com.bigdata.service.DefaultServiceFederationDelegate Maven / Gradle / Ivy
/*
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
[email protected]
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Sep 17, 2008
*/
package com.bigdata.service;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.UUID;
import org.apache.log4j.Logger;
import com.bigdata.counters.CounterSet;
import com.bigdata.counters.ICounterSetAccess;
import com.bigdata.counters.IProcessCounters;
import com.bigdata.counters.httpd.CounterSetHTTPD;
import com.bigdata.io.DirectBufferPool;
import com.bigdata.util.httpd.AbstractHTTPD;
/**
* Basic delegate for services that need to override the service UUID and
* service interface reported to the {@link ILoadBalancerService}.
*
* @author Bryan Thompson
* @version $Id$
*/
public class DefaultServiceFederationDelegate
implements IFederationDelegate {
protected final static Logger log = Logger
.getLogger(DefaultServiceFederationDelegate.class);
final protected T service;
public DefaultServiceFederationDelegate(final T service) {
if (service == null)
throw new IllegalArgumentException();
this.service = service;
}
public T getService() {
return service;
}
public String getServiceName() {
return service.getServiceName();
}
public UUID getServiceUUID() {
return service.getServiceUUID();
}
public Class getServiceIface() {
return service.getServiceIface();
}
public void reattachDynamicCounters() {
/* Reattaches the {@link DirectBufferPool} counters. */
// The service's counter set hierarchy.
final CounterSet serviceRoot = service.getFederation()
.getServiceCounterSet();
// Ensure path exists.
final CounterSet tmp = serviceRoot.makePath(IProcessCounters.Memory);
/*
* Add counters reporting on the various DirectBufferPools.
*/
synchronized (tmp) {
// detach the old counters (if any).
tmp.detach("DirectBufferPool");
// attach the current counters.
tmp.makePath("DirectBufferPool").attach(
DirectBufferPool.getCounters());
}
}
/**
* Returns true
*/
public boolean isServiceReady() {
return true;
}
/**
* NOP
*/
public void didStart() {
}
/** NOP */
public void serviceJoin(IService service, UUID serviceUUID) {
}
/** NOP */
public void serviceLeave(UUID serviceUUID) {
}
public AbstractHTTPD newHttpd(final int httpdPort,
final ICounterSetAccess access) throws IOException {
return new CounterSetHTTPD(httpdPort, access, service) {
@Override
public Response doGet(final Request req) throws Exception {
try {
reattachDynamicCounters();
} catch (Exception ex) {
/*
* Typically this is because the live journal has been
* concurrently closed during the request.
*/
log.warn("Could not re-attach dynamic counters: " + ex, ex);
}
return super.doGet(req);
}
};
}
/**
* Writes the URL of the local httpd service for the {@link DataService}
* onto a file named httpd.url in the specified directory.
*/
protected void logHttpdURL(final File file) {
// delete in case old version exists.
file.delete();
final String httpdURL = service.getFederation().getHttpdURL();
if (httpdURL != null) {
try {
final Writer w = new BufferedWriter(new FileWriter(file));
try {
w.write(httpdURL);
} finally {
w.close();
}
} catch (IOException ex) {
log.warn("Problem writing httpdURL on file: " + file);
}
}
}
}
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