/**
* 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.hadoop.gateway.audit.log4j.audit;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.hadoop.gateway.audit.api.AuditContext;
import org.apache.hadoop.gateway.audit.api.AuditService;
import org.apache.hadoop.gateway.audit.api.Auditor;
import org.apache.log4j.MDC;
public class Log4jAuditService implements AuditService {
public static final String MDC_AUDIT_CONTEXT_KEY = "audit_context";
private Map<String, Auditor> auditors = new ConcurrentHashMap<String, Auditor>();
@Override
public AuditContext createContext() {
AuditContext context = getContext();
if ( context == null ) {
context = new Log4jAuditContext();
attachContext( context );
}
return context;
}
@Override
public AuditContext getContext() {
return (Log4jAuditContext) MDC.get( MDC_AUDIT_CONTEXT_KEY );
}
@Override
public void attachContext(AuditContext context) {
if ( context != null ) {
MDC.put( MDC_AUDIT_CONTEXT_KEY, context );
}
}
@Override
public AuditContext detachContext() {
AuditContext context = (AuditContext) MDC.get( MDC_AUDIT_CONTEXT_KEY );
MDC.remove( MDC_AUDIT_CONTEXT_KEY );
return context;
}
@Override
public <T> T execute( AuditContext context, Callable<T> callable ) throws Exception {
try {
attachContext( context );
return callable.call();
} finally {
detachContext();
}
}
@Override
public synchronized Auditor getAuditor( String auditorName, String componentName, String serviceName ) {
String key = auditorName + componentName + serviceName;
Auditor auditor = auditors.get( key );
if( auditor == null ) {
auditor = new Log4jAuditor( auditorName, componentName, serviceName );
auditors.put( key, auditor );
}
return auditor;
}
}