org.apache.streams.jackson.MemoryUsageDeserializer.java Source code

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Here is the source code for org.apache.streams.jackson.MemoryUsageDeserializer.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
 *
 *   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.apache.streams.jackson;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import org.apache.streams.pojo.json.MemoryUsageBroadcast;
import org.slf4j.Logger;

import javax.management.MBeanAttributeInfo;
import javax.management.MBeanInfo;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import javax.management.openmbean.CompositeDataSupport;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.util.Arrays;

public class MemoryUsageDeserializer extends JsonDeserializer<MemoryUsageBroadcast> {
    private static final Logger LOGGER = org.slf4j.LoggerFactory.getLogger(MemoryUsageDeserializer.class);

    public MemoryUsageDeserializer() {

    }

    @Override
    public MemoryUsageBroadcast deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
            throws IOException, JsonProcessingException {
        try {
            MBeanServer server = ManagementFactory.getPlatformMBeanServer();

            MemoryUsageBroadcast memoryUsageBroadcast = new MemoryUsageBroadcast();
            JsonNode attributes = jsonParser.getCodec().readTree(jsonParser);

            ObjectName name = new ObjectName(attributes.get("canonicalName").asText());
            MBeanInfo info = server.getMBeanInfo(name);
            memoryUsageBroadcast.setName(name.toString());

            for (MBeanAttributeInfo attribute : Arrays.asList(info.getAttributes())) {
                switch (attribute.getName()) {
                case "Verbose":
                    memoryUsageBroadcast.setVerbose((boolean) server.getAttribute(name, attribute.getName()));
                    break;
                case "ObjectPendingFinalizationCount":
                    memoryUsageBroadcast.setObjectPendingFinalizationCount(
                            Long.parseLong(server.getAttribute(name, attribute.getName()).toString()));
                    break;
                case "HeapMemoryUsage":
                    memoryUsageBroadcast.setHeapMemoryUsage(
                            (Long) ((CompositeDataSupport) server.getAttribute(name, attribute.getName()))
                                    .get("used"));
                    break;
                case "NonHeapMemoryUsage":
                    memoryUsageBroadcast.setNonHeapMemoryUsage(
                            (Long) ((CompositeDataSupport) server.getAttribute(name, attribute.getName()))
                                    .get("used"));
                    break;
                }
            }

            return memoryUsageBroadcast;
        } catch (Exception e) {
            LOGGER.error("Exception trying to deserialize MemoryUsageDeserializer object: {}", e);
            return null;
        }
    }
}