org.cloudata.core.common.metrics.CloudataMetricsFactory.java Source code

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Here is the source code for org.cloudata.core.common.metrics.CloudataMetricsFactory.java

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/**
 * 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.cloudata.core.common.metrics;

import java.io.IOException;
import java.io.InputStream;
import java.lang.management.ManagementFactory;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;

import javax.management.InstanceAlreadyExistsException;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author jindolk
 *
 */
public class CloudataMetricsFactory {
    public static final Log LOG = LogFactory.getLog(CloudataMetricsFactory.class.getName());

    private static final String PROPERTIES_FILE = "/cloudata-metrics.properties";

    private static CloudataMetricsFactory factory;

    //key -> value
    private Map<String, String> metricsAttributes = new HashMap<String, String>();

    private CloudataMetricsFactory() {
    }

    public static synchronized CloudataMetricsFactory getFactory() {
        if (factory == null) {
            factory = new CloudataMetricsFactory();
            try {
                factory.setAttributes();
            } catch (IOException e) {
                LOG.error(e);
            }
        }

        return factory;
    }

    public String getAttribute(String key) {
        return metricsAttributes.get(key);
    }

    public String[] getAttributeNames() {
        String[] result = new String[metricsAttributes.size()];
        int i = 0;
        // for (String attributeName : attributeMap.keySet()) {
        Iterator it = metricsAttributes.keySet().iterator();
        while (it.hasNext()) {
            result[i++] = (String) it.next();
        }
        return result;
    }

    public CloudataMetricsContext getContext(String metricsName, String contextName) {
        String contextClassName = metricsAttributes.get(contextName + ".context");

        if (contextClassName == null) {
            LOG.warn("No context class info for " + contextName + ", check [" + contextName
                    + ".context] property in conf/cloudata-metrics.properties");
            contextClassName = DummyMetricContext.class.getName();
        }
        CloudataMetricsContext context;

        try {
            context = (CloudataMetricsContext) Class.forName(contextClassName).newInstance();
        } catch (Exception e) {
            LOG.warn("Can't make context object for " + contextName + ", check [" + contextName
                    + ".context] property in conf/cloudata-metrics.properties, " + e.getMessage());
            context = new DummyMetricContext();
        }

        LOG.info(metricsName + "," + contextName + " load:" + context.getClass());
        context.setMetricsName(metricsName, contextName);
        if (context.isMonitoring()) {
            context.startMonitoring();
        }

        return context;
    }

    public ObjectName registerMBean(final String serviceName, final String nameName, final Object theMbean) {
        final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
        ObjectName name = getMBeanName(serviceName, nameName);
        try {
            mbs.registerMBean(theMbean, name);
            return name;
        } catch (InstanceAlreadyExistsException ie) {
            // Ignore if instance already exists
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public void unregisterMBean(ObjectName mbeanName) {
        final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
        if (mbeanName == null)
            return;
        try {
            mbs.unregisterMBean(mbeanName);
        } catch (InstanceNotFoundException e) {
            // ignore
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private ObjectName getMBeanName(final String serviceName, final String nameName) {
        ObjectName name = null;
        try {
            name = new ObjectName("org.cloudata:" + "service=" + serviceName + ",name=" + nameName);
        } catch (MalformedObjectNameException e) {
            e.printStackTrace();
        }
        return name;
    }

    private void setAttributes() throws IOException {
        InputStream is = getClass().getResourceAsStream(PROPERTIES_FILE);
        if (is != null) {
            try {
                Properties properties = new Properties();
                properties.load(is);
                Iterator it = properties.keySet().iterator();
                while (it.hasNext()) {
                    String propertyName = (String) it.next();
                    String propertyValue = properties.getProperty(propertyName);
                    metricsAttributes.put(propertyName, propertyValue);
                }
            } finally {
                is.close();
            }
        }
    }
}