metrics/osgi/collector/src/main/java/org/apache/felix/metrics/osgi/impl/Activator.java

/*
 * 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.felix.metrics.osgi.impl;

import org.osgi.annotation.bundle.Header;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;

@Header(name = Constants.BUNDLE_ACTIVATOR, value = "${@class}")
// avoid dependency to SCR so we can start early on
public class Activator implements BundleActivator {

    private BundleStartTimeCalculator bstc;
    private StartupTimeCalculator stc;
    private ServiceRestartCountCalculator srcc;

    @Override
    public void start(BundleContext context) throws Exception {
        
        bstc = new BundleStartTimeCalculator(context.getBundle().getBundleId());
        context.addBundleListener(bstc);

        srcc = new ServiceRestartCountCalculator();
        context.addServiceListener(srcc);

        stc = new StartupTimeCalculator(context, bstc, srcc);
    }

    @Override
    public void stop(BundleContext context) throws Exception {
        stc.close();
        context.removeServiceListener(srcc);
        context.removeBundleListener(bstc);
    }

}