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// Portions Copyright [2020] Payara Foundation and/or affiliates
package org.jvnet.hk2.config;
import org.glassfish.hk2.api.MultiException;
import org.glassfish.hk2.api.ProxyCtl;
import org.glassfish.hk2.api.ServiceLocator;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.config.api.ConfigurationUtilities;
import javax.inject.Inject;
import java.beans.PropertyVetoException;
import java.beans.PropertyChangeEvent;
import java.lang.reflect.*;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
import java.util.logging.Level;
import java.util.*;
import org.jvnet.tiger_types.Types;
/**
*
* Helper class to execute some code on configuration objects while taking
* care of the transaction boiler plate code.
*
*
* Programmers that wish to apply some changes to configuration objects
* can use these convenience methods to reduce the complexity of handling
* transactions.
*
*
* For instance, say a programmer need to change the HttpListener port from
* 8080 to 8989, it just needs to do :
*
*
* ... in his code somewhere ...
* HttpListener httpListener = domain.get...
*
* // If the programmer tries to modify the httpListener directly
* // it will get an exception
* httpListener.setPort("8989"); // will generate a PropertyVetoException
*
* // instead he needs to use a transaction and can use the helper services
* ConfigSupport.apply(new SingleConfigCode() {
* public Object run(HttpListener okToChange) throws PropertyException {
* okToChange.setPort("8989"); // good...
* httpListener.setPort("7878"); // not good, exceptions still raised...
* return null;
* });
*
* // Note that after this code
* System.out.println("Port is " + httpListener.getPort());
* // will display 8989
* }
*
* @author Jerome Dochez
*/
@Service
public class ConfigSupport implements ConfigurationUtilities {
private static final Logger LOG = Logger.getLogger(ConfigSupport.class.getName());
public static int lockTimeOutInSeconds = Integer.getInteger("org.glassfish.hk2.config.locktimeout", 3);
@Inject
ServiceLocator habitat;
/**
* Execute some logic on one config bean of type T protected by a transaction
*
* @param code code to execute
* @param param config object participating in the transaction
* @return list of events that represents the modified config elements.
* @throws TransactionFailure when code did not run successfully
*/
public static Object apply(final SingleConfigCode code, T param)
throws TransactionFailure {
//ConfigBeanProxy[] objects = { param };
return apply((new ConfigCode() {
@Override
@SuppressWarnings("unchecked")
public Object run(ConfigBeanProxy... objects) throws PropertyVetoException, TransactionFailure {
return code.run((T) objects[0]);
}
}), param);
}
/**
* Executes some logic on some config beans protected by a transaction.
*
* @param code code to execute
* @param objects config beans participating to the transaction
* @return list of property change events
* @throws TransactionFailure when the code did run successfully due to a
* transaction exception
*/
public static Object apply(ConfigCode code, ConfigBeanProxy... objects)
throws TransactionFailure {
ConfigBean source = (ConfigBean) Dom.unwrap(objects[0]);
return source.getHabitat().getService(ConfigSupport.class)._apply(code, objects);
}
/**
* Executes some logic on some config beans protected by a transaction.
*
* @param code code to execute
* @param objects config beans participating to the transaction
* @return list of property change events
* @throws TransactionFailure when the code did run successfully due to a
* transaction exception
*/
public Object _apply(ConfigCode code, ConfigBeanProxy... objects) throws TransactionFailure {
LOG.finest(() -> String.format("_apply(code=%s, objects=%s)", code, objects));
// the fools think they operate on the "real" object while I am
// feeding them with writeable view. Only if the transaction succeed
// will I apply the "changes" to the real ones.
WriteableView[] views = new WriteableView[objects.length];
ConfigBeanProxy[] proxies = new ConfigBeanProxy[objects.length];
// create writeable views.
for (int i=0;i WriteableView getWriteableView(T s, ConfigBean sourceBean)
throws TransactionFailure {
WriteableView f = new WriteableView(s);
try {
if (sourceBean.getLock().tryLock(lockTimeOutInSeconds, TimeUnit.SECONDS)) {
sourceBean.setWriteableView(f);
return f;
}
} catch(InterruptedException e) {
// ignore, will throw a TransactionFailure exception
}
throw new TransactionFailure("Config bean already locked " + sourceBean, null);
}
/**
* Returns a writeable view of a configuration object
* @param source the configured interface implementation
* @return the new interface implementation providing write access
* @throws TransactionFailure if the object cannot be enrolled (probably already enrolled in
* another transaction).
*/
public T getWriteableView(final T source)
throws TransactionFailure {
T configBeanProxy = revealProxy(source);
ConfigView sourceBean = (ConfigView) Proxy.getInvocationHandler(configBeanProxy);
WriteableView writeableView = getWriteableView(configBeanProxy, (ConfigBean) sourceBean.getMasterView());
return (T) writeableView.getProxy(sourceBean.getProxyType());
}
/**
* Return the main implementation bean for a proxy.
* @param source configuration interface proxy
* @return the implementation bean
*/
public static ConfigView getImpl(ConfigBeanProxy source) {
Object bean = Proxy.getInvocationHandler(source);
if (bean instanceof ConfigView) {
return ((ConfigView) bean).getMasterView();
} else {
return (ConfigBean) bean;
}
}
/**
* Returns the type of configuration object this config proxy represents.
* @param element is the configuration object
* @return the configuration interface class
*/
public static Class proxyType(T element) {
ConfigView bean = getImpl(element);
return bean.getProxyType();
}
/**
* sort events and dispatch the changes. There will be only one notification of event
* per event type, per object, meaning that if an object has had 3 attributes changes, the
* Changed interface implementation will get notified only once.
*
* @param events of events that resulted of a successful configuration transaction
* @param target the intended receiver of the changes notification
* @param logger to log any issues.
*/
public static UnprocessedChangeEvents sortAndDispatch(PropertyChangeEvent[] events, Changed target, Logger logger) {
if (logger == null) {
throw new IllegalArgumentException();
}
List unprocessed = new ArrayList<>();
List added = new ArrayList<>();
List changed = new ArrayList<>();
for (PropertyChangeEvent event : events) {
if (event.getOldValue()==null && event.getNewValue() instanceof ConfigBeanProxy) {
// something was added
try {
final ConfigBeanProxy proxy = ConfigBeanProxy.class.cast(event.getNewValue());
added.add(Dom.unwrap(proxy));
final NotProcessed nc = target.changed(Changed.TYPE.ADD, proxyType(proxy), proxy);
if ( nc != null ) {
unprocessed.add( new UnprocessedChangeEvent(event, nc.getReason() ) );
}
} catch (Exception e) {
logger.log(Level.SEVERE, "Exception while processing config bean changes : ", e);
}
}
}
for (PropertyChangeEvent event : events) {
try {
Dom eventSource = Dom.unwrap((ConfigBeanProxy) event.getSource());
if (added.contains(eventSource)) {
// we don't really send the changed events for new comers.
continue;
}
ConfigBeanProxy proxy = null;
if (event.getNewValue()==null) {
try {
// getOldValue() can be null, we will notify a CHANGE event
proxy = ConfigBeanProxy.class.cast(event.getOldValue());
} catch (ClassCastException e) {
// this is ok, the old value was probably a string or something like this...
// we will notify the event.getSource() that it changed.
}
// new value is null, but not old value, we removed something
if (proxy!=null) {
final NotProcessed nc = target.changed(Changed.TYPE.REMOVE, proxyType(proxy), proxy );
if ( nc != null ) {
unprocessed.add( new UnprocessedChangeEvent(event, nc.getReason() ) );
}
continue;
}
}
// we fall back in this case, the newValue was nullm the old value was also null or was not a ConfigBean,
// we revert to just notify of the change.
// when the new value is not null, we also send the CHANGE on the source all the time, unless this was
// and added config bean.
if (!changed.contains(eventSource)) {
proxy = ConfigBeanProxy.class.cast(event.getSource());
changed.add(eventSource);
final NotProcessed nc = target.changed(Changed.TYPE.CHANGE, proxyType(proxy), proxy);
if ( nc != null ) {
unprocessed.add( new UnprocessedChangeEvent(event, nc.getReason() ) );
}
}
} catch (Exception e) {
logger.log(Level.SEVERE, "Exception while processing config bean changes : ", e);
}
}
return new UnprocessedChangeEvents( unprocessed );
}
// kind of insane, just to get the proper return type for my properties.
static private List defaultPropertyValue() {
return null;
}
public void apply(Map> mapOfChanges) throws TransactionFailure {
Transaction t = new Transaction();
try {
for (Map.Entry> configBeanChange : mapOfChanges.entrySet()) {
ConfigBean source = configBeanChange.getKey();
ConfigBeanProxy readableView = source.getProxy(source.getProxyType());
WriteableView writeable = getWriteableView(readableView, source);
if (!writeable.join(t)) {
t.rollback();
throw new TransactionFailure("Cannot enlist " + source.getProxyType() + " in transaction", null);
}
for (Map.Entry change : configBeanChange.getValue().entrySet()) {
String xmlName = change.getKey();
ConfigModel.Property prop = writeable.getProperty(xmlName);
if (prop == null) {
throw new TransactionFailure("Unknown property name " + xmlName + " on " + source.getProxyType(), null);
}
if (prop.isCollection()) {
try {
List values = (List) writeable.getter(prop,
ConfigSupport.class.getDeclaredMethod("defaultPropertyValue", null).getGenericReturnType());
values.add(change.getValue());
} catch (NoSuchMethodException e) {
throw new TransactionFailure("Unknown property name " + xmlName + " on " + source.getProxyType(), null);
}
} else {
writeable.setter(prop, change.getValue(), String.class);
}
}
}
} catch(TransactionFailure e) {
t.rollback();
throw e;
} catch (Exception e) {
t.rollback();
throw new TransactionFailure(e.getMessage(), e);
}
try {
t.commit();
} catch (RetryableException e) {
LOG.log(Level.WARNING, "Retryable...", e);
// TODO : do something meaninful here
t.rollback();
throw new TransactionFailure(e.getMessage(), e);
} catch (TransactionFailure e) {
LOG.log(Level.SEVERE, "failure, not retryable...");
t.rollback();
throw e;
}
}
/**
* Returns the list of sub-elements supported by a ConfigBean
* @return array of classes reprensenting the sub elements of a particular
* @throws ClassNotFoundException for severe errors with the model associated
* with the passed config bean.
*/
public static Class[] getSubElementsTypes(ConfigBean bean)
throws ClassNotFoundException {
List> subTypes = new ArrayList<>();
for (ConfigModel.Property element : bean.model.elements.values()) {
if (!element.isLeaf()) {
ConfigModel elementModel = ((ConfigModel.Node) element).model;
Class subType = elementModel.classLoaderHolder.loadClass(elementModel.targetTypeName);
subTypes.add(subType);
} else {
if (element.isCollection()) {
subTypes.add(List.class);
}
}
}
return subTypes.toArray(new Class[subTypes.size()]);
}
/**
* Returns the list of attributes names by the passed ConfigBean
* @return array of String for all the attributes names
*/
public String[] getAttributesNames(ConfigBean bean) {
return xmlNames(bean.model.attributes.values());
}
/**
* Returns the list of elements names by the passed ConfigBean
* @return array of String for all the elements names
*/
public String[] getElementsNames(ConfigBean bean) {
return xmlNames(bean.model.elements.values());
}
private String[] xmlNames(Collection properties) {
List names = new ArrayList<>();
for (ConfigModel.Property attribute : properties) {
names.add(attribute.xmlName());
}
return names.toArray(new String[names.size()]);
}
/**
* Creates a new child of the passed child and add it to the parent's live
* list of elements. The child is also initialized with the attributes passed
* where each key represent the xml property name for the attribute and the value
* represent the attribute's value.
*
* This code will be executed within a Transaction and can therefore throw
* a TransactionFailure when the creation or settings of attributes failed.
*
* Example creating a new http-listener element under http-service
* ConfigBean httpService = ... // got it from somwhere.
* Map attributes = new HashMap();
* attributes.put("id", "jerome-listener");
* attributes.put("enabled", "true");
* ConfigSupport.createAndSet(httpService, HttpListener.class, attributes);
*
* @param parent parent config bean to which the child will be added.
* @param childType child type
* @param attributes map of key value pair to set on the newly created child
* @throws TransactionFailure if the creation or attribute settings failed
*/
public static ConfigBean createAndSet(
final ConfigBean parent,
final Class childType,
final Map attributes,
final TransactionCallBack runnable)
throws TransactionFailure {
return createAndSet(parent, childType, convertMapToAttributeChanges(attributes), runnable);
}
/**
* Creates a new child of the passed child and add it to the parent's live
* list of elements. The child is also initialized with the attributes passed
* where each key represent the xml property name for the attribute and the value
* represent the attribute's value.
*
* This code will be executed within a Transaction and can therefore throw
* a TransactionFailure when the creation or settings of attributes failed.
*
* Example creating a new http-listener element under http-service
* ConfigBean httpService = ... // got it from somwhere.
* Map attributes = new HashMap();
* attributes.put("id", "jerome-listener");
* attributes.put("enabled", "true");
* ConfigSupport.createAndSet(httpService, HttpListener.class, attributes);
*
* @param parent parent config bean to which the child will be added.
* @param childType child type
* @param attributes list of attribute changes to apply to the newly created child
* @param runnable code that will be invoked as part of the transaction to add
* more attributes or elements to the newly create type
* @throws TransactionFailure if the creation or attribute settings failed
*/
public static ConfigBean createAndSet(
final ConfigBean parent,
final Class childType,
final List attributes,
final TransactionCallBack runnable)
throws TransactionFailure {
return parent.getHabitat().getService(ConfigSupport.class).
_createAndSet(parent, childType, attributes, runnable);
}
private ConfigBean _createAndSet(
final ConfigBean parent,
final Class childType,
final List attributes,
final TransactionCallBack runnable)
throws TransactionFailure {
LOG.finest(() -> String.format("_createAndSet(parent=%s, childType=%s, attributes=%s, runnable=%s)",
parent, childType, attributes, runnable));
ConfigBeanProxy readableView = parent.getProxy(parent.getProxyType());
ConfigBeanProxy readableChild = (ConfigBeanProxy) apply(new SingleConfigCode() {
@Override
public Object run(ConfigBeanProxy param) throws PropertyVetoException, TransactionFailure {
return addChildWithAttributes(param, parent, childType, attributes, runnable);
}
}, readableView);
return (ConfigBean) Dom.unwrap(readableChild);
}
/**
* Creates a new child of the passed child and add it to the parent's live
* list of elements. The child is also initialized with the attributes passed
* where each key represent the xml property name for the attribute and the value
* represent the attribute's value.
*
* This code will be executed within a Transaction and can therefore throw
* a TransactionFailure when the creation or settings of attributes failed.
*
* Example creating a new http-listener element under http-service
* ConfigBean httpService = ... // got it from somwhere.
* Map attributes = new HashMap();
* attributes.put("id", "jerome-listener");
* attributes.put("enabled", "true");
* ConfigSupport.createAndSet(httpService, HttpListener.class, attributes);
*
* @param parent parent config bean to which the child will be added.
* @param childType child type
* @param attributes list of attributes changes to apply to the new created child
* @throws TransactionFailure if the creation or attribute settings failed
*/
public static ConfigBean createAndSet(
final ConfigBean parent,
final Class childType,
final Map attributes)
throws TransactionFailure {
return createAndSet(parent, childType, attributes, null);
}
public ConfigBean createAndSet(
final ConfigBean parent,
final Class childType,
final List attributes)
throws TransactionFailure {
return createAndSet(parent, childType, attributes, null);
}
public static void deleteChild(
final ConfigBean parent,
final ConfigBean child)
throws TransactionFailure {
ConfigBeanProxy readableView = parent.getProxy(parent.getProxyType());
apply(new SingleConfigCode() {
@Override
public Object run(ConfigBeanProxy param) throws PropertyVetoException, TransactionFailure {
// remove the child from the parent.
WriteableView writeableParent = (WriteableView) Proxy.getInvocationHandler(param);
_deleteChild(parent, writeableParent, child);
return child;
}
}, readableView);
}
/**
* Unprotected child deletion, caller must start a transaction before calling this
* method.
*
* @param parent the parent element
* @param writeableParent the writeable view of the parent element
* @param child the child to delete
* @throws TransactionFailure if something goes wrong.
*/
public static void _deleteChild(
final ConfigBean parent,
final WriteableView writeableParent,
final ConfigBean child)
throws TransactionFailure {
LOG.finest(() -> String.format("_deleteChild(parent=%s, writeableParent=%s, child=%s)",
parent, writeableParent, child));
final Class childType = child.getProxyType();
// get the child
ConfigBeanProxy childProxy = child.getProxy(childType);
// get the parent type
Class parentProxyType = parent.getProxyType();
// first we need to find the element associated with this type
ConfigModel.Property element = null;
for (ConfigModel.Property e : parent.model.elements.values()) {
if (!(e instanceof ConfigModel.Node)) {
continue;
}
ConfigModel elementModel = ((ConfigModel.Node) e).model;
try {
final Class targetClass = parent.model.classLoaderHolder.loadClass(elementModel.targetTypeName);
if (targetClass.isAssignableFrom(childType)) {
element = e;
break;
}
} catch(Exception ex) {
// ok.
}
}
// now depending whether this is a collection or a single leaf,
// we need to process this setting differently
if (element != null) {
if (element.isCollection()) {
// this is kind of nasty, I have to find the method that returns the collection
// object because trying to do a element.get without having the parametized List
// type will not work.
for (Method m : parentProxyType.getMethods()) {
final Class returnType = m.getReturnType();
if (Collection.class.isAssignableFrom(returnType) && (m.getParameterTypes().length == 0)) {
// this could be it...
if (!(m.getGenericReturnType() instanceof ParameterizedType)) {
throw new IllegalArgumentException("List needs to be parameterized");
}
final Class itemType = Types.erasure(Types.getTypeArgument(m.getGenericReturnType(), 0));
if (itemType.isAssignableFrom(childType)) {
List list = null;
try {
list = (List) m.invoke(writeableParent.getProxy(writeableParent.getProxyType()), null);
} catch (IllegalAccessException e) {
throw new TransactionFailure("Exception while adding to the parent", e);
} catch (InvocationTargetException e) {
throw new TransactionFailure("Exception while adding to the parent", e);
}
if (list != null) {
list.remove(childProxy);
break;
}
}
}
}
} else {
// much simpler, I can use the setter directly.
writeableParent.setter(element, null, childType);
}
} else {
throw new TransactionFailure("Parent " + parent.getProxyType() + " does not have a child of type " + childType);
}
}
public static List convertMapToAttributeChanges(Map values) {
if (values==null) {
return null;
}
List changes = new ArrayList<>();
for(Map.Entry entry : values.entrySet()) {
changes.add(new SingleAttributeChange(entry.getKey(), entry.getValue()));
}
return changes;
}
public static class SingleAttributeChange extends AttributeChanges {
final String[] values = new String[1];
public SingleAttributeChange(String name, String value) {
super(name);
values[0] = value;
}
@Override
String[] values() {
return values;
}
}
public static class MultipleAttributeChanges extends AttributeChanges {
final String[] values;
public MultipleAttributeChanges(String name, String[] values) {
super(name);
this.values = values;
}
@Override
String[] values() {
return values;
}
}
public static Class getElementTypeByName(ConfigBeanProxy parent, String elementName)
throws ClassNotFoundException {
final Dom parentDom = Dom.unwrap(parent);
DomDocument document = parentDom.document;
ConfigModel.Property a = parentDom.model.elements.get(elementName);
if (a!=null) {
if (a.isLeaf()) {
// dochez : I am not too sure, but that should be a String @Element
return null;
} else {
ConfigModel childModel = ((ConfigModel.Node) a).model;
return (Class) childModel.classLoaderHolder.loadClass(childModel.targetTypeName);
}
}
// global lookup
ConfigModel model = document.getModelByElementName(elementName);
if (model!=null) {
return (Class) model.classLoaderHolder.loadClass(model.targetTypeName);
}
return null;
}
/**
* Unwrap HK2 proxy to ConfigBeanProxy.
* @param ConfigBeanProxy probably proxied by HK2.
* @return actual ConfigBeanProxy.
* @throws MultiException If there was an error resolving the proxy.
*/
@SuppressWarnings("unchecked")
public static T revealProxy(T proxy) {
if (proxy instanceof ProxyCtl) {
ProxyCtl proxyCtl = (ProxyCtl) proxy;
proxy = (T) proxyCtl.__make();
}
return proxy;
}
@Override
public Object addChildWithAttributes(ConfigBeanProxy param,
ConfigBean parent,
Class childType,
List attributes,
TransactionCallBack runnable) throws TransactionFailure {
LOG.finest(
() -> String.format("addChildWithAttributes(param=%s, parent=%s, childType=%s, attributes=%s, runnable=%s)",
param, parent, childType, attributes, runnable));
// create the child
ConfigBeanProxy child = param.createChild(childType);
Dom dom = Dom.unwrap(child);
// add the child to the parent.
WriteableView writeableParent = (WriteableView) Proxy.getInvocationHandler(param);
Class parentProxyType = parent.getProxyType();
// first we need to find the element associated with this type
ConfigModel.Property element = null;
for (ConfigModel.Property e : parent.model.elements.values()) {
if (e.isLeaf()) {
continue;
}
ConfigModel elementModel = ((ConfigModel.Node) e).model;
LOG.fine(() -> "elementModel.targetTypeName = " + elementModel.targetTypeName +
", collection: " + e.isCollection() + ", childType.getName() = " + childType.getName());
if (elementModel.targetTypeName.equals(childType.getName())) {
element = e;
break;
}
else if ( e.isCollection() ) {
try {
final Class tempClass = elementModel.classLoaderHolder.loadClass(elementModel.targetTypeName);
if ( tempClass.isAssignableFrom( childType ) ) {
element = e;
break;
}
} catch (Exception ex ) {
throw new TransactionFailure("EXCEPTION getting class for " + elementModel.targetTypeName, ex);
}
}
}
// now depending whether this is a collection or a single leaf,
// we need to process this setting differently
if (element != null) {
if (element.isCollection()) {
// this is kind of nasty, I have to find the method that returns the collection
// object because trying to do a element.get without having the parametized List
// type will not work.
for (Method m : parentProxyType.getMethods()) {
final Class returnType = m.getReturnType();
if (Collection.class.isAssignableFrom(returnType) && (m.getParameterTypes().length == 0)) {
// this could be it...
if (!(m.getGenericReturnType() instanceof ParameterizedType)) {
throw new IllegalArgumentException("List needs to be parameterized");
}
final Class itemType = Types.erasure(Types.getTypeArgument(m.getGenericReturnType(), 0));
if (itemType.isAssignableFrom(childType)) {
List list = null;
try {
list = (List) m.invoke(param, null);
} catch (IllegalAccessException e) {
throw new TransactionFailure("Exception while adding to the parent", e);
} catch (InvocationTargetException e) {
throw new TransactionFailure("Exception while adding to the parent", e);
}
if (list != null) {
list.add(child);
break;
}
}
}
}
} else {
// much simpler, I can use the setter directly.
writeableParent.setter(element, dom.createProxy(), childType);
}
} else {
throw new TransactionFailure("Parent " + parent.getProxyType() + " does not have a child of type " + childType);
}
WriteableView writeableChild = (WriteableView) Proxy.getInvocationHandler(child);
applyProperties(writeableChild, attributes);
dom.addDefaultChildren();
dom.register();
if (runnable!=null) {
runnable.performOn(writeableChild);
}
return child;
}
private static void applyProperties(WriteableView target, List changes)
throws TransactionFailure {
if (changes != null) {
for (AttributeChanges change : changes) {
ConfigModel.Property prop = target.getProperty(change.getName());
if (prop == null) {
throw new TransactionFailure("Unknown property name " + change.getName() + " on " + target.getProxyType());
}
if (prop.isCollection()) {
// we need access to the List
try {
List list = (List) target.getter(prop, ConfigSupport.class.getDeclaredMethod("defaultPropertyValue", null).getGenericReturnType());
for (String value : change.values()) {
list.add(value);
}
} catch (NoSuchMethodException e) {
throw new TransactionFailure(e.getMessage(), e);
}
} else {
target.setter(prop, change.values()[0], String.class);
}
}
}
}
}