/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate 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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.monitor;

import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.hyperic.sigar.Sigar;

public class SigarService extends AbstractComponent {

    private final Sigar sigar;

    @Inject
    public SigarService(Settings settings) {
        super(settings);
        Sigar sigar = null;
        if (settings.getAsBoolean("bootstrap.sigar", true)) {
            try {
                sigar = new Sigar();
                // call it to make sure the library was loaded
                sigar.getPid();
                logger.trace("sigar loaded successfully");
            } catch (Throwable t) {
                logger.trace("failed to load sigar", t);
                if (sigar != null) {
                    try {
                        sigar.close();
                    } catch (Throwable t1) {
                        // ignore
                    } finally {
                        sigar = null;
                    }
                }
            }
        }
        this.sigar = sigar;
    }

    public boolean sigarAvailable() {
        return sigar != null;
    }

    Sigar sigar() {
        return this.sigar;
    }
}