fish.payara.monitoring.rest.app.handler.MBeanAttributeReadHandler Maven / Gradle / Ivy

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 * Copyright (c) [2016-2019] Payara Foundation and/or its affiliates. All rights reserved.
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 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://github.com/payara/Payara/blob/master/LICENSE.txt
 * See the License for the specific
 * language governing permissions and limitations under the License.
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 * file and include the License file at glassfish/legal/LICENSE.txt.
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 * GPL Classpath Exception:
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 * exception as provided by the Payara Foundation in the GPL Version 2 section of the License
 * file that accompanied this code.
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package fish.payara.monitoring.rest.app.handler;

import fish.payara.monitoring.rest.app.RestMonitoringAppResponseToken;
import fish.payara.monitoring.rest.app.MBeanServerDelegate;
import fish.payara.monitoring.rest.app.processor.ProcessorFactory;
import fish.payara.monitoring.rest.app.processor.TypeProcessor;
import javax.inject.Singleton;
import javax.json.Json;
import javax.json.JsonException;
import javax.json.JsonObject;
import javax.json.JsonObjectBuilder;
import javax.json.JsonValue;
import javax.management.AttributeNotFoundException;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanException;
import javax.management.MalformedObjectNameException;
import javax.management.ReflectionException;
import javax.ws.rs.core.Response;

/**
 *
 * @author Fraser Savage
 */
public class MBeanAttributeReadHandler extends ReadHandler {

    private final String mbeanname;
    private final String attributename;

    /**
     * Creates an instance of MBeanAttributeReadHandler, which handles MBean
     * attribute read requests.
     * 
     * @param delegate The {@link MBeanServerDelegate} to get information from.
     * @param mbeanname The {@link ObjectName} of the MBean to get information from.
     * @param attributename The name of the MBean attribute to get values for.
     */
    public MBeanAttributeReadHandler(@Singleton MBeanServerDelegate delegate, 
            String mbeanname, String attributename) {
        super(delegate);
        this.mbeanname = mbeanname;
        this.attributename = attributename;
    }

    @Override
    public JsonObject getRequestObject() {
        JsonObjectBuilder objectBuilder = Json.createObjectBuilder();
        try {
            objectBuilder.add(RestMonitoringAppResponseToken.getMbeanNameKey(), 
                    mbeanname);
            objectBuilder.add(RestMonitoringAppResponseToken.getAttributeNameKey(), 
                    attributename);
            objectBuilder.add(RestMonitoringAppResponseToken.getRequestTypeKey(), 
                    requesttype);
        } catch (JsonException ex) {
            super.setStatus(Response.Status.INTERNAL_SERVER_ERROR);
        }
        return objectBuilder.build();
    }

    @Override
    public JsonValue getValueObject() throws JsonException {
        try {
            Object attribute = delegate
                    .getMBeanAttribute(mbeanname, attributename);
            if (attribute == null) {
                return JsonValue.NULL;
            }
            TypeProcessor processor = ProcessorFactory.getTypeProcessor(attribute);
            
            return processor.processObject(attribute);
        } catch (InstanceNotFoundException | ReflectionException | MalformedObjectNameException | MBeanException | AttributeNotFoundException ex) {
            super.setStatus(Response.Status.NOT_FOUND);
            return getTraceObject(ex);
        }
    }
}