/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.solr.handler;
import java.io.File;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.params.CommonParams;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.core.SolrCore;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.request.SolrRequestHandler;
import org.apache.solr.response.SolrQueryResponse;
/**
* Ping solr core
*
* @since solr 1.3
*/
public class PingRequestHandler extends RequestHandlerBase
{
@Override
public void handleRequestBody(SolrQueryRequest req, SolrQueryResponse rsp) throws Exception
{
SolrParams params = req.getParams();
SolrParams required = params.required();
SolrCore core = req.getCore();
// Check if the service is available
String healthcheck = core.getSolrConfig().get("admin/healthcheck/text()", null );
if( healthcheck != null && !new File(healthcheck).exists() ) {
throw new SolrException(SolrException.ErrorCode.SERVICE_UNAVAILABLE, "Service disabled", true);
}
// Get the RequestHandler
String qt = required.get( CommonParams.QT );
SolrRequestHandler handler = core.getRequestHandler( qt );
if( handler == null ) {
throw new SolrException(SolrException.ErrorCode.BAD_REQUEST,
"Unknown RequestHandler: "+qt );
}
if( handler instanceof PingRequestHandler ) {
throw new SolrException(SolrException.ErrorCode.BAD_REQUEST,
"Cannot execute the PingRequestHandler recursively" );
}
// Execute the ping query and catch any possible exception
Throwable ex = null;
try {
SolrQueryResponse pingrsp = new SolrQueryResponse();
core.execute(handler, req, pingrsp );
ex = pingrsp.getException();
}
catch( Throwable th ) {
ex = th;
}
// Send an error or an 'OK' message (response code will be 200)
if( ex != null ) {
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR,
"Ping query caused exception: "+ex.getMessage(), ex );
}
rsp.add( "status", "OK" );
}
//////////////////////// SolrInfoMBeans methods //////////////////////
@Override
public String getVersion() {
return "$Revision: 1142180 $";
}
@Override
public String getDescription() {
return "Reports application health to a load-balancer";
}
@Override
public String getSourceId() {
return "$Id: PingRequestHandler.java 1142180 2011-07-02 09:04:29Z uschindler $";
}
@Override
public String getSource() {
return "$URL: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_3_5/solr/core/src/java/org/apache/solr/handler/PingRequestHandler.java $";
}
}