EventDisplayCommand.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.karaf.event.command;

import static org.apache.karaf.event.service.TopicPredicate.matchTopic;

import org.apache.karaf.event.service.EventCollector;
import org.apache.karaf.shell.api.action.Action;
import org.apache.karaf.shell.api.action.Argument;
import org.apache.karaf.shell.api.action.Command;
import org.apache.karaf.shell.api.action.Option;
import org.apache.karaf.shell.api.action.lifecycle.Reference;
import org.apache.karaf.shell.api.action.lifecycle.Service;
import org.apache.karaf.shell.api.console.Session;
import org.osgi.framework.BundleContext;

@Command(scope = "event", name = "display", description = "Shows events")
@Service
public class EventDisplayCommand implements Action {

    @Reference
    Session session;

    @Reference
    BundleContext context;

    @Reference
    EventCollector collector;

    @Argument
    String topicFilter = "*";

    @Option(name = "-v")
    boolean verbose = false;

    @Override
    public Object execute() throws Exception {
        EventPrinter printer = new EventPrinter(session.getConsole(), verbose);
        collector.getEvents().filter(matchTopic(topicFilter)).forEach(printer);
        return null;
    }

}