throws DatastoreException | ||
| { | ||
| Map<String, ServiceKeyValue> hosts = new HashMap<>(); | ||
| Iterable<String> guids = keyStore.listKeys(SERVICE, SERVICE_KEY); | ||
| for (String guid : guids) { | ||
| ServiceKeyValue value = keyStore.getValue(SERVICE, SERVICE_KEY, guid); | ||
| if (value != null) { | ||
| hosts.put(guid, value); | ||
| } | ||
| } | ||
| return hosts; | ||
| } | ||
|
|
||
| /** | ||
| * Returns a map of kairos hosts. The key is a guid nd the value is the hostname. There should always be at least one in the map (the current kairos node). | ||
| * @return list of kairos hosts. | ||
| */ | ||
| public Map<String, ServiceKeyValue> getActiveKairosHosts() | ||
| { | ||
| return ImmutableMap.copyOf(activeHosts); | ||
| } | ||
|
|
||
| @Override | ||
| public void start() | ||
| throws KairosDBException | ||
| { | ||
| } | ||
|
|
||
| @Override | ||
| public void stop() | ||
| { | ||
| executorService.shutdown(); | ||
| } | ||
| } |
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