/*
 * Copyright 2006 Niclas Hedhman.
 *
 * 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 org.qi4j.logging.trace;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import org.qi4j.api.Qi4j;
import org.qi4j.api.common.Optional;
import org.qi4j.api.composite.Composite;
import org.qi4j.api.concern.ConcernOf;
import org.qi4j.api.injection.scope.Service;
import org.qi4j.api.injection.scope.Structure;
import org.qi4j.logging.trace.service.TraceService;


public abstract class AbstractTraceConcern extends ConcernOf<InvocationHandler>
    implements InvocationHandler
{
    @Structure private Qi4j api;
    @Optional @Service protected TraceService traceService;
    private Composite thisComposite;
    private Class compositeType;

    public AbstractTraceConcern( Composite thisComposite )
    {
        this.thisComposite = thisComposite;
        compositeType = thisComposite.getClass().getInterfaces()[ 0 ];
    }

    @Override
    public Object invoke( Object proxy, Method method, Object[] args )
        throws Throwable
    {
        boolean doTrace = traceService != null && doTrace();
        Object result;
        long entryTime = 0;
        long timeStamp = 0;
        try
        {
            if( doTrace )
            {
                entryTime = System.currentTimeMillis();
                timeStamp = System.nanoTime();
            }
            result = next.invoke( proxy, method, args );
            if( doTrace )
            {
                long duration = System.nanoTime() - timeStamp;
                traceService.traceSuccess( compositeType, api.dereference( thisComposite ), method, args, result, entryTime, duration );
            }
        }
        catch( Throwable t )
        {
            if( doTrace )
            {
                long duration = System.nanoTime() - timeStamp;
                Composite object = api.dereference( thisComposite );
                traceService.traceException( compositeType, object, method, args, t, entryTime, duration );
            }
            throw t;
        }
        return result;
    }

    protected boolean doTrace()
    {
        return true;
    }
}
