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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.facebook.airlift.jmx;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import javax.management.Attribute;
import javax.management.Descriptor;
import javax.management.JMException;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanInfo;
import javax.management.MBeanOperationInfo;
import javax.management.MBeanParameterInfo;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import static com.google.common.io.ByteStreams.nullOutputStream;
@JsonPropertyOrder({"objectName", "className", "description", "descriptor", "attributes", "operations"})
public class MBeanRepresentation
{
private final ObjectName objectName;
private final String className;
private final String description;
private final Map descriptor;
private final List attributes;
private final List operations;
public MBeanRepresentation(MBeanServer mbeanServer, ObjectName objectName, ObjectMapper objectMapper)
throws JMException
{
this.objectName = objectName;
MBeanInfo mbeanInfo = mbeanServer.getMBeanInfo(objectName);
className = mbeanInfo.getClassName();
description = mbeanInfo.getDescription();
descriptor = toMap(mbeanInfo.getDescriptor());
//
// Attributes
//
LinkedHashMap attributeInfos = new LinkedHashMap<>();
for (MBeanAttributeInfo attributeInfo : mbeanInfo.getAttributes()) {
attributeInfos.put(attributeInfo.getName(), attributeInfo);
}
String[] attributeNames = attributeInfos.keySet().toArray(new String[0]);
ImmutableList.Builder attributes = ImmutableList.builder();
for (Attribute attribute : mbeanServer.getAttributes(objectName, attributeNames).asList()) {
String attributeName = attribute.getName();
// use remove so we only include one value for each attribute
MBeanAttributeInfo attributeInfo = attributeInfos.remove(attributeName);
if (attributeInfo == null) {
// unknown extra attribute, could have been added after MBeanInfo was fetched
continue;
}
Object attributeValue = attribute.getValue();
AttributeRepresentation attributeRepresentation = new AttributeRepresentation(attributeInfo, attributeValue, objectMapper);
attributes.add(attributeRepresentation);
}
this.attributes = attributes.build();
//
// Operations
//
ImmutableList.Builder operations = ImmutableList.builder();
for (MBeanOperationInfo operationInfo : mbeanInfo.getOperations()) {
operations.add(new OperationRepresentation(operationInfo));
}
this.operations = operations.build();
}
@JsonProperty
public ObjectName getObjectName()
{
return objectName;
}
@JsonProperty
public String getClassName()
{
return className;
}
@JsonProperty
public String getDescription()
{
return description;
}
@JsonProperty
public Map getDescriptor()
{
return descriptor;
}
@JsonProperty
public List getAttributes()
{
return attributes;
}
@JsonProperty
public List getOperations()
{
return operations;
}
@JsonPropertyOrder({"name", "type", "description", "readable", "writable", "descriptor", "value"})
public static class AttributeRepresentation
{
private final String name;
private final String type;
private final String description;
private final boolean readable;
private final boolean writable;
private final Map descriptor;
private final Object value;
private AttributeRepresentation(MBeanAttributeInfo attributeInfo, Object value, ObjectMapper objectMapper)
{
if (canSerialize(value, objectMapper)) {
this.value = value;
readable = attributeInfo.isReadable();
writable = attributeInfo.isWritable();
}
else {
this.value = null;
readable = false;
writable = false;
}
name = attributeInfo.getName();
type = attributeInfo.getType();
description = attributeInfo.getDescription();
descriptor = toMap(attributeInfo.getDescriptor());
}
private static boolean canSerialize(Object value, ObjectMapper objectMapper)
{
if (value == null) {
return true;
}
// Jackson is not smart enough in the canSerialize check (especially with collections) so
// the only good way to check if something can be serialized it to serialize it
// We could save off the serialized data but it looks wrong when pretty printing is enabled
try {
objectMapper.writeValue(nullOutputStream(), value);
return true;
}
catch (Exception e) {
return false;
}
}
@JsonProperty
public String getName()
{
return name;
}
@JsonProperty
public String getType()
{
return type;
}
@JsonProperty
public String getDescription()
{
return description;
}
@JsonProperty
public boolean isReadable()
{
return readable;
}
@JsonProperty
public boolean isWritable()
{
return writable;
}
@JsonProperty
public Map getDescriptor()
{
return descriptor;
}
@JsonProperty
public Object getValue()
{
return value;
}
}
@JsonPropertyOrder({"name", "impact", "returnType", "descriptor", "parameters"})
public static class OperationRepresentation
{
private final String name;
private final int impact;
private final String returnType;
private final List parameters;
private final Map descriptor;
private OperationRepresentation(MBeanOperationInfo operationInfo)
{
name = operationInfo.getName();
impact = operationInfo.getImpact();
returnType = operationInfo.getReturnType();
ImmutableList.Builder parameters = ImmutableList.builder();
for (MBeanParameterInfo parameterInfo : operationInfo.getSignature()) {
parameters.add(new ParameterRepresentation(parameterInfo));
}
this.parameters = parameters.build();
descriptor = toMap(operationInfo.getDescriptor());
}
@JsonProperty
public String getName()
{
return name;
}
@JsonProperty
public int getImpact()
{
return impact;
}
@JsonProperty
public String getReturnType()
{
return returnType;
}
@JsonProperty
public List getParameters()
{
return parameters;
}
@JsonProperty
public Map getDescriptor()
{
return descriptor;
}
}
@JsonPropertyOrder({"name", "type", "description", "descriptor"})
public static class ParameterRepresentation
{
private final String name;
private final String description;
private final String type;
private final Map descriptor;
public ParameterRepresentation(MBeanParameterInfo parameterInfo)
{
name = parameterInfo.getName();
description = parameterInfo.getDescription();
type = parameterInfo.getType();
descriptor = toMap(parameterInfo.getDescriptor());
}
@JsonProperty
public String getName()
{
return name;
}
@JsonProperty
public String getDescription()
{
return description;
}
@JsonProperty
public String getType()
{
return type;
}
@JsonProperty
public Map getDescriptor()
{
return descriptor;
}
}
private static Map toMap(Descriptor descriptor)
{
ImmutableMap.Builder builder = ImmutableMap.builder();
for (String fieldName : descriptor.getFieldNames()) {
Object fieldValue = descriptor.getFieldValue(fieldName);
if (fieldValue != null) {
if (fieldValue instanceof Descriptor) {
fieldValue = toMap((Descriptor) fieldValue);
}
builder.put(fieldName, fieldValue);
}
}
ImmutableMap map = builder.build();
if (!map.isEmpty()) {
return map;
}
else {
return null;
}
}
}
