/*
* Copyright 2000-2016 Vaadin Ltd.
*
* 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.vaadin.server;
import java.io.IOException;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.EventObject;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Logger;
import com.vaadin.event.EventRouter;
import com.vaadin.event.MethodEventSource;
import com.vaadin.shared.Registration;
import com.vaadin.shared.communication.ClientRpc;
import com.vaadin.shared.communication.ServerRpc;
import com.vaadin.shared.communication.SharedState;
import com.vaadin.shared.ui.ComponentStateUtil;
import com.vaadin.ui.Component;
import com.vaadin.ui.Component.Event;
import com.vaadin.ui.HasComponents;
import com.vaadin.ui.LegacyComponent;
import com.vaadin.ui.UI;
import elemental.json.JsonObject;
import elemental.json.JsonValue;
/**
* An abstract base class for ClientConnector implementations. This class
* provides all the basic functionality required for connectors.
*
* @author Vaadin Ltd
* @since 7.0.0
*/
public abstract class AbstractClientConnector
implements ClientConnector, MethodEventSource {
/**
* A map from client to server RPC interface class name to the RPC call
* manager that handles incoming RPC calls for that interface.
*/
private final Map<String, ServerRpcManager<?>> rpcManagerMap = new HashMap<>();
/**
* A map from server to client RPC interface class to the RPC proxy that
* sends ourgoing RPC calls for that interface.
*/
private final Map<Class<?>, ClientRpc> rpcProxyMap = new HashMap<>();
/**
* Shared state object to be communicated from the server to the client when
* modified.
*/
private SharedState sharedState;
private Class<? extends SharedState> stateType;
/**
* Pending RPC method invocations to be sent.
*/
private ArrayList<ClientMethodInvocation> pendingInvocations = new ArrayList<>();
private String connectorId;
private final ArrayList<Extension> extensions = new ArrayList<>();
/**
* The EventRouter used for the event model.
*/
private EventRouter eventRouter = null;
private ErrorHandler errorHandler = null;
private static final ConcurrentHashMap<Class<? extends AbstractClientConnector>, Class<? extends SharedState>> stateTypeCache = new ConcurrentHashMap<>();
@Override
public Registration addAttachListener(AttachListener listener) {
return addListener(AttachEvent.ATTACH_EVENT_IDENTIFIER,
AttachEvent.class, listener, AttachListener.attachMethod);
}
@Override
@Deprecated
public void removeAttachListener(AttachListener listener) {
removeListener(AttachEvent.ATTACH_EVENT_IDENTIFIER, AttachEvent.class,
listener);
}
@Override
public Registration addDetachListener(DetachListener listener) {
return addListener(DetachEvent.DETACH_EVENT_IDENTIFIER,
DetachEvent.class, listener, DetachListener.detachMethod);
}
@Override
@Deprecated
public void removeDetachListener(DetachListener listener) {
removeListener(DetachEvent.DETACH_EVENT_IDENTIFIER, DetachEvent.class,
listener);
}
/**
* @deprecated As of 7.0, use {@link #markAsDirty()} instead. Note that you
* typically do not need to call {@link #markAsDirty()} as
* {@link #getState()} will mark the connector dirty and the
* framework will then check what, if anything, needs to be sent
* to the client. {@link LegacyComponent}s which rely on paint
* might still need to call this or {@link #markAsDirty()} .
*/
@Deprecated
@Override
public void requestRepaint() {
markAsDirty();
}
/* Documentation copied from interface */
@Override
public void markAsDirty() {
assert getSession() == null
|| getSession().hasLock() : buildLockAssertMessage(
"markAsDirty()");
UI uI = getUI();
if (uI != null) {
uI.getConnectorTracker().markDirty(this);
}
}
private String buildLockAssertMessage(String method) {
if (VaadinService.isOtherSessionLocked(getSession())) {
return "The session of this connecor is not locked, but there is another session that is locked. "
+ "This might be caused by accidentally using a connector that belongs to another session.";
} else {
return "Session must be locked when " + method + " is called";
}
}
/**
* Registers an RPC interface implementation for this component.
*
* A component can listen to multiple RPC interfaces, and subclasses can
* register additional implementations.
*
* @since 7.0
*
* @param implementation
* RPC interface implementation
* @param rpcInterfaceType
* RPC interface class for which the implementation should be
* registered
*/
protected <T extends ServerRpc> void registerRpc(T implementation,
Class<T> rpcInterfaceType) {
rpcManagerMap.put(rpcInterfaceType.getName(),
new ServerRpcManager<>(implementation, rpcInterfaceType));
}
/**
* Registers an RPC interface implementation for this component.
*
* A component can listen to multiple RPC interfaces, and subclasses can
* register additional implementations.
*
* @since 7.0
*
* @param implementation
* RPC interface implementation. Also used to deduce the type.
*/
protected <T extends ServerRpc> void registerRpc(T implementation) {
// Search upwards until an interface is found. It must be found as T
// extends ServerRpc
Class<?> cls = implementation.getClass();
Class<ServerRpc> serverRpcClass = getServerRpcInterface(cls);
while (cls != null && serverRpcClass == null) {
cls = cls.getSuperclass();
serverRpcClass = getServerRpcInterface(cls);
}
if (serverRpcClass == null) {
throw new RuntimeException(
"No interface T extends ServerRpc found in the class hierarchy.");
}
registerRpc(implementation, serverRpcClass);
}
@SuppressWarnings("unchecked")
private Class<ServerRpc> getServerRpcInterface(
Class<?> implementationClass) {
Class<ServerRpc> serverRpcClass = null;
if (implementationClass != null) {
for (Class<?> candidateInterface : implementationClass
.getInterfaces()) {
if (ServerRpc.class.isAssignableFrom(candidateInterface)) {
if (serverRpcClass != null) {
throw new RuntimeException(
"Use registerRpc(T implementation, Class<T> rpcInterfaceType) if the Rpc implementation implements more than one interface");
}
serverRpcClass = (Class<ServerRpc>) candidateInterface;
}
}
}
return serverRpcClass;
}
/**
* Returns the shared state for this connector. The shared state object is
* shared between the server connector and the client connector. Changes are
* only communicated from the server to the client and not in the other
* direction.
* <p>
* As a side effect, marks the connector dirty so any changes done to the
* state will be sent to the client. Use {@code getState(false)} to avoid
* marking the connector as dirty.
* </p>
*
* @return The shared state for this connector. Never null.
*/
protected SharedState getState() {
return getState(true);
}
/**
* Returns the shared state for this connector.
*
* @param markAsDirty
* true if the connector should automatically be marked dirty,
* false otherwise
*
* @return The shared state for this connector. Never null.
* @see #getState()
*/
protected SharedState getState(boolean markAsDirty) {
assert getSession() == null
|| getSession().hasLock() : buildLockAssertMessage(
"getState()");
if (null == sharedState) {
sharedState = createState();
}
if (markAsDirty) {
UI ui = getUI();
if (ui != null && !ui.getConnectorTracker().isDirty(this)
&& !ui.getConnectorTracker().isWritingResponse()) {
ui.getConnectorTracker().markDirty(this);
}
}
return sharedState;
}
@Override
public JsonObject encodeState() {
return LegacyCommunicationManager.encodeState(this, getState(false));
}
/**
* Creates the shared state bean to be used in server to client
* communication.
* <p>
* By default a state object of the defined return type of
* {@link #getState()} is created. Subclasses can override this method and
* return a new instance of the correct state class but this should rarely
* be necessary.
* </p>
* <p>
* No configuration of the values of the state should be performed in
* {@link #createState()}.
*
* @since 7.0
*
* @return new shared state object
*/
protected SharedState createState() {
try {
return getStateType().newInstance();
} catch (Exception e) {
throw new RuntimeException("Error creating state of type "
+ getStateType().getName() + " for " + getClass().getName(),
e);
}
}
@Override
public Class<? extends SharedState> getStateType() {
// Lazy load because finding type can be expensive because of the
// exceptions flying around
if (stateType == null) {
// Cache because we don't need to do this once per instance
stateType = stateTypeCache.get(this.getClass());
if (stateType == null) {
stateType = findStateType();
stateTypeCache.put(this.getClass(), stateType);
}
}
return stateType;
}
private Class<? extends SharedState> findStateType() {
try {
Class<?> class1 = getClass();
while (class1 != null) {
try {
Method m = class1.getDeclaredMethod("getState",
(Class[]) null);
Class<?> type = m.getReturnType();
if (!m.isSynthetic()) {
return type.asSubclass(SharedState.class);
}
} catch (NoSuchMethodException nsme) {
}
// Try in superclass instead
class1 = class1.getSuperclass();
}
throw new NoSuchMethodException(
getClass().getCanonicalName() + ".getState()");
} catch (Exception e) {
throw new RuntimeException(
"Error finding state type for " + getClass().getName(), e);
}
}
/**
* Returns an RPC proxy for a given server to client RPC interface for this
* component.
*
* TODO more javadoc, subclasses, ...
*
* @param rpcInterface
* RPC interface type
*
* @since 7.0
*/
protected <T extends ClientRpc> T getRpcProxy(final Class<T> rpcInterface) {
// create, initialize and return a dynamic proxy for RPC
try {
if (!rpcProxyMap.containsKey(rpcInterface)) {
Class<?> proxyClass = Proxy.getProxyClass(
rpcInterface.getClassLoader(), rpcInterface);
Constructor<?> constructor = proxyClass
.getConstructor(InvocationHandler.class);
T rpcProxy = rpcInterface.cast(constructor
.newInstance(new RpcInvocationHandler(rpcInterface)));
// cache the proxy
rpcProxyMap.put(rpcInterface, rpcProxy);
}
return (T) rpcProxyMap.get(rpcInterface);
} catch (Exception e) {
// TODO exception handling?
throw new RuntimeException(e);
}
}
private class RpcInvocationHandler
implements InvocationHandler, Serializable {
private final String rpcInterfaceName;
public RpcInvocationHandler(Class<?> rpcInterface) {
rpcInterfaceName = rpcInterface.getName().replaceAll("\\$", ".");
}
@Override
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
if (method.getDeclaringClass() == Object.class) {
// Don't add Object methods such as toString and hashCode as
// invocations
return method.invoke(this, args);
}
addMethodInvocationToQueue(rpcInterfaceName, method, args);
return null;
}
}
/**
* For internal use: adds a method invocation to the pending RPC call queue.
*
* @param interfaceName
* RPC interface name
* @param method
* RPC method
* @param parameters
* RPC all parameters
*
* @since 7.0
*/
protected void addMethodInvocationToQueue(String interfaceName,
Method method, Object[] parameters) {
// add to queue
pendingInvocations.add(new ClientMethodInvocation(this, interfaceName,
method, parameters));
// TODO no need to do full repaint if only RPC calls
requestRepaint();
}
@Override
public ServerRpcManager<?> getRpcManager(String rpcInterfaceName) {
return rpcManagerMap.get(rpcInterfaceName);
}
@Override
public List<ClientMethodInvocation> retrievePendingRpcCalls() {
if (pendingInvocations.isEmpty()) {
return Collections.emptyList();
} else {
List<ClientMethodInvocation> result = pendingInvocations;
pendingInvocations = new ArrayList<>();
return Collections.unmodifiableList(result);
}
}
@Override
public String getConnectorId() {
if (connectorId == null) {
if (getSession() == null) {
throw new RuntimeException(
"Component must be attached to a session when getConnectorId() is called for the first time");
}
connectorId = getSession().createConnectorId(this);
}
return connectorId;
}
/**
* Finds the {@link VaadinSession} to which this connector belongs. If the
* connector has not been attached, <code>null</code> is returned.
*
* @return The connector's session, or <code>null</code> if not attached
*/
protected VaadinSession getSession() {
UI uI = getUI();
if (uI == null) {
return null;
} else {
return uI.getSession();
}
}
/**
* Finds a UI ancestor of this connector. <code>null</code> is returned if
* no UI ancestor is found (typically because the connector is not attached
* to a proper hierarchy).
*
* @return the UI ancestor of this connector, or <code>null</code> if none
* is found.
*/
@Override
public UI getUI() {
ClientConnector connector = this;
while (connector != null) {
if (connector instanceof UI) {
return (UI) connector;
}
connector = connector.getParent();
}
return null;
}
private static Logger getLogger() {
return Logger.getLogger(AbstractClientConnector.class.getName());
}
/**
* @deprecated As of 7.0, use {@link #markAsDirtyRecursive()} instead
*/
@Override
@Deprecated
public void requestRepaintAll() {
markAsDirtyRecursive();
}
@Override
public void markAsDirtyRecursive() {
markAsDirty();
for (ClientConnector connector : getAllChildrenIterable(this)) {
connector.markAsDirtyRecursive();
}
}
/**
* Get an Iterable for iterating over all child connectors, including both
* extensions and child components.
*
* @param connector
* the connector to get children for
* @return an Iterable giving all child connectors.
*/
public static Iterable<? extends ClientConnector> getAllChildrenIterable(
final ClientConnector connector) {
Collection<Extension> extensions = connector.getExtensions();
boolean hasComponents = connector instanceof HasComponents;
boolean hasExtensions = extensions.size() > 0;
if (!hasComponents && !hasExtensions) {
// If has neither component nor extensions, return immutable empty
// list as iterable.
return Collections.emptyList();
}
if (hasComponents && !hasExtensions) {
// only components
return (HasComponents) connector;
}
if (!hasComponents && hasExtensions) {
// only extensions
return extensions;
}
// combine the iterators of extensions and components to a new iterable.
final Iterator<Component> componentsIterator = ((HasComponents) connector)
.iterator();
final Iterator<Extension> extensionsIterator = extensions.iterator();
Iterable<? extends ClientConnector> combinedIterable = () -> new Iterator<ClientConnector>() {
@Override
public boolean hasNext() {
return componentsIterator.hasNext()
|| extensionsIterator.hasNext();
}
@Override
public ClientConnector next() {
if (componentsIterator.hasNext()) {
return componentsIterator.next();
}
if (extensionsIterator.hasNext()) {
return extensionsIterator.next();
}
throw new NoSuchElementException();
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
return combinedIterable;
}
@Override
public Collection<Extension> getExtensions() {
return Collections.unmodifiableCollection(extensions);
}
/**
* Add an extension to this connector. This method is protected to allow
* extensions to select which targets they can extend.
*
* @param extension
* the extension to add
*/
protected void addExtension(Extension extension) {
ClientConnector previousParent = extension.getParent();
if (equals(previousParent)) {
// Nothing to do, already attached
return;
} else if (previousParent != null) {
throw new IllegalStateException(
"Moving an extension from one parent to another is not supported");
}
extensions.add(extension);
extension.setParent(this);
markAsDirty();
}
@Override
public void removeExtension(Extension extension) {
if (extension.getParent() != this) {
throw new IllegalArgumentException(
"This connector is not the parent for given extension");
}
extension.setParent(null);
extensions.remove(extension);
markAsDirty();
}
/*
* (non-Javadoc)
*
* @see com.vaadin.server.ClientConnector#isAttached()
*/
@Override
public boolean isAttached() {
return getSession() != null;
}
@Override
public void attach() {
markAsDirty();
getUI().getConnectorTracker().registerConnector(this);
for (ClientConnector connector : getAllChildrenIterable(this)) {
connector.attach();
}
fireEvent(new AttachEvent(this));
}
/**
* {@inheritDoc}
*
* <p>
* The {@link #getSession()} and {@link #getUI()} methods might return
* <code>null</code> after this method is called.
* </p>
*/
@Override
public void detach() {
for (ClientConnector connector : getAllChildrenIterable(this)) {
connector.detach();
}
fireEvent(new DetachEvent(this));
getUI().getConnectorTracker().unregisterConnector(this);
}
@Override
public boolean isConnectorEnabled() {
if (getParent() == null) {
// No parent -> the component cannot receive updates from the client
return false;
} else {
return getParent().isConnectorEnabled();
}
}
@Override
public void beforeClientResponse(boolean initial) {
// Do nothing by default
}
@Override
public boolean handleConnectorRequest(VaadinRequest request,
VaadinResponse response, String path) throws IOException {
DownloadStream stream = null;
String[] parts = path.split("/", 2);
String key = parts[0];
VaadinSession session = getSession();
session.lock();
try {
ConnectorResource resource = (ConnectorResource) getResource(key);
if (resource == null) {
return false;
}
stream = resource.getStream();
} finally {
session.unlock();
}
stream.writeResponse(request, response);
return true;
}
/**
* Gets a resource defined using {@link #setResource(String, Resource)} with
* the corresponding key.
*
* @param key
* the string identifier of the resource
* @return a resource, or <code>null</code> if there's no resource
* associated with the given key
*
* @see #setResource(String, Resource)
*/
protected Resource getResource(String key) {
return ResourceReference
.getResource(getState(false).resources.get(key));
}
/**
* Registers a resource with this connector using the given key. This will
* make the URL for retrieving the resource available to the client-side
* connector using
* {@link com.vaadin.terminal.gwt.client.ui.AbstractConnector#getResourceUrl(String)}
* with the same key.
*
* @param key
* the string key to associate the resource with
* @param resource
* the resource to set, or <code>null</code> to clear a previous
* association.
*/
protected void setResource(String key, Resource resource) {
ResourceReference resourceReference = ResourceReference.create(resource,
this, key);
if (resourceReference == null) {
getState().resources.remove(key);
} else {
getState().resources.put(key, resourceReference);
}
}
/* Listener code starts. Should be refactored. */
/**
* <p>
* Registers a new listener with the specified activation method to listen
* events generated by this component. If the activation method does not
* have any arguments the event object will not be passed to it when it's
* called.
* </p>
*
* <p>
* This method additionally informs the event-api to route events with the
* given eventIdentifier to the components handleEvent function call.
* </p>
*
* <p>
* For more information on the inheritable event mechanism see the
* {@link com.vaadin.event com.vaadin.event package documentation}.
* </p>
*
* @param eventIdentifier
* the identifier of the event to listen for
* @param eventType
* the type of the listened event. Events of this type or its
* subclasses activate the listener.
* @param target
* the object instance who owns the activation method.
* @param method
* the activation method.
* @return a registration object for removing the listener
* @since 8.0
*/
protected Registration addListener(String eventIdentifier,
Class<?> eventType, Object target, Method method) {
if (eventRouter == null) {
eventRouter = new EventRouter();
}
boolean needRepaint = !eventRouter.hasListeners(eventType);
Registration registration = eventRouter.addListener(eventType, target,
method);
if (needRepaint) {
ComponentStateUtil.addRegisteredEventListener(getState(),
eventIdentifier);
}
return registration;
}
/**
* Checks if the given {@link Event} type is listened for this component.
*
* @param eventType
* the event type to be checked
* @return true if a listener is registered for the given event type
*/
protected boolean hasListeners(Class<?> eventType) {
return eventRouter != null && eventRouter.hasListeners(eventType);
}
/**
* Removes all registered listeners matching the given parameters. Since
* this method receives the event type and the listener object as
* parameters, it will unregister all <code>object</code>'s methods that are
* registered to listen to events of type <code>eventType</code> generated
* by this component.
*
* <p>
* This method additionally informs the event-api to stop routing events
* with the given eventIdentifier to the components handleEvent function
* call.
* </p>
*
* <p>
* For more information on the inheritable event mechanism see the
* {@link com.vaadin.event com.vaadin.event package documentation}.
* </p>
*
* @param eventIdentifier
* the identifier of the event to stop listening for
* @param eventType
* the exact event type the <code>object</code> listens to.
* @param target
* the target object that has registered to listen to events of
* type <code>eventType</code> with one or more methods.
*
* @since 6.2
* @deprecated use a {@link Registration} from
* {@link #addListener(Class, Object, Method)} to remove a
* listener
*/
@Deprecated
protected void removeListener(String eventIdentifier, Class<?> eventType,
Object target) {
if (eventRouter != null) {
eventRouter.removeListener(eventType, target);
if (!eventRouter.hasListeners(eventType)) {
ComponentStateUtil.removeRegisteredEventListener(getState(),
eventIdentifier);
}
}
}
/**
* <p>
* Registers a new listener with the specified activation method to listen
* events generated by this component. If the activation method does not
* have any arguments the event object will not be passed to it when it's
* called.
* </p>
*
* <p>
* For more information on the inheritable event mechanism see the
* {@link com.vaadin.event com.vaadin.event package documentation}.
* </p>
*
* @param eventType
* the type of the listened event. Events of this type or its
* subclasses activate the listener.
* @param target
* the object instance who owns the activation method.
* @param method
* the activation method.
* @return a registration object for removing the listener
*/
@Override
public Registration addListener(Class<?> eventType, Object target,
Method method) {
if (eventRouter == null) {
eventRouter = new EventRouter();
}
return eventRouter.addListener(eventType, target, method);
}
/**
* <p>
* Convenience method for registering a new listener with the specified
* activation method to listen events generated by this component. If the
* activation method does not have any arguments the event object will not
* be passed to it when it's called.
* </p>
*
* <p>
* This version of <code>addListener</code> gets the name of the activation
* method as a parameter. The actual method is reflected from
* <code>object</code>, and unless exactly one match is found,
* <code>java.lang.IllegalArgumentException</code> is thrown.
* </p>
*
* <p>
* For more information on the inheritable event mechanism see the
* {@link com.vaadin.event com.vaadin.event package documentation}.
* </p>
*
* <p>
* Note: Using this method is discouraged because it cannot be checked
* during compilation. Use {@link #addListener(Class, Object, Method)} or
* {@link #addListener(String, Class, Object, Method) instead. </p>
*
* @param eventType
* the type of the listened event. Events of this type or its
* subclasses activate the listener.
* @param target
* the object instance who owns the activation method.
* @param methodName
* the name of the activation method.
* @return a registration object for removing the listener
* @deprecated As of 7.0. This method should be avoided. Use
* {@link #addListener(Class, Object, Method)} or
* {@link #addListener(String, Class, Object, Method)} instead.
* @since 8.0
*/
@Override
@Deprecated
public Registration addListener(Class<?> eventType, Object target,
String methodName) {
if (eventRouter == null) {
eventRouter = new EventRouter();
}
return eventRouter.addListener(eventType, target, methodName);
}
/**
* Removes all registered listeners matching the given parameters. Since
* this method receives the event type and the listener object as
* parameters, it will unregister all <code>object</code>'s methods that are
* registered to listen to events of type <code>eventType</code> generated
* by this component.
*
* <p>
* For more information on the inheritable event mechanism see the
* {@link com.vaadin.event com.vaadin.event package documentation}.
* </p>
*
* @param eventType
* the exact event type the <code>object</code> listens to.
* @param target
* the target object that has registered to listen to events of
* type <code>eventType</code> with one or more methods.
* @deprecated use a {@link Registration} from {@link #addListener} to
* remove a listener
*/
@Deprecated
@Override
public void removeListener(Class<?> eventType, Object target) {
if (eventRouter != null) {
eventRouter.removeListener(eventType, target);
}
}
/**
* Removes one registered listener method. The given method owned by the
* given object will no longer be called when the specified events are
* generated by this component.
*
* <p>
* For more information on the inheritable event mechanism see the
* {@link com.vaadin.event com.vaadin.event package documentation}.
* </p>
*
* @param eventType
* the exact event type the <code>object</code> listens to.
* @param target
* target object that has registered to listen to events of type
* <code>eventType</code> with one or more methods.
* @param method
* the method owned by <code>target</code> that's registered to
* listen to events of type <code>eventType</code>.
* @deprecated use a {@link Registration} from
* {@link #addListener(Class, Object, Method)} to remove a
* listener
*/
@Override
@Deprecated
public void removeListener(Class<?> eventType, Object target,
Method method) {
if (eventRouter != null) {
eventRouter.removeListener(eventType, target, method);
}
}
/**
* <p>
* Removes one registered listener method. The given method owned by the
* given object will no longer be called when the specified events are
* generated by this component.
* </p>
*
* <p>
* This version of <code>removeListener</code> gets the name of the
* activation method as a parameter. The actual method is reflected from
* <code>target</code>, and unless exactly one match is found,
* <code>java.lang.IllegalArgumentException</code> is thrown.
* </p>
*
* <p>
* For more information on the inheritable event mechanism see the
* {@link com.vaadin.event com.vaadin.event package documentation}.
* </p>
*
* @param eventType
* the exact event type the <code>object</code> listens to.
* @param target
* the target object that has registered to listen to events of
* type <code>eventType</code> with one or more methods.
* @param methodName
* the name of the method owned by <code>target</code> that's
* registered to listen to events of type <code>eventType</code>.
* @deprecated As of 7.0. This method should be avoided. Use
* {@link #removeListener(Class, Object, Method)} instead.
*/
@Deprecated
@Override
public void removeListener(Class<?> eventType, Object target,
String methodName) {
if (eventRouter != null) {
eventRouter.removeListener(eventType, target, methodName);
}
}
/**
* Returns all listeners that are registered for the given event type or one
* of its subclasses.
*
* @param eventType
* The type of event to return listeners for.
* @return A collection with all registered listeners. Empty if no listeners
* are found.
*/
public Collection<?> getListeners(Class<?> eventType) {
if (eventRouter == null) {
return Collections.emptyList();
}
return eventRouter.getListeners(eventType);
}
/**
* Sends the event to all listeners.
*
* @param event
* the Event to be sent to all listeners.
*/
protected void fireEvent(EventObject event) {
if (eventRouter != null) {
eventRouter.fireEvent(event);
}
}
/*
* (non-Javadoc)
*
* @see com.vaadin.server.ClientConnector#getErrorHandler()
*/
@Override
public ErrorHandler getErrorHandler() {
return errorHandler;
}
/*
* (non-Javadoc)
*
* @see com.vaadin.server.ClientConnector#setErrorHandler(com.vaadin.server.
* ErrorHandler)
*/
@Override
public void setErrorHandler(ErrorHandler errorHandler) {
this.errorHandler = errorHandler;
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
/*
* This equals method must return true when we're comparing an object to
* its proxy. This happens a lot with CDI (and possibly Spring) when
* we're injecting Components. See #14639
*/
if (obj instanceof AbstractClientConnector) {
AbstractClientConnector connector = (AbstractClientConnector) obj;
return connector.isThis(this);
}
return false;
}
/**
* For internal use only, may be changed or removed in future versions.
* <p>
* This method must be protected, because otherwise it will not be redefined
* by the proxy to actually be called on the underlying instance.
* <p>
* See #14639
*
* @deprecated only defined for framework hacks, do not use.
*/
@Deprecated
protected boolean isThis(Object that) {
return this == that;
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return super.hashCode();
}
/**
* Sets the expected value of a state property so that changes can be
* properly sent to the client. This needs to be done in cases where a state
* change originates from the client, since otherwise the server-side would
* fail to recognize if the value is changed back to its previous value.
*
* @param propertyName
* the name of the shared state property to update
* @param newValue
* the new diffstate reference value
*/
protected void updateDiffstate(String propertyName, JsonValue newValue) {
if (!isAttached()) {
return;
}
JsonObject diffState = getUI().getConnectorTracker().getDiffState(this);
if (diffState == null) {
return;
}
assert diffState.hasKey(propertyName) : "Diffstate for "
+ getClass().getName() + " has no property named "
+ propertyName;
diffState.put(propertyName, newValue);
}
}