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add kafka announcement only logic (#1027)
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101 changes: 101 additions & 0 deletions
101
d2/src/main/java/com/linkedin/d2/balancer/servers/ConnectionManager.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| package com.linkedin.d2.balancer.servers; | ||
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| import com.linkedin.common.callback.Callback; | ||
| import com.linkedin.common.callback.Callbacks; | ||
| import com.linkedin.common.util.None; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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|
||
| /** | ||
| * ConnectionManager is an abstract class responsible for managing connections to external systems. | ||
| * It can be extended to handle specific service registries (e.g., Zookeeper). | ||
| * For example, see {@link com.linkedin.d2.balancer.servers.ZooKeeperConnectionManager} for managing Zookeeper | ||
| * connections during D2 server announcements. | ||
| * This class provides basic functionalities such as start, shutdown, markDownAllServers, and markUpAllServers which | ||
| * is called during D2 server announcements/de-announcement. | ||
| */ | ||
| public abstract class ConnectionManager | ||
| { | ||
| private final ZooKeeperAnnouncer[] _servers; | ||
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| private static final Logger LOG = LoggerFactory.getLogger(ConnectionManager.class); | ||
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| protected ConnectionManager(ZooKeeperAnnouncer[] servers) | ||
| { | ||
| _servers = servers; | ||
| } | ||
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| abstract public void start(Callback<None> callback); | ||
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| abstract public void shutdown(final Callback<None> callback); | ||
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| abstract public String getAnnouncementTargetIdentifier(); | ||
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| public void markDownAllServers(final Callback<None> callback) | ||
| { | ||
| Callback<None> markDownCallback; | ||
| if (callback != null) | ||
| { | ||
| markDownCallback = callback; | ||
| } | ||
| else | ||
| { | ||
| markDownCallback = new Callback<None>() | ||
| { | ||
| @Override | ||
| public void onError(Throwable e) | ||
| { | ||
| LOG.error("failed to mark down servers", e); | ||
| } | ||
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| @Override | ||
| public void onSuccess(None result) | ||
| { | ||
| LOG.info("mark down all servers successful"); | ||
| } | ||
| }; | ||
| } | ||
| Callback<None> multiCallback = Callbacks.countDown(markDownCallback, _servers.length); | ||
| for (ZooKeeperAnnouncer server : _servers) | ||
| { | ||
| server.markDown(multiCallback); | ||
| } | ||
| } | ||
|
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| public void markUpAllServers(final Callback<None> callback) | ||
| { | ||
| Callback<None> markUpCallback; | ||
| if (callback != null) | ||
| { | ||
| markUpCallback = callback; | ||
| } | ||
| else | ||
| { | ||
| markUpCallback = new Callback<None>() | ||
| { | ||
| @Override | ||
| public void onError(Throwable e) | ||
| { | ||
| LOG.error("failed to mark up servers", e); | ||
| } | ||
|
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||
| @Override | ||
| public void onSuccess(None result) | ||
| { | ||
| LOG.info("mark up all servers successful"); | ||
| } | ||
| }; | ||
| } | ||
| Callback<None> multiCallback = Callbacks.countDown(markUpCallback, _servers.length); | ||
| for (ZooKeeperAnnouncer server : _servers) | ||
| { | ||
| server.markUp(multiCallback); | ||
| } | ||
|
|
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| } | ||
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| public ZooKeeperAnnouncer[] getAnnouncers() | ||
| { | ||
| return _servers; | ||
| } | ||
| } |
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