org.infinispan.jmx.ResourceDMBean Maven / Gradle / Ivy
package org.infinispan.jmx;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import javax.management.Attribute;
import javax.management.AttributeList;
import javax.management.AttributeNotFoundException;
import javax.management.DynamicMBean;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanException;
import javax.management.MBeanInfo;
import javax.management.MBeanOperationInfo;
import javax.management.MBeanParameterInfo;
import javax.management.MBeanRegistration;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import javax.management.ServiceNotFoundException;
import org.infinispan.commons.CacheException;
import org.infinispan.commons.util.ReflectionUtil;
import org.infinispan.factories.impl.MBeanMetadata;
import org.infinispan.jmx.annotations.MBean;
import org.infinispan.jmx.annotations.ManagedOperation;
import org.infinispan.util.logging.Log;
import org.infinispan.util.logging.LogFactory;
/**
* This class was copied from JGroups and adapted.
* The original JGroup's ResourceDMBean logic has been modified so that invoke() method checks whether the operation
* called has been exposed as a {@link ManagedOperation}, otherwise the call fails. JGroups deviated from this logic on
* purpose because they liked the fact that you could expose all class methods by simply annotating class with {@link
* MBean} annotation.
*
* @author [email protected]
* @author Galder Zamarreño
* @since 4.0
*/
public final class ResourceDMBean implements DynamicMBean, MBeanRegistration {
private static final Log log = LogFactory.getLog(ResourceDMBean.class);
private final Object obj;
private final Class objectClass;
private final MBeanOperationInfo[] opInfos;
private final String[] opNames;
private final MBeanAttributeInfo[] attInfos;
private final Map atts = new HashMap<>(2);
private final String mbeanName;
private final String description;
/**
* This is the name under which this MBean was registered.
*/
private ObjectName objectName;
private static final Map FIELD_CACHE = new ConcurrentHashMap<>(64);
private static final Map METHOD_CACHE = new ConcurrentHashMap<>(64);
ResourceDMBean(Object instance, MBeanMetadata mBeanMetadata, String componentName) {
if (instance == null) {
throw new NullPointerException("Cannot make an MBean wrapper for null instance");
}
this.obj = instance;
this.objectClass = instance.getClass();
if (mBeanMetadata.getJmxObjectName() != null) {
mbeanName = mBeanMetadata.getJmxObjectName();
} else if (componentName != null) {
mbeanName = componentName;
} else {
throw new IllegalArgumentException("MBean.objectName and componentName cannot be both null");
}
this.description = mBeanMetadata.getDescription();
// Load up all fields.
int i = 0;
attInfos = new MBeanAttributeInfo[mBeanMetadata.getAttributes().size()];
for (MBeanMetadata.AttributeMetadata attributeMetadata : mBeanMetadata.getAttributes()) {
String attributeName = attributeMetadata.getName();
if (atts.containsKey(attributeName)) {
throw new IllegalArgumentException("Component " + objectClass.getName()
+ " metadata has a duplicate attribute: " + attributeName);
}
InvokableMBeanAttributeInfo info = toJmxInfo(attributeMetadata);
atts.put(attributeName, info);
attInfos[i++] = info.attributeInfo;
if (log.isTraceEnabled())
log.tracef("Attribute %s [r=%b,w=%b,is=%b,type=%s]", attributeName,
info.attributeInfo.isReadable(), info.attributeInfo.isWritable(),
info.attributeInfo.isIs(), info.attributeInfo.getType());
}
// And operations
opInfos = new MBeanOperationInfo[mBeanMetadata.getOperations().size()];
opNames = new String[opInfos.length];
i = 0;
for (MBeanMetadata.OperationMetadata operation : mBeanMetadata.getOperations()) {
opNames[i] = operation.getOperationName();
MBeanOperationInfo op = toJmxInfo(operation);
opInfos[i++] = op;
if (log.isTraceEnabled()) log.tracef("Operation %s %s", op.getReturnType(), op.getName());
}
}
/**
* The name assigned via {@link MBean#objectName} or generated based on default rules if missing.
*/
String getMBeanName() {
return mbeanName;
}
/**
* The ObjectName. Only available if the MBean was registered.
*/
public ObjectName getObjectName() {
return objectName;
}
private static Field findField(Class objectClass, String fieldName) {
String key = objectClass.getName() + "#" + fieldName;
Field f = FIELD_CACHE.get(key);
if (f == null) {
f = ReflectionUtil.getField(fieldName, objectClass);
if (f != null) FIELD_CACHE.put(key, f);
}
return f;
}
private static Method findSetter(Class objectClass, String fieldName) {
String key = objectClass.getName() + "#s#" + fieldName;
Method m = METHOD_CACHE.get(key);
if (m == null) {
m = ReflectionUtil.findSetterForField(objectClass, fieldName);
if (m != null) METHOD_CACHE.put(key, m);
}
return m;
}
private static Method findGetter(Class objectClass, String fieldName) {
String key = objectClass.getName() + "#g#" + fieldName;
Method m = METHOD_CACHE.get(key);
if (m == null) {
m = ReflectionUtil.findGetterForField(objectClass, fieldName);
if (m != null) METHOD_CACHE.put(key, m);
}
return m;
}
private InvokableMBeanAttributeInfo toJmxInfo(MBeanMetadata.AttributeMetadata attributeMetadata) {
if (!attributeMetadata.isUseSetter()) {
Field field = findField(objectClass, attributeMetadata.getName());
if (field != null) {
return new InvokableFieldBasedMBeanAttributeInfo(attributeMetadata.getName(), attributeMetadata.getType(),
attributeMetadata.getDescription(), true, attributeMetadata.isWritable(),
attributeMetadata.isIs(), field);
}
}
Method setter = null;
Method getter = null;
try {
setter = attributeMetadata.isWritable() ? findSetter(objectClass, attributeMetadata.getName()) : null;
getter = findGetter(objectClass, attributeMetadata.getName());
} catch (NoClassDefFoundError ignored) {
// missing dependency
}
assert getter != null : attributeMetadata;
return new InvokableSetterBasedMBeanAttributeInfo(attributeMetadata.getName(), attributeMetadata.getType(),
attributeMetadata.getDescription(), true, attributeMetadata.isWritable(),
attributeMetadata.isIs(), getter, setter);
}
private MBeanOperationInfo toJmxInfo(MBeanMetadata.OperationMetadata operationMetadata) {
MBeanMetadata.OperationParameterMetadata[] parameters = operationMetadata.getMethodParameters();
MBeanParameterInfo[] params = new MBeanParameterInfo[parameters.length];
for (int i = 0; i < parameters.length; i++) {
params[i] = new MBeanParameterInfo(parameters[i].getName(), parameters[i].getType(), parameters[i].getDescription());
}
return new MBeanOperationInfo(operationMetadata.getMethodName(), operationMetadata.getDescription(),
params, operationMetadata.getReturnType(), MBeanOperationInfo.UNKNOWN);
}
@Override
public MBeanInfo getMBeanInfo() {
return new MBeanInfo(objectClass.getName(), description, attInfos, null, opInfos, null);
}
@Override
public Object getAttribute(String name) throws AttributeNotFoundException {
if (name == null || name.isEmpty())
throw new NullPointerException("Invalid attribute requested " + name);
Attribute attr = getNamedAttribute(name);
if (attr == null) {
throw new AttributeNotFoundException("Unknown attribute '" + name
+ "'. Known attributes names are: " + atts.keySet());
}
return attr.getValue();
}
@Override
public synchronized void setAttribute(Attribute attribute) throws AttributeNotFoundException, MBeanException {
if (attribute == null || attribute.getName() == null)
throw new NullPointerException("Invalid attribute requested " + attribute);
setNamedAttribute(attribute);
}
@Override
public synchronized AttributeList getAttributes(String[] names) {
AttributeList al = new AttributeList();
for (String name : names) {
Attribute attr = getNamedAttribute(name);
if (attr != null) {
al.add(attr);
} else {
log.couldNotFindAttribute(name);
//todo [anistor] is it ok to ignore missing attributes ?
}
}
return al;
}
@Override
public synchronized AttributeList setAttributes(AttributeList list) {
AttributeList results = new AttributeList();
for (Object aList : list) {
Attribute attr = (Attribute) aList;
try {
setNamedAttribute(attr);
results.add(attr);
} catch (Exception e) {
log.failedToUpdateAttribute(attr.getName(), attr.getValue());
}
}
return results;
}
@Override
public Object invoke(String name, Object[] args, String[] sig) throws MBeanException {
if (log.isDebugEnabled()) {
log.debugf("Invoke method called on %s", name);
}
MBeanOperationInfo opInfo = null;
for (int i = 0; i < opNames.length; i++) {
if (opNames[i].equals(name)) {
opInfo = opInfos[i];
break;
}
}
if (opInfo == null) {
final String msg = "Operation " + name + " not amongst operations in " + Arrays.toString(opInfos);
throw new MBeanException(new ServiceNotFoundException(msg), msg);
}
// Argument type transformation according to signatures
for (int i = 0; i < sig.length; i++) {
// Some clients (e.g. RHQ) will pass the arguments as java.lang.String but we need some fields to be numbers
if (args[i] != null) {
if (log.isDebugEnabled())
log.debugf("Argument value before transformation: %s and its class: %s. " +
"For method.invoke we need it to be class: %s", args[i], args[i].getClass(), sig[i]);
if (sig[i].equals(int.class.getName()) || sig[i].equals(Integer.class.getName())) {
if (args[i].getClass() != Integer.class && args[i].getClass() != int.class)
args[i] = Integer.parseInt((String) args[i]);
} else if (sig[i].equals(Long.class.getName()) || sig[i].equals(long.class.getName())) {
if (args[i].getClass() != Long.class && args[i].getClass() != long.class)
args[i] = Long.parseLong((String) args[i]);
}
}
}
try {
Class[] classes = new Class[sig.length];
for (int i = 0; i < classes.length; i++) {
classes[i] = ReflectionUtil.getClassForName(sig[i], null);
}
Method method = objectClass.getMethod(opInfo.getName(), classes);
return method.invoke(obj, args);
} catch (Exception e) {
throw new MBeanException(new Exception(getRootCause(e)));
}
}
private static Throwable getRootCause(Throwable throwable) {
Throwable cause;
while ((cause = throwable.getCause()) != null) {
throwable = cause;
}
return throwable;
}
private Attribute getNamedAttribute(String name) {
Attribute result = null;
InvokableMBeanAttributeInfo i = atts.get(name);
if (i == null && !name.isEmpty()) {
// This is legacy. Earlier versions used an upper-case starting letter for *some* attributes.
char firstChar = name.charAt(0);
if (Character.isUpperCase(firstChar)) {
name = Character.toLowerCase(firstChar) + name.substring(1);
i = atts.get(name);
}
}
if (i != null) {
try {
result = new Attribute(name, i.invoke(null));
if (log.isTraceEnabled())
log.tracef("Attribute %s has r=%b,w=%b,is=%b and value %s",
name, i.attributeInfo.isReadable(), i.attributeInfo.isWritable(), i.attributeInfo.isIs(), result.getValue());
} catch (Exception e) {
log.debugf(e, "Exception while reading value of attribute %s", name);
throw new CacheException(e);
}
} else {
log.queriedAttributeNotFound(name);
//todo [anistor] why not throw an AttributeNotFoundException ?
}
return result;
}
private void setNamedAttribute(Attribute attribute) throws MBeanException, AttributeNotFoundException {
if (log.isDebugEnabled()) {
log.debugf("Invoking set on attribute %s with value %s", attribute.getName(), attribute.getValue());
}
String name = attribute.getName();
InvokableMBeanAttributeInfo i = atts.get(name);
if (i == null && !name.isEmpty()) {
// This is legacy. Earlier versions used an upper-case starting letter for *some* attributes.
char firstChar = name.charAt(0);
if (Character.isUpperCase(firstChar)) {
name = name.replaceFirst(Character.toString(firstChar), Character.toString(Character.toLowerCase(firstChar)));
i = atts.get(name);
}
}
if (i != null) {
try {
i.invoke(attribute);
} catch (Exception e) {
log.errorWritingValueForAttribute(name, e);
throw new MBeanException(e, "Error invoking setter for attribute " + name);
}
} else {
log.couldNotInvokeSetOnAttribute(name, attribute.getValue());
throw new AttributeNotFoundException("Could not find attribute " + name);
}
}
@Override
public ObjectName preRegister(MBeanServer server, ObjectName name) {
objectName = name;
return name;
}
@Override
public void postRegister(Boolean registrationDone) {
}
@Override
public void preDeregister() {
}
@Override
public void postDeregister() {
objectName = null;
}
private static abstract class InvokableMBeanAttributeInfo {
private final MBeanAttributeInfo attributeInfo;
InvokableMBeanAttributeInfo(String name, String type, String description, boolean isReadable, boolean isWritable, boolean isIs) {
attributeInfo = new MBeanAttributeInfo(name, type, description, isReadable, isWritable, isIs);
}
abstract Object invoke(Attribute a) throws IllegalAccessException, InvocationTargetException;
}
private final class InvokableFieldBasedMBeanAttributeInfo extends InvokableMBeanAttributeInfo {
private final Field field;
InvokableFieldBasedMBeanAttributeInfo(String name, String type, String description, boolean isReadable,
boolean isWritable, boolean isIs, Field field) {
super(name, type, description, isReadable, isWritable, isIs);
this.field = field;
}
@Override
Object invoke(Attribute a) throws IllegalAccessException {
if (!Modifier.isPublic(field.getModifiers())) field.setAccessible(true);
if (a == null) {
return field.get(obj);
} else {
field.set(obj, a.getValue());
return null;
}
}
}
private final class InvokableSetterBasedMBeanAttributeInfo extends InvokableMBeanAttributeInfo {
private final Method setter;
private final Method getter;
InvokableSetterBasedMBeanAttributeInfo(String name, String type, String description, boolean isReadable,
boolean isWritable, boolean isIs, Method getter, Method setter) {
super(name, type, description, isReadable, isWritable, isIs);
this.setter = setter;
this.getter = getter;
}
@Override
Object invoke(Attribute a) throws IllegalAccessException, InvocationTargetException {
if (a == null) {
if (!Modifier.isPublic(getter.getModifiers())) getter.setAccessible(true);
return getter.invoke(obj);
} else {
if (!Modifier.isPublic(setter.getModifiers())) setter.setAccessible(true);
return setter.invoke(obj, a.getValue());
}
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || o.getClass() != ResourceDMBean.class) return false;
ResourceDMBean that = (ResourceDMBean) o;
return obj == that.obj; // == is intentional
}
@Override
public int hashCode() {
return obj.hashCode();
}
@Override
public String toString() {
return "ResourceDMBean{" +
"obj=" + System.identityHashCode(obj) +
", objectClass=" + objectClass +
", mbeanName='" + mbeanName + '\'' +
", description='" + description + '\'' +
", objectName=" + objectName +
'}';
}
}
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