/*******************************************************************************
.
. This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0 which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors: IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.test.internal.performance;

import java.util.Map;

import org.eclipse.test.internal.performance.data.Dim;
import org.eclipse.test.internal.performance.data.Scalar;

class PerformanceMonitor {

    private static PerformanceMonitor fgPerformanceMonitor;

    public static PerformanceMonitor getPerformanceMonitor() {
        if (fgPerformanceMonitor == null) {
            String os = System.getProperty("os.name"); //$NON-NLS-1$
            if (os.startsWith("Windows")) //$NON-NLS-1$
                fgPerformanceMonitor = new PerformanceMonitorWindows();
            else if (os.startsWith("Mac OS X")) //$NON-NLS-1$
                fgPerformanceMonitor = new PerformanceMonitorMac();
            else
                fgPerformanceMonitor = new PerformanceMonitorLinux();
        }
        return fgPerformanceMonitor;
    }

    protected void collectOperatingSystemCounters(Map scalars) {
        Runtime runtime = Runtime.getRuntime();
        // runtime.gc();
        addScalar(scalars, InternalDimensions.USED_JAVA_HEAP, runtime.totalMemory() - runtime.freeMemory());
    }

    protected void collectGlobalPerformanceInfo(Map scalars) {
        // no default implementation
    }

    void addScalar(Map scalars, Dim dimension, long value) {
        scalars.put(dimension, new Scalar(dimension, value));
    }
}