spring AbstractReflectiveMBeanInfoAssembler 源码
spring AbstractReflectiveMBeanInfoAssembler 代码
文件路径：/spring-context/src/main/java/org/springframework/jmx/export/assembler/AbstractReflectiveMBeanInfoAssembler.java
/*
* Copyright 2002-2018 the original author or authors.
*
* 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
*
* https://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.springframework.jmx.export.assembler;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import javax.management.Descriptor;
import javax.management.JMException;
import javax.management.MBeanOperationInfo;
import javax.management.MBeanParameterInfo;
import javax.management.modelmbean.ModelMBeanAttributeInfo;
import javax.management.modelmbean.ModelMBeanOperationInfo;
import org.springframework.aop.framework.AopProxyUtils;
import org.springframework.aop.support.AopUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.core.DefaultParameterNameDiscoverer;
import org.springframework.core.ParameterNameDiscoverer;
import org.springframework.jmx.support.JmxUtils;
import org.springframework.lang.Nullable;
/**
* Builds on the {@link AbstractMBeanInfoAssembler} superclass to
* add a basic algorithm for building metadata based on the
* reflective metadata of the MBean class.
*
* <p>The logic for creating MBean metadata from the reflective metadata
* is contained in this class, but this class makes no decisions as to
* which methods and properties are to be exposed. Instead, it gives
* subclasses a chance to 'vote' on each property or method through
* the {@code includeXXX} methods.
*
* <p>Subclasses are also given the opportunity to populate attribute
* and operation metadata with additional descriptors once the metadata
* is assembled through the {@code populateXXXDescriptor} methods.
*
* @author Rob Harrop
* @author Juergen Hoeller
* @author David Boden
* @since 1.2
* @see #includeOperation
* @see #includeReadAttribute
* @see #includeWriteAttribute
* @see #populateAttributeDescriptor
* @see #populateOperationDescriptor
*/
public abstract class AbstractReflectiveMBeanInfoAssembler extends AbstractMBeanInfoAssembler {
/**
* Identifies a getter method in a JMX {@link Descriptor}.
*/
protected static final String FIELD_GET_METHOD = "getMethod";
/**
* Identifies a setter method in a JMX {@link Descriptor}.
*/
protected static final String FIELD_SET_METHOD = "setMethod";
/**
* Constant identifier for the role field in a JMX {@link Descriptor}.
*/
protected static final String FIELD_ROLE = "role";
/**
* Constant identifier for the getter role field value in a JMX {@link Descriptor}.
*/
protected static final String ROLE_GETTER = "getter";
/**
* Constant identifier for the setter role field value in a JMX {@link Descriptor}.
*/
protected static final String ROLE_SETTER = "setter";
/**
* Identifies an operation (method) in a JMX {@link Descriptor}.
*/
protected static final String ROLE_OPERATION = "operation";
/**
* Constant identifier for the visibility field in a JMX {@link Descriptor}.
*/
protected static final String FIELD_VISIBILITY = "visibility";
/**
* Lowest visibility, used for operations that correspond to
* accessors or mutators for attributes.
* @see #FIELD_VISIBILITY
*/
protected static final int ATTRIBUTE_OPERATION_VISIBILITY = 4;
/**
* Constant identifier for the class field in a JMX {@link Descriptor}.
*/
protected static final String FIELD_CLASS = "class";
/**
* Constant identifier for the log field in a JMX {@link Descriptor}.
*/
protected static final String FIELD_LOG = "log";
/**
* Constant identifier for the logfile field in a JMX {@link Descriptor}.
*/
protected static final String FIELD_LOG_FILE = "logFile";
/**
* Constant identifier for the currency time limit field in a JMX {@link Descriptor}.
*/
protected static final String FIELD_CURRENCY_TIME_LIMIT = "currencyTimeLimit";
/**
* Constant identifier for the default field in a JMX {@link Descriptor}.
*/
protected static final String FIELD_DEFAULT = "default";
/**
* Constant identifier for the persistPolicy field in a JMX {@link Descriptor}.
*/
protected static final String FIELD_PERSIST_POLICY = "persistPolicy";
/**
* Constant identifier for the persistPeriod field in a JMX {@link Descriptor}.
*/
protected static final String FIELD_PERSIST_PERIOD = "persistPeriod";
/**
* Constant identifier for the persistLocation field in a JMX {@link Descriptor}.
*/
protected static final String FIELD_PERSIST_LOCATION = "persistLocation";
/**
* Constant identifier for the persistName field in a JMX {@link Descriptor}.
*/
protected static final String FIELD_PERSIST_NAME = "persistName";
/**
* Constant identifier for the displayName field in a JMX {@link Descriptor}.
*/
protected static final String FIELD_DISPLAY_NAME = "displayName";
/**
* Constant identifier for the units field in a JMX {@link Descriptor}.
*/
protected static final String FIELD_UNITS = "units";
/**
* Constant identifier for the metricType field in a JMX {@link Descriptor}.
*/
protected static final String FIELD_METRIC_TYPE = "metricType";
/**
* Constant identifier for the custom metricCategory field in a JMX {@link Descriptor}.
*/
protected static final String FIELD_METRIC_CATEGORY = "metricCategory";
/**
* Default value for the JMX field "currencyTimeLimit".
*/
@Nullable
private Integer defaultCurrencyTimeLimit;
/**
* Indicates whether strict casing is being used for attributes.
*/
private boolean useStrictCasing = true;
private boolean exposeClassDescriptor = false;
@Nullable
private ParameterNameDiscoverer parameterNameDiscoverer = new DefaultParameterNameDiscoverer();
/**
* Set the default for the JMX field "currencyTimeLimit".
* The default will usually indicate to never cache attribute values.
* <p>Default is none, not explicitly setting that field, as recommended by the
* JMX 1.2 specification. This should result in "never cache" behavior, always
* reading attribute values freshly (which corresponds to a "currencyTimeLimit"
* of {@code -1} in JMX 1.2).
* <p>However, some JMX implementations (that do not follow the JMX 1.2 spec
* in that respect) might require an explicit value to be set here to get
* "never cache" behavior: for example, JBoss 3.2.x.
* <p>Note that the "currencyTimeLimit" value can also be specified on a
* managed attribute or operation. The default value will apply if not
* overridden with a "currencyTimeLimit" value {@code >= 0} there:
* a metadata "currencyTimeLimit" value of {@code -1} indicates
* to use the default; a value of {@code 0} indicates to "always cache"
* and will be translated to {@code Integer.MAX_VALUE}; a positive
* value indicates the number of cache seconds.
* @see org.springframework.jmx.export.metadata.AbstractJmxAttribute#setCurrencyTimeLimit
* @see #applyCurrencyTimeLimit(javax.management.Descriptor, int)
*/
public void setDefaultCurrencyTimeLimit(@Nullable Integer defaultCurrencyTimeLimit) {
this.defaultCurrencyTimeLimit = defaultCurrencyTimeLimit;
}
/**
* Return default value for the JMX field "currencyTimeLimit", if any.
*/
@Nullable
protected Integer getDefaultCurrencyTimeLimit() {
return this.defaultCurrencyTimeLimit;
}
/**
* Set whether to use strict casing for attributes. Enabled by default.
* <p>When using strict casing, a JavaBean property with a getter such as
* {@code getFoo()} translates to an attribute called {@code Foo}.
* With strict casing disabled, {@code getFoo()} would translate to just
* {@code foo}.
*/
public void setUseStrictCasing(boolean useStrictCasing) {
this.useStrictCasing = useStrictCasing;
}
/**
* Return whether strict casing for attributes is enabled.
*/
protected boolean isUseStrictCasing() {
return this.useStrictCasing;
}
/**
* Set whether to expose the JMX descriptor field "class" for managed operations.
* Default is "false", letting the JMX implementation determine the actual class
* through reflection.
* <p>Set this property to {@code true} for JMX implementations that
* require the "class" field to be specified, for example WebLogic's.
* In that case, Spring will expose the target class name there, in case of
* a plain bean instance or a CGLIB proxy. When encountering a JDK dynamic
* proxy, the <b>first</b> interface implemented by the proxy will be specified.
* <p><b>WARNING:</b> Review your proxy definitions when exposing a JDK dynamic
* proxy through JMX, in particular with this property turned to {@code true}:
* the specified interface list should start with your management interface in
* this case, with all other interfaces following. In general, consider exposing
* your target bean directly or a CGLIB proxy for it instead.
* @see #getClassForDescriptor(Object)
*/
public void setExposeClassDescriptor(boolean exposeClassDescriptor) {
this.exposeClassDescriptor = exposeClassDescriptor;
}
/**
* Return whether to expose the JMX descriptor field "class" for managed operations.
*/
protected boolean isExposeClassDescriptor() {
return this.exposeClassDescriptor;
}
/**
* Set the ParameterNameDiscoverer to use for resolving method parameter
* names if needed (e.g. for parameter names of MBean operation methods).
* <p>Default is a {@link DefaultParameterNameDiscoverer}.
*/
public void setParameterNameDiscoverer(@Nullable ParameterNameDiscoverer parameterNameDiscoverer) {
this.parameterNameDiscoverer = parameterNameDiscoverer;
}
/**
* Return the ParameterNameDiscoverer to use for resolving method parameter
* names if needed (may be {@code null} in order to skip parameter detection).
*/
@Nullable
protected ParameterNameDiscoverer getParameterNameDiscoverer() {
return this.parameterNameDiscoverer;
}
/**
* Iterate through all properties on the MBean class and gives subclasses
* the chance to vote on the inclusion of both the accessor and mutator.
* If a particular accessor or mutator is voted for inclusion, the appropriate
* metadata is assembled and passed to the subclass for descriptor population.
* @param managedBean the bean instance (might be an AOP proxy)
* @param beanKey the key associated with the MBean in the beans map
* of the {@code MBeanExporter}
* @return the attribute metadata
* @throws JMException in case of errors
* @see #populateAttributeDescriptor
*/
@Override
protected ModelMBeanAttributeInfo[] getAttributeInfo(Object managedBean, String beanKey) throws JMException {
PropertyDescriptor[] props = BeanUtils.getPropertyDescriptors(getClassToExpose(managedBean));
List<ModelMBeanAttributeInfo> infos = new ArrayList<>();
for (PropertyDescriptor prop : props) {
Method getter = prop.getReadMethod();
if (getter != null && getter.getDeclaringClass() == Object.class) {
continue;
}
if (getter != null && !includeReadAttribute(getter, beanKey)) {
getter = null;
}
Method setter = prop.getWriteMethod();
if (setter != null && !includeWriteAttribute(setter, beanKey)) {
setter = null;
}
if (getter != null || setter != null) {
// If both getter and setter are null, then this does not need exposing.
String attrName = JmxUtils.getAttributeName(prop, isUseStrictCasing());
String description = getAttributeDescription(prop, beanKey);
ModelMBeanAttributeInfo info = new ModelMBeanAttributeInfo(attrName, description, getter, setter);
Descriptor desc = info.getDescriptor();
if (getter != null) {
desc.setField(FIELD_GET_METHOD, getter.getName());
}
if (setter != null) {
desc.setField(FIELD_SET_METHOD, setter.getName());
}
populateAttributeDescriptor(desc, getter, setter, beanKey);
info.setDescriptor(desc);
infos.add(info);
}
}
return infos.toArray(new ModelMBeanAttributeInfo[0]);
}
/**
* Iterate through all methods on the MBean class and gives subclasses the chance
* to vote on their inclusion. If a particular method corresponds to the accessor
* or mutator of an attribute that is included in the management interface, then
* the corresponding operation is exposed with the "role" descriptor
* field set to the appropriate value.
* @param managedBean the bean instance (might be an AOP proxy)
* @param beanKey the key associated with the MBean in the beans map
* of the {@code MBeanExporter}
* @return the operation metadata
* @see #populateOperationDescriptor
*/
@Override
protected ModelMBeanOperationInfo[] getOperationInfo(Object managedBean, String beanKey) {
Method[] methods = getClassToExpose(managedBean).getMethods();
List<ModelMBeanOperationInfo> infos = new ArrayList<>();
for (Method method : methods) {
if (method.isSynthetic()) {
continue;
}
if (Object.class == method.getDeclaringClass()) {
continue;
}
ModelMBeanOperationInfo info = null;
PropertyDescriptor pd = BeanUtils.findPropertyForMethod(method);
if (pd != null && ((method.equals(pd.getReadMethod()) && includeReadAttribute(method, beanKey)) ||
(method.equals(pd.getWriteMethod()) && includeWriteAttribute(method, beanKey)))) {
// Attributes need to have their methods exposed as
// operations to the JMX server as well.
info = createModelMBeanOperationInfo(method, pd.getName(), beanKey);
Descriptor desc = info.getDescriptor();
if (method.equals(pd.getReadMethod())) {
desc.setField(FIELD_ROLE, ROLE_GETTER);
}
else {
desc.setField(FIELD_ROLE, ROLE_SETTER);
}
desc.setField(FIELD_VISIBILITY, ATTRIBUTE_OPERATION_VISIBILITY);
if (isExposeClassDescriptor()) {
desc.setField(FIELD_CLASS, getClassForDescriptor(managedBean).getName());
}
info.setDescriptor(desc);
}
// allow getters and setters to be marked as operations directly
if (info == null && includeOperation(method, beanKey)) {
info = createModelMBeanOperationInfo(method, method.getName(), beanKey);
Descriptor desc = info.getDescriptor();
desc.setField(FIELD_ROLE, ROLE_OPERATION);
if (isExposeClassDescriptor()) {
desc.setField(FIELD_CLASS, getClassForDescriptor(managedBean).getName());
}
populateOperationDescriptor(desc, method, beanKey);
info.setDescriptor(desc);
}
if (info != null) {
infos.add(info);
}
}
return infos.toArray(new ModelMBeanOperationInfo[0]);
}
/**
* Creates an instance of {@code ModelMBeanOperationInfo} for the
* given method. Populates the parameter info for the operation.
* @param method the {@code Method} to create a {@code ModelMBeanOperationInfo} for
* @param name the logical name for the operation (method name or property name);
* not used by the default implementation but possibly by subclasses
* @param beanKey the key associated with the MBean in the beans map
* of the {@code MBeanExporter}
* @return the {@code ModelMBeanOperationInfo}
*/
protected ModelMBeanOperationInfo createModelMBeanOperationInfo(Method method, String name, String beanKey) {
MBeanParameterInfo[] params = getOperationParameters(method, beanKey);
if (params.length == 0) {
return new ModelMBeanOperationInfo(getOperationDescription(method, beanKey), method);
}
else {
return new ModelMBeanOperationInfo(method.getName(),
getOperationDescription(method, beanKey),
getOperationParameters(method, beanKey),
method.getReturnType().getName(),
MBeanOperationInfo.UNKNOWN);
}
}
/**
* Return the class to be used for the JMX descriptor field "class".
* Only applied when the "exposeClassDescriptor" property is "true".
* <p>The default implementation returns the first implemented interface
* for a JDK proxy, and the target class else.
* @param managedBean the bean instance (might be an AOP proxy)
* @return the class to expose in the descriptor field "class"
* @see #setExposeClassDescriptor
* @see #getClassToExpose(Class)
* @see org.springframework.aop.framework.AopProxyUtils#proxiedUserInterfaces(Object)
*/
protected Class<?> getClassForDescriptor(Object managedBean) {
if (AopUtils.isJdkDynamicProxy(managedBean)) {
return AopProxyUtils.proxiedUserInterfaces(managedBean)[0];
}
return getClassToExpose(managedBean);
}
/**
* Allows subclasses to vote on the inclusion of a particular attribute accessor.
* @param method the accessor {@code Method}
* @param beanKey the key associated with the MBean in the beans map
* of the {@code MBeanExporter}
* @return {@code true} if the accessor should be included in the management interface,
* otherwise {@code false}
*/
protected abstract boolean includeReadAttribute(Method method, String beanKey);
/**
* Allows subclasses to vote on the inclusion of a particular attribute mutator.
* @param method the mutator {@code Method}.
* @param beanKey the key associated with the MBean in the beans map
* of the {@code MBeanExporter}
* @return {@code true} if the mutator should be included in the management interface,
* otherwise {@code false}
*/
protected abstract boolean includeWriteAttribute(Method method, String beanKey);
/**
* Allows subclasses to vote on the inclusion of a particular operation.
* @param method the operation method
* @param beanKey the key associated with the MBean in the beans map
* of the {@code MBeanExporter}
* @return whether the operation should be included in the management interface
*/
protected abstract boolean includeOperation(Method method, String beanKey);
/**
* Get the description for a particular attribute.
* <p>The default implementation returns a description for the operation
* that is the name of corresponding {@code Method}.
* @param propertyDescriptor the PropertyDescriptor for the attribute
* @param beanKey the key associated with the MBean in the beans map
* of the {@code MBeanExporter}
* @return the description for the attribute
*/
protected String getAttributeDescription(PropertyDescriptor propertyDescriptor, String beanKey) {
return propertyDescriptor.getDisplayName();
}
/**
* Get the description for a particular operation.
* <p>The default implementation returns a description for the operation
* that is the name of corresponding {@code Method}.
* @param method the operation method
* @param beanKey the key associated with the MBean in the beans map
* of the {@code MBeanExporter}
* @return the description for the operation
*/
protected String getOperationDescription(Method method, String beanKey) {
return method.getName();
}
/**
* Create parameter info for the given method.
* <p>The default implementation returns an empty array of {@code MBeanParameterInfo}.
* @param method the {@code Method} to get the parameter information for
* @param beanKey the key associated with the MBean in the beans map
* of the {@code MBeanExporter}
* @return the {@code MBeanParameterInfo} array
*/
protected MBeanParameterInfo[] getOperationParameters(Method method, String beanKey) {
ParameterNameDiscoverer paramNameDiscoverer = getParameterNameDiscoverer();
String[] paramNames = (paramNameDiscoverer != null ? paramNameDiscoverer.getParameterNames(method) : null);
if (paramNames == null) {
return new MBeanParameterInfo[0];
}
MBeanParameterInfo[] info = new MBeanParameterInfo[paramNames.length];
Class<?>[] typeParameters = method.getParameterTypes();
for (int i = 0; i < info.length; i++) {
info[i] = new MBeanParameterInfo(paramNames[i], typeParameters[i].getName(), paramNames[i]);
}
return info;
}
/**
* Allows subclasses to add extra fields to the {@code Descriptor} for an MBean.
* <p>The default implementation sets the {@code currencyTimeLimit} field to
* the specified "defaultCurrencyTimeLimit", if any (by default none).
* @param descriptor the {@code Descriptor} for the MBean resource.
* @param managedBean the bean instance (might be an AOP proxy)
* @param beanKey the key associated with the MBean in the beans map
* of the {@code MBeanExporter}
* @see #setDefaultCurrencyTimeLimit(Integer)
* @see #applyDefaultCurrencyTimeLimit(javax.management.Descriptor)
*/
@Override
protected void populateMBeanDescriptor(Descriptor descriptor, Object managedBean, String beanKey) {
applyDefaultCurrencyTimeLimit(descriptor);
}
/**
* Allows subclasses to add extra fields to the {@code Descriptor} for a
* particular attribute.
* <p>The default implementation sets the {@code currencyTimeLimit} field to
* the specified "defaultCurrencyTimeLimit", if any (by default none).
* @param desc the attribute descriptor
* @param getter the accessor method for the attribute
* @param setter the mutator method for the attribute
* @param beanKey the key associated with the MBean in the beans map
* of the {@code MBeanExporter}
* @see #setDefaultCurrencyTimeLimit(Integer)
* @see #applyDefaultCurrencyTimeLimit(javax.management.Descriptor)
*/
protected void populateAttributeDescriptor(
Descriptor desc, @Nullable Method getter, @Nullable Method setter, String beanKey) {
applyDefaultCurrencyTimeLimit(desc);
}
/**
* Allows subclasses to add extra fields to the {@code Descriptor} for a
* particular operation.
* <p>The default implementation sets the {@code currencyTimeLimit} field to
* the specified "defaultCurrencyTimeLimit", if any (by default none).
* @param desc the operation descriptor
* @param method the method corresponding to the operation
* @param beanKey the key associated with the MBean in the beans map
* of the {@code MBeanExporter}
* @see #setDefaultCurrencyTimeLimit(Integer)
* @see #applyDefaultCurrencyTimeLimit(javax.management.Descriptor)
*/
protected void populateOperationDescriptor(Descriptor desc, Method method, String beanKey) {
applyDefaultCurrencyTimeLimit(desc);
}
/**
* Set the {@code currencyTimeLimit} field to the specified
* "defaultCurrencyTimeLimit", if any (by default none).
* @param desc the JMX attribute or operation descriptor
* @see #setDefaultCurrencyTimeLimit(Integer)
*/
protected final void applyDefaultCurrencyTimeLimit(Descriptor desc) {
if (getDefaultCurrencyTimeLimit() != null) {
desc.setField(FIELD_CURRENCY_TIME_LIMIT, getDefaultCurrencyTimeLimit().toString());
}
}
/**
* Apply the given JMX "currencyTimeLimit" value to the given descriptor.
* <p>The default implementation sets a value {@code >0} as-is (as number of cache seconds),
* turns a value of {@code 0} into {@code Integer.MAX_VALUE} ("always cache")
* and sets the "defaultCurrencyTimeLimit" (if any, indicating "never cache") in case of
* a value {@code <0}. This follows the recommendation in the JMX 1.2 specification.
* @param desc the JMX attribute or operation descriptor
* @param currencyTimeLimit the "currencyTimeLimit" value to apply
* @see #setDefaultCurrencyTimeLimit(Integer)
* @see #applyDefaultCurrencyTimeLimit(javax.management.Descriptor)
*/
protected void applyCurrencyTimeLimit(Descriptor desc, int currencyTimeLimit) {
if (currencyTimeLimit > 0) {
// number of cache seconds
desc.setField(FIELD_CURRENCY_TIME_LIMIT, Integer.toString(currencyTimeLimit));
}
else if (currencyTimeLimit == 0) {
// "always cache"
desc.setField(FIELD_CURRENCY_TIME_LIMIT, Integer.toString(Integer.MAX_VALUE));
}
else {
// "never cache"
applyDefaultCurrencyTimeLimit(desc);
}
}
}
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