TimeFilter.java

/*
 * #%L
 * Wisdom-Framework
 * %%
 * Copyright (C) 2013 - 2014 Wisdom Framework
 * %%
 * 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.
 * #L%
 */
// tag::controller[]
package snippets.interceptors;

import org.apache.felix.ipojo.annotations.Component;
import org.apache.felix.ipojo.annotations.Instantiate;
import org.apache.felix.ipojo.annotations.Provides;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.wisdom.api.http.Result;
import org.wisdom.api.interception.Filter;
import org.wisdom.api.interception.RequestContext;
import org.wisdom.api.router.Route;

import java.util.regex.Pattern;

/**
 * A filter measuring the time spent to compute the time spent to handle an action
 */
@Component
@Provides
@Instantiate
public class TimeFilter  implements Filter {

    private static final Logger LOGGER = LoggerFactory.getLogger(TimeFilter.class.getName());

    private static final Pattern REGEX = Pattern.compile("/documentation.*");

    @Override
    public Result call(Route route, RequestContext context) throws Exception {
        final long begin = System.currentTimeMillis();
        try {
            return context.proceed();
        } finally {
            final long end = System.currentTimeMillis();
            LOGGER.info("Time spent to reply to {} {} : {} ms",
                    route.getHttpMethod(), context.context().path(),
                    (end - begin));
        }
    }

    /**
     * Gets the Regex Pattern used to determine whether the route
     * is handled by the filter or not.
     * Notice that the router are caching these patterns and so
     * cannot changed.
     */
    @Override
    public Pattern uri() {
        return REGEX;
    }

    /**
     * Gets the filter priority, determining the position of the
     * filter in the filter chain. Filter with a high
     * priority are called first. Notice that the router are caching
     * these priorities and so cannot changed.
     * <p/>
     * It is heavily recommended to allow configuring the priority
     * from the Application Configuration.
     *
     * @return the priority
     */
    @Override
    public int priority() {
        return 100;
    }
}
// end::controller[]