com.github.kagkarlsson.scheduler.SchedulerName Maven / Gradle / Ivy
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/*
* Copyright (C) Gustav Karlsson
*
* Licensed 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 com.github.kagkarlsson.scheduler;
import java.net.InetAddress;
import java.net.UnknownHostException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public interface SchedulerName {
String getName();
class Fixed implements SchedulerName {
private final String name;
public Fixed(String name) {
this.name = name;
}
@Override
public String getName() {
return name;
}
}
class Hostname implements SchedulerName {
private static final Logger LOG = LoggerFactory.getLogger(Hostname.class);
private String cachedHostname;
public Hostname() {
try {
long start = System.currentTimeMillis();
LOG.debug("Resolving hostname..");
cachedHostname = InetAddress.getLocalHost().getHostName();
LOG.debug("Resolved hostname..");
long duration = System.currentTimeMillis() - start;
if (duration > 1000) {
LOG.warn("Hostname-lookup took {}ms", duration);
}
} catch (UnknownHostException e) {
LOG.warn("Failed to resolve hostname. Using dummy-name for scheduler.");
cachedHostname = "failed.hostname.lookup";
}
}
@Override
public String getName() {
return cachedHostname;
}
}
}