Github user joshelser commented on a diff in the pull request:
https://github.com/apache/phoenix/pull/236#discussion_r122323098
--- Diff:
phoenix-queryserver/src/main/java/org/apache/phoenix/queryserver/server/QueryServer.java
---
@@ -233,16 +240,29 @@ public int run(String[] args) throws Exception {
// Build and start the HttpServer
server = builder.build();
server.start();
+ registerToServiceProvider(hostname);
runningLatch.countDown();
server.join();
return 0;
} catch (Throwable t) {
LOG.fatal("Unrecoverable service error. Shutting down.", t);
this.t = t;
return -1;
+ } finally {
+ deRegister();
}
}
+ private void registerToServiceProvider(String hostName) throws Exception
{
+ PqsZookeeperConf pqsZookeeperConf = new
PqsZookeeperConfImpl(getConf());
--- End diff --
Here's an example from Avatica on how it uses ServiceLoader to pull Metrics
backend systems:
A [factory interface is defined in one
module](https://github.com/apache/calcite-avatica/blob/master/metrics/src/main/java/org/apache/calcite/avatica/metrics/MetricsSystemFactory.java),
an [implementation is defined in a different
module](https://github.com/apache/calcite-avatica/blob/master/metrics-dropwizardmetrics3/src/main/java/org/apache/calcite/avatica/metrics/dropwizard3/DropwizardMetricsSystemFactory.java),
a [services file is created stating that the implementation is present for the
interface](https://github.com/apache/calcite-avatica/blob/master/metrics-dropwizardmetrics3/src/main/resources/META-INF/services/org.apache.calcite.avatica.metrics.MetricsSystemFactory),
the Avatica server [loads an implementation of the interface using
ServiceLoader](https://github.com/apache/calcite-avatica/blob/master/server/src/main/java/org/apache/calcite/avatica/server/HandlerFactory.java#L114)
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