com.proofpoint.jmx.JmxInspector.java Source code

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Here is the source code for com.proofpoint.jmx.JmxInspector.java

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/*
 * Copyright 2010 Proofpoint, Inc.
 *
 * Licensed 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 com.proofpoint.jmx;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ImmutableSortedSet;
import com.google.common.collect.Iterators;
import com.google.common.collect.Multimap;
import com.google.inject.Inject;
import com.google.inject.Injector;
import org.weakref.jmx.Managed;

import javax.management.MBeanServer;
import javax.management.ObjectInstance;
import java.lang.management.ManagementFactory;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;

public class JmxInspector implements Iterable<JmxInspector.InspectorRecord> {
    private final ImmutableSortedSet<InspectorRecord> inspectorRecords;

    public enum Types {
        ATTRIBUTE, ACTION
    }

    public static class InspectorRecord implements Comparable<InspectorRecord> {
        public final String className;
        public final String objectName;
        public final String description;
        public final Types type;

        @Override
        public int hashCode() {
            return className.hashCode();
        }

        @Override
        public int compareTo(InspectorRecord rhs) {
            int diff = objectName.compareTo(rhs.objectName);
            return (diff != 0) ? diff : className.compareTo(rhs.className);
        }

        private InspectorRecord(String className, String objectName, String description, Types type) {
            this.className = className;
            this.objectName = objectName;
            this.description = description;
            this.type = type;
        }
    }

    @Inject
    public JmxInspector(Injector injector) throws Exception {
        MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
        Set<ObjectInstance> instances = mBeanServer.queryMBeans(null, null);
        Multimap<String, String> nameMap = ArrayListMultimap.create();
        for (ObjectInstance i : instances) {
            nameMap.put(i.getClassName(), i.getObjectName().getCanonicalName());
        }

        ImmutableSortedSet.Builder<InspectorRecord> builder = ImmutableSortedSet.naturalOrder();
        GuiceInjectorIterator injectorIterator = new GuiceInjectorIterator(injector);
        for (Class<?> clazz : injectorIterator) {
            addConfig(nameMap, clazz, builder);
        }

        inspectorRecords = builder.build();
    }

    @Override
    public Iterator<InspectorRecord> iterator() {
        return Iterators.unmodifiableIterator(inspectorRecords.iterator());
    }

    private void addConfig(Multimap<String, String> nameMap, Class<?> clazz,
            ImmutableSortedSet.Builder<InspectorRecord> builder)
            throws InvocationTargetException, IllegalAccessException {
        Collection<String> thisNameList = nameMap.get(clazz.getName());
        if (thisNameList != null) {
            for (Method method : clazz.getMethods()) {
                Managed configAnnotation = method.getAnnotation(Managed.class);
                if (configAnnotation != null) {
                    for (String thisName : thisNameList) {
                        builder.add(new InspectorRecord(thisName, method.getName(), configAnnotation.description(),
                                getType(method)));
                    }
                }
            }
        }
    }

    private Types getType(Method method) {
        if (method.getReturnType() == Void.TYPE) {
            return Types.ACTION;
        }

        if (method.getParameterTypes().length > 0) {
            return Types.ACTION;
        } else {
            return Types.ATTRIBUTE;
        }
    }
}