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Java performance monitoring framework, including PCP bridge

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/*
 * Copyright 2009-2017 Aconex
 *
 * 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 io.pcp.parfait.timing;

import java.util.Collections;

import io.pcp.parfait.MonitorableRegistry;


/**
 * A dummy EventTimer which implements all functionality as no-ops.
 */
public final class DummyEventTimer extends EventTimer {
    private static final EventMetricCollector DUMMY_EVENT_METRIC_COLLECTOR = new EventMetricCollector(
            null, Collections.emptyList()) {
        @Override
        public void startTiming(Object eventGroup, String event) {
            // no-op
        }

        @Override
        public void stopTiming() {
            // no-op
        }

        @Override
        public void pauseForForward() {
            // no-op
        }

        @Override
        public void resumeAfterForward() {
            // no-op
        }
    };

    public DummyEventTimer() {
        super("dummy", new MonitorableRegistry(), ThreadMetricSuite.blank(), false, false,
                Collections.emptyList());
    }
    
    public EventMetricCollector getCollector() {
        return DUMMY_EVENT_METRIC_COLLECTOR;
    }

    public void registerTimeable(Timeable timeable, String eventGroup) {
        timeable.setEventTimer(this);
    }

}