MemoryInfoResourceProvider.java

/*
 * The contents of this file are subject to the terms of the Common Development and
 * Distribution License (the License). You may not use this file except in compliance with the
 * License.
 *
 * You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
 * specific language governing permission and limitations under the License.
 *
 * When distributing Covered Software, include this CDDL Header Notice in each file and include
 * the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
 * Header, with the fields enclosed by brackets [] replaced by your own identifying
 * information: "Portions copyright [year] [name of copyright owner]".
 *
 * Copyright 2015 ForgeRock AS.
 */

package org.forgerock.openidm.info.health;

import static org.forgerock.json.JsonValue.field;
import static org.forgerock.json.JsonValue.json;
import static org.forgerock.json.JsonValue.object;
import static org.forgerock.json.resource.Responses.newResourceResponse;

import org.forgerock.services.context.Context;
import org.forgerock.json.JsonValue;
import org.forgerock.json.resource.ReadRequest;
import org.forgerock.json.resource.ResourceException;
import org.forgerock.json.resource.ResourceResponse;
import org.forgerock.util.promise.Promise;

import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;

/**
 * Gets Memory usage data from the {@link java.lang.management.MemoryMXBean MemoryMXBean}.
 */
public class MemoryInfoResourceProvider extends AbstractInfoResourceProvider {
    @Override
    public Promise<ResourceResponse, ResourceException> readInstance(Context context, ReadRequest request) {
        final MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();

        final JsonValue result = json(object(
                field("objectPendingFinalization", memoryMXBean.getObjectPendingFinalizationCount()),
                field("heapMemoryUsage", object(
                        field("init", memoryMXBean.getHeapMemoryUsage().getInit()),
                        field("used", memoryMXBean.getHeapMemoryUsage().getUsed()),
                        field("committed", memoryMXBean.getHeapMemoryUsage().getCommitted()),
                        field("max", memoryMXBean.getHeapMemoryUsage().getMax())
                )),
                field("nonHeapMemoryUsage", object(
                        field("init", memoryMXBean.getNonHeapMemoryUsage().getInit()),
                        field("used", memoryMXBean.getNonHeapMemoryUsage().getUsed()),
                        field("committed", memoryMXBean.getNonHeapMemoryUsage().getCommitted()),
                        field("max", memoryMXBean.getNonHeapMemoryUsage().getMax())
                ))
        ));

        return newResourceResponse("", "", result).asPromise();
    }
}