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GravitonServer.java
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GravitonServer.java
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/*
* Copyright 2023 Datastrato.
* This software is licensed under the Apache License version 2.
*/
package com.datastrato.graviton.server;
import com.datastrato.graviton.GravitonEnv;
import com.datastrato.graviton.catalog.CatalogManager;
import com.datastrato.graviton.catalog.CatalogOperationDispatcher;
import com.datastrato.graviton.meta.MetalakeManager;
import com.datastrato.graviton.server.web.JettyServer;
import com.datastrato.graviton.server.web.ObjectMapperProvider;
import com.datastrato.graviton.server.web.VersioningFilter;
import javax.servlet.Servlet;
import org.glassfish.hk2.utilities.binding.AbstractBinder;
import org.glassfish.jersey.jackson.JacksonFeature;
import org.glassfish.jersey.server.ResourceConfig;
import org.glassfish.jersey.servlet.ServletContainer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class GravitonServer extends ResourceConfig {
private static final Logger LOG = LoggerFactory.getLogger(GravitonServer.class);
private static final String CONF_FILE = "graviton.conf";
private final ServerConfig serverConfig;
private final JettyServer server;
private final GravitonEnv gravitonEnv;
public GravitonServer() {
serverConfig = new ServerConfig();
server = new JettyServer();
gravitonEnv = GravitonEnv.getInstance();
}
public void initialize() {
try {
serverConfig.loadFromFile(CONF_FILE);
} catch (Exception exception) {
LOG.warn(
"Failed to load conf from file {}, using default conf instead", CONF_FILE, exception);
}
server.initialize(serverConfig);
gravitonEnv.initialize(serverConfig);
// initialize Jersey REST API resources.
initializeRestApi();
}
private void initializeRestApi() {
packages("com.datastrato.graviton.server.web.rest");
register(
new AbstractBinder() {
@Override
protected void configure() {
bind(gravitonEnv.metalakesManager()).to(MetalakeManager.class).ranked(1);
bind(gravitonEnv.catalogManager()).to(CatalogManager.class).ranked(1);
bind(gravitonEnv.catalogOperationDispatcher())
.to(CatalogOperationDispatcher.class)
.ranked(1);
}
});
register(ObjectMapperProvider.class).register(JacksonFeature.class);
Servlet servlet = new ServletContainer(this);
server.addServlet(servlet, "/api/*");
server.addFilter(new VersioningFilter(), "/api/*");
}
public void start() throws Exception {
server.start();
}
public void join() {
server.join();
}
public void stop() {
server.stop();
gravitonEnv.shutdown();
}
public static void main(String[] args) throws Exception {
LOG.info("Starting Graviton Server");
GravitonServer server = new GravitonServer();
server.initialize();
try {
// Instantiates GravitonServer
server.start();
} catch (Exception e) {
LOG.error("Error while running jettyServer", e);
System.exit(-1);
}
LOG.info("Done, Graviton server started.");
Runtime.getRuntime()
.addShutdownHook(
new Thread(
() -> {
LOG.info("Shutting down Graviton Server ... ");
try {
server.stop();
Thread.sleep(server.serverConfig.get(ServerConfig.SERVER_SHUTDOWN_TIMEOUT));
} catch (InterruptedException e) {
LOG.error("Interrupted exception:", e);
} catch (Exception e) {
LOG.error("Error while stopping servlet container", e);
}
LOG.info("Graviton Server has shut down.");
}));
server.join();
}
}