Ziele Untersuchung
mit Columbo Integrität von
Datenbanken Interaktion und
Portierbarkeit Ergonomie der
Schnittstellen

Angebot Produkte Projekt Beratung

Mittel Analytik Modellierung Sprachen Algebra Logik Hardware Denken Kreativität

Zusammenhänge Gesellschaft Wirtschaft Branche Firma


products/sources/formale Sprachen/Java/Tomcat/java/org/apache/tomcat/util/modeler/ (Apache Software Stiftung Version 2.4.65^©) Datei vom 10.10.2023 mit Größe 18 kB

Quelle ManagedBean.java Sprache: JAVA

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.tomcat.util.modeler;

import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import javax.management.AttributeNotFoundException;
import javax.management.DynamicMBean;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanConstructorInfo;
import javax.management.MBeanException;
import javax.management.MBeanInfo;
import javax.management.MBeanNotificationInfo;
import javax.management.MBeanOperationInfo;
import javax.management.ReflectionException;
import javax.management.RuntimeOperationsException;
import javax.management.ServiceNotFoundException;

import org.apache.tomcat.util.buf.StringUtils;
import org.apache.tomcat.util.res.StringManager;

/**
* <p>Internal configuration information for a managed bean (MBean)
* descriptor.</p>
*
* @author Craig R. McClanahan
*/
public class ManagedBean implements java.io.Serializable {

    private static final long serialVersionUID = 1L;
    private static final StringManager sm = StringManager.getManager(ManagedBean.class);

    private static final String BASE_MBEAN = "org.apache.tomcat.util.modeler.BaseModelMBean";
    // ----------------------------------------------------- Instance Variables
    static final Class<?>[] NO_ARGS_PARAM_SIG = new Class[0];

    private final ReadWriteLock mBeanInfoLock = new ReentrantReadWriteLock();
    /**
     * The <code>ModelMBeanInfo</code> object that corresponds
     * to this <code>ManagedBean</code> instance.
     */
    private transient volatile MBeanInfo info = null;

    private Map<String,AttributeInfo> attributes = new HashMap<>();

    private Map<String,OperationInfo> operations = new HashMap<>();

    protected String className = BASE_MBEAN;
    protected String description = null;
    protected String domain = null;
    protected String group = null;
    protected String name = null;

    private NotificationInfo notifications[] = new NotificationInfo[0];
    protected String type = null;

    /**
     * Constructor. Will add default attributes.
     */
    public ManagedBean() {
        AttributeInfo ai=new AttributeInfo();
        ai.setName("modelerType");
        ai.setDescription("Type of the modeled resource. Can be set only once");
        ai.setType("java.lang.String");
        ai.setWriteable(false);
        addAttribute(ai);
    }

    // ------------------------------------------------------------- Properties

    /**
     * @return the collection of attributes for this MBean.
     */
    public AttributeInfo[] getAttributes() {
        return attributes.values().toArray(new AttributeInfo[0]);
    }

    /**
     * The fully qualified name of the Java class of the MBean
     * described by this descriptor.  If not specified, the standard JMX
     * class (<code>javax.management.modelmbean.RequiredModeLMBean</code>)
     * will be utilized.
     * @return the class name
     */
    public String getClassName() {
        return this.className;
    }

    public void setClassName(String className) {
        mBeanInfoLock.writeLock().lock();
        try {
            this.className = className;
            this.info = null;
        } finally {
            mBeanInfoLock.writeLock().unlock();
        }
    }

    /**
     * @return the human-readable description of this MBean.
     */
    public String getDescription() {
        return this.description;
    }

    public void setDescription(String description) {
        mBeanInfoLock.writeLock().lock();
        try {
            this.description = description;
            this.info = null;
        } finally {
            mBeanInfoLock.writeLock().unlock();
        }
    }

    /**
     * @return the (optional) <code>ObjectName</code> domain in which
     *  this MBean should be registered in the MBeanServer.
     */
    public String getDomain() {
        return this.domain;
    }

    public void setDomain(String domain) {
        this.domain = domain;
    }

    /**
     * @return the (optional) group to which this MBean belongs.
     */
    public String getGroup() {
        return this.group;
    }

    public void setGroup(String group) {
        this.group = group;
    }

    /**
     * @return the name of this managed bean, which must be unique
     *  among all MBeans managed by a particular MBeans server.
     */
    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        mBeanInfoLock.writeLock().lock();
        try {
            this.name = name;
            this.info = null;
        } finally {
            mBeanInfoLock.writeLock().unlock();
        }
    }

    /**
     * @return the collection of notifications for this MBean.
     */
    public NotificationInfo[] getNotifications() {
        return this.notifications;
    }

    /**
     * @return the collection of operations for this MBean.
     */
    public OperationInfo[] getOperations() {
        return operations.values().toArray(new OperationInfo[0]);
    }

    /**
     * @return the fully qualified name of the Java class of the resource
     * implementation class described by the managed bean described
     * by this descriptor.
     */
    public String getType() {
        return this.type;
    }

    public void setType(String type) {
        mBeanInfoLock.writeLock().lock();
        try {
            this.type = type;
            this.info = null;
        } finally {
            mBeanInfoLock.writeLock().unlock();
        }
    }

    // --------------------------------------------------------- Public Methods

    /**
     * Add a new attribute to the set of attributes for this MBean.
     *
     * @param attribute The new attribute descriptor
     */
    public void addAttribute(AttributeInfo attribute) {
        attributes.put(attribute.getName(), attribute);
    }

    /**
     * Add a new notification to the set of notifications for this MBean.
     *
     * @param notification The new notification descriptor
     */
    public void addNotification(NotificationInfo notification) {
        mBeanInfoLock.writeLock().lock();
        try {
            NotificationInfo results[] =
                new NotificationInfo[notifications.length + 1];
            System.arraycopy(notifications, 0, results, 0,
                             notifications.length);
            results[notifications.length] = notification;
            notifications = results;
            this.info = null;
        } finally {
            mBeanInfoLock.writeLock().unlock();
        }
    }

    /**
     * Add a new operation to the set of operations for this MBean.
     *
     * @param operation The new operation descriptor
     */
    public void addOperation(OperationInfo operation) {
        operations.put(createOperationKey(operation), operation);
    }

    /**
     * Create and return a <code>ModelMBean</code> that has been
     * preconfigured with the <code>ModelMBeanInfo</code> information
     * for this managed bean, and is associated with the specified
     * managed object instance.  The returned <code>ModelMBean</code>
     * will <strong>NOT</strong> have been registered with our
     * <code>MBeanServer</code>.
     *
     * @param instance Instanced of the managed object, or <code>null</code>
     *  for no associated instance
     * @return the MBean
     * @exception InstanceNotFoundException if the managed resource
     *  object cannot be found
     * @exception MBeanException if a problem occurs instantiating the
     *  <code>ModelMBean</code> instance
     * @exception RuntimeOperationsException if a JMX runtime error occurs
     */
    public DynamicMBean createMBean(Object instance)
        throws InstanceNotFoundException,
        MBeanException, RuntimeOperationsException {

        BaseModelMBean mbean = null;

        // Load the ModelMBean implementation class
        if(getClassName().equals(BASE_MBEAN)) {
            // Skip introspection
            mbean = new BaseModelMBean();
        } else {
            Class<?> clazz = null;
            Exception ex = null;
            try {
                clazz = Class.forName(getClassName());
            } catch (Exception e) {
            }

            if( clazz==null ) {
                try {
                    ClassLoader cl= Thread.currentThread().getContextClassLoader();
                    if ( cl != null) {
                        clazz= cl.loadClass(getClassName());
                    }
                } catch (Exception e) {
                    ex=e;
                }
            }

            if( clazz==null) {
                throw new MBeanException
                    (ex, sm.getString("managedMBean.cannotLoadClass", getClassName()));
            }
            try {
                // Stupid - this will set the default minfo first....
                mbean = (BaseModelMBean) clazz.getConstructor().newInstance();
            } catch (RuntimeOperationsException e) {
                throw e;
            } catch (Exception e) {
                throw new MBeanException
                    (e, sm.getString("managedMBean.cannotInstantiateClass", getClassName()));
            }
        }

        mbean.setManagedBean(this);

        // Set the managed resource (if any)
        try {
            if (instance != null) {
                mbean.setManagedResource(instance, "ObjectReference");
            }
        } catch (InstanceNotFoundException e) {
            throw e;
        }

        return mbean;
    }

    /**
     * Create and return a <code>ModelMBeanInfo</code> object that
     * describes this entire managed bean.
     * @return the MBean info
     */
    MBeanInfo getMBeanInfo() {

        // Return our cached information (if any)
        mBeanInfoLock.readLock().lock();
        try {
            if (info != null) {
                return info;
            }
        } finally {
            mBeanInfoLock.readLock().unlock();
        }

        mBeanInfoLock.writeLock().lock();
        try {
            if (info == null) {
                // Create subordinate information descriptors as required
                AttributeInfo attrs[] = getAttributes();
                MBeanAttributeInfo attributes[] =
                    new MBeanAttributeInfo[attrs.length];
                for (int i = 0; i < attrs.length; i++) {
                    attributes[i] = attrs[i].createAttributeInfo();
                }

                OperationInfo opers[] = getOperations();
                MBeanOperationInfo operations[] =
                    new MBeanOperationInfo[opers.length];
                for (int i = 0; i < opers.length; i++) {
                    operations[i] = opers[i].createOperationInfo();
                }

                NotificationInfo notifs[] = getNotifications();
                MBeanNotificationInfo notifications[] =
                    new MBeanNotificationInfo[notifs.length];
                for (int i = 0; i < notifs.length; i++) {
                    notifications[i] = notifs[i].createNotificationInfo();
                }

                // Construct and return a new ModelMBeanInfo object
                info = new MBeanInfo(getClassName(),
                                     getDescription(),
                                     attributes,
                                     new MBeanConstructorInfo[] {},
                                     operations,
                                     notifications);
            }

            return info;
        } finally {
            mBeanInfoLock.writeLock().unlock();
        }
    }

    /**
     * Return a string representation of this managed bean.
     */
    @Override
    public String toString() {

        StringBuilder sb = new StringBuilder("ManagedBean[");
        sb.append("name=");
        sb.append(name);
        sb.append(", className=");
        sb.append(className);
        sb.append(", description=");
        sb.append(description);
        if (group != null) {
            sb.append(", group=");
            sb.append(group);
        }
        sb.append(", type=");
        sb.append(type);
        sb.append(']');
        return sb.toString();

    }

    Method getGetter(String aname, BaseModelMBean mbean, Object resource)
            throws AttributeNotFoundException, ReflectionException {

        Method m = null;

        AttributeInfo attrInfo = attributes.get(aname);
        // Look up the actual operation to be used
        if (attrInfo == null) {
            throw new AttributeNotFoundException(sm.getString("managedMBean.noAttribute", aname, resource));
        }

        String getMethod = attrInfo.getGetMethod();

        Object object = null;
        NoSuchMethodException exception = null;
        try {
            object = mbean;
            m = object.getClass().getMethod(getMethod, NO_ARGS_PARAM_SIG);
        } catch (NoSuchMethodException e) {
            exception = e;
        }
        if (m == null && resource != null) {
            try {
                object = resource;
                m = object.getClass().getMethod(getMethod, NO_ARGS_PARAM_SIG);
                exception=null;
            } catch (NoSuchMethodException e) {
                exception = e;
            }
        }
        if (exception != null) {
            throw new ReflectionException(exception, sm.getString("managedMBean.noGet", getMethod, resource));
        }

        return m;
    }

    public Method getSetter(String aname, BaseModelMBean bean, Object resource)
            throws AttributeNotFoundException, ReflectionException {

        Method m = null;

        AttributeInfo attrInfo = attributes.get(aname);
        if (attrInfo == null) {
            throw new AttributeNotFoundException(sm.getString("managedMBean.noAttribute", aname, resource));
        }

        // Look up the actual operation to be used
        String setMethod = attrInfo.getSetMethod();
        String argType=attrInfo.getType();

        Class<?> signature[] = new Class[] { BaseModelMBean.getAttributeClass( argType ) };

        Object object = null;
        NoSuchMethodException exception = null;
        try {
            object = bean;
            m = object.getClass().getMethod(setMethod, signature);
        } catch (NoSuchMethodException e) {
            exception = e;
        }
        if (m == null && resource != null) {
            try {
                object = resource;
                m = object.getClass().getMethod(setMethod, signature);
                exception=null;
            } catch (NoSuchMethodException e) {
                exception = e;
            }
        }
        if (exception != null) {
            throw new ReflectionException(exception, sm.getString("managedMBean.noSet", setMethod, resource));
        }

        return m;
    }

    public Method getInvoke(String aname, Object[] params, String[] signature, BaseModelMBean bean, Object resource)
            throws MBeanException, ReflectionException {

        Method method = null;

        if (params == null) {
            params = new Object[0];
        }
        if (signature == null) {
            signature = new String[0];
        }
        if (params.length != signature.length) {
            throw new RuntimeOperationsException(
                    new IllegalArgumentException(sm.getString("managedMBean.inconsistentArguments")),
                    sm.getString("managedMBean.inconsistentArguments"));
        }

        // Acquire the ModelMBeanOperationInfo information for
        // the requested operation
        OperationInfo opInfo =
                operations.get(createOperationKey(aname, signature));
        if (opInfo == null) {
            throw new MBeanException(new ServiceNotFoundException(sm.getString("managedMBean.noOperation", aname)),
                    sm.getString("managedMBean.noOperation", aname));
        }

        // Prepare the signature required by Java reflection APIs
        // FIXME - should we use the signature from opInfo?
        Class<?> types[] = new Class[signature.length];
        for (int i = 0; i < signature.length; i++) {
            types[i] = BaseModelMBean.getAttributeClass(signature[i]);
        }

        // Locate the method to be invoked, either in this MBean itself
        // or in the corresponding managed resource
        // FIXME - Accessible methods in superinterfaces?
        Object object = null;
        Exception exception = null;
        try {
            object = bean;
            method = object.getClass().getMethod(aname, types);
        } catch (NoSuchMethodException e) {
            exception = e;
        }
        try {
            if ((method == null) && (resource != null)) {
                object = resource;
                method = object.getClass().getMethod(aname, types);
            }
        } catch (NoSuchMethodException e) {
            exception = e;
        }
        if (method == null) {
            throw new ReflectionException(exception, sm.getString("managedMBean.noMethod", aname));
        }

        return method;
    }

    private String createOperationKey(OperationInfo operation) {
        StringBuilder key = new StringBuilder(operation.getName());
        key.append('(');
        StringUtils.join(operation.getSignature(), ',', FeatureInfo::getType, key);
        key.append(')');

        return key.toString().intern();
    }

    private String createOperationKey(String methodName, String[] parameterTypes) {
        StringBuilder key = new StringBuilder(methodName);
        key.append('(');
        StringUtils.join(parameterTypes, ',', key);
        key.append(')');

        return key.toString().intern();
    }
}

quality93%

¤ Dauer der Verarbeitung: 0.2 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.