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/*
* Copyright 2004-2022 Asterisk-Java contributors
*
* 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 org.asteriskjava.manager.internal;
import org.asteriskjava.manager.AsteriskMapping;
import org.asteriskjava.manager.event.*;
import org.asteriskjava.manager.util.EventAttributesHelper;
import org.asteriskjava.util.Log;
import org.asteriskjava.util.LogFactory;
import org.reflections.Reflections;
import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import java.util.*;
import java.util.Map.Entry;
/**
* Default implementation of the EventBuilder interface.
*
* @author srt
* @version $Id$
* @see org.asteriskjava.manager.event.ManagerEvent
*/
class EventBuilderImpl implements EventBuilder {
private static final Set ignoredAttributes = new HashSet<>(Arrays.asList("event"));
private Map> registeredEventClasses;
private final Set eventClassNegativeCache = new HashSet<>();
private static final Log logger = LogFactory.getLog(EventBuilderImpl.class);
private final static Set> knownManagerEventClasses = new Reflections(
"org.asteriskjava.manager.event").getSubTypesOf(ManagerEvent.class);
EventBuilderImpl() {
this.registeredEventClasses = new HashMap<>();
registerBuiltinEventClasses();
}
/**
* register the known ManagerEventClasses for this builder
*/
private void registerBuiltinEventClasses() {
for (Class managerEventClass : knownManagerEventClasses) {
if (!Modifier.isAbstract(managerEventClass.getModifiers())) {
registerEventClass(managerEventClass);
}
}
}
public final void registerEventClass(Class clazz) throws IllegalArgumentException {
String eventType;
AsteriskMapping annotation = clazz.getAnnotation(AsteriskMapping.class);
if (annotation == null) {
String className = clazz.getName();
eventType = className.substring(className.lastIndexOf('.') + 1).toLowerCase(Locale.ENGLISH);
if (eventType.endsWith("event")) {
eventType = eventType.substring(0, eventType.length() - "event".length());
}
} else {
eventType = annotation.value().toLowerCase(Locale.ENGLISH);
}
if (UserEvent.class.isAssignableFrom(clazz) && !eventType.startsWith("userevent")) {
eventType = "userevent" + eventType;
}
registerEventClass(eventType, clazz);
}
/**
* Registers a new event class for the event given by eventType.
*
* @param eventType the name of the event to register the class for. For
* example "Join".
* @param clazz the event class to register, must extend
* {@link ManagerEvent}.
* @throws IllegalArgumentException if clazz is not a valid event class.
*/
public final void registerEventClass(String eventType, Class clazz)
throws IllegalArgumentException {
Constructor defaultConstructor;
if (Modifier.isAbstract(clazz.getModifiers())) {
throw new IllegalArgumentException(clazz + " is abstract");
}
if (clazz.isInterface()) {
throw new IllegalArgumentException(clazz + " is abstract");
}
try {
defaultConstructor = clazz.getConstructor(Object.class);
if (!Modifier.isPublic(defaultConstructor.getModifiers())) {
throw new IllegalArgumentException(clazz + " has no public default constructor");
}
} catch (NoSuchMethodException ex) {
throw new IllegalArgumentException(clazz + " has no usable constructor");
}
registeredEventClasses.put(eventType.toLowerCase(Locale.US), clazz);
logger.debug("Registered event type '" + eventType + "' (" + clazz + ")");
}
@SuppressWarnings("unchecked")
public ManagerEvent buildEvent(Object source, Map attributes) {
ManagerEvent event;
String eventType = null;
Class eventClass;
Constructor constructor;
if (attributes.get("event") == null) {
logger.error("No event type in properties");
return null;
}
if (attributes.get("event") instanceof List) {
List eventNames = (List) attributes.get("event");
if (!eventNames.isEmpty() && "PeerEntry".equals(eventNames.get(0))) {
// List of PeerEntry events was received (AJ-329)
// Convert map of lists to list of maps - one map for each
// PeerEntry event
int peersAmount = attributes.get("listitems") != null
? Integer.parseInt((String) attributes.get("listitems"))
: eventNames.size() - 1; // Last event is
// PeerlistComplete
List> peersAttributes = new ArrayList<>();
for (Map.Entry attribute : attributes.entrySet()) {
String key = attribute.getKey();
Object value = attribute.getValue();
for (int i = 0; i < peersAmount; i++) {
Map peerAttrs;
if (peersAttributes.size() > i) {
peerAttrs = peersAttributes.get(i);
} else {
peerAttrs = new HashMap<>();
peersAttributes.add(i, peerAttrs);
}
if (value instanceof List) {
peerAttrs.put(key, ((List) value).get(i));
} else if (value instanceof String && !"listitems".equals(key)) {
peerAttrs.put(key, value);
}
}
}
attributes.put("peersAttributes", peersAttributes);
eventType = "peers";
}
} else {
if (!(attributes.get("event") instanceof String)) {
logger.error("Event type is not a String or List");
return null;
}
eventType = ((String) attributes.get("event")).toLowerCase(Locale.US);
// Change in Asterisk 1.4 where the name of the UserEvent is sent as
// property instead
// of the event name (AJ-48)
if ("userevent".equals(eventType)) {
String userEventType;
if (attributes.get("userevent") == null) {
logger.error("No user event type in properties");
return null;
}
if (!(attributes.get("userevent") instanceof String)) {
logger.error("User event type is not a String");
return null;
}
userEventType = ((String) attributes.get("userevent")).toLowerCase(Locale.US);
eventType = eventType + userEventType;
}
}
eventClass = registeredEventClasses.get(eventType);
if (eventClass == null) {
if (eventClassNegativeCache.add(eventType)) {
logger.info("No event class registered for event type '" + eventType + "', attributes: " + attributes
+ ". Please report at https://github.com/asterisk-java/asterisk-java/issues");
}
return null;
}
try {
constructor = eventClass.getConstructor(Object.class);
} catch (NoSuchMethodException ex) {
logger.error("Unable to get constructor of " + eventClass.getName(), ex);
return null;
}
try {
event = (ManagerEvent) constructor.newInstance(source);
} catch (Exception ex) {
logger.error("Unable to create new instance of " + eventClass.getName(), ex);
return null;
}
if (attributes.get("peersAttributes") != null && attributes.get("peersAttributes") instanceof List) {
// Fill Peers event with list of PeerEntry events (AJ-329)
PeersEvent peersEvent = (PeersEvent) event;
// TODO: This cast is very ugly, we should review how attributes are
// being passed around.
for (Map peerAttrs : (List>) attributes.get("peersAttributes")) {
PeerEntryEvent peerEntryEvent = new PeerEntryEvent(source);
EventAttributesHelper.setAttributes(peerEntryEvent, peerAttrs, ignoredAttributes);
List peerEntryEvents = peersEvent.getChildEvents();
if (peerEntryEvents == null) {
peerEntryEvents = new ArrayList<>();
peersEvent.setChildEvents(peerEntryEvents);
}
peerEntryEvents.add(peerEntryEvent);
}
peersEvent.setActionId(peersEvent.getChildEvents().get(0).getActionId());
} else {
EventAttributesHelper.setAttributes(event, attributes, ignoredAttributes);
}
// ResponseEvents are sent in response to a ManagerAction if the
// response contains lots of data. They include the actionId of
// the corresponding ManagerAction.
if (event instanceof ResponseEvent) {
ResponseEvent responseEvent;
String actionId;
responseEvent = (ResponseEvent) event;
actionId = responseEvent.getActionId();
if (actionId != null) {
responseEvent.setActionId(ManagerUtil.stripInternalActionId(actionId));
responseEvent.setInternalActionId(ManagerUtil.getInternalActionId(actionId));
}
}
return event;
}
@Override
public void deregisterEventClass(Class eventClass) {
Set toRemove = new HashSet<>();
for (Entry> registered : registeredEventClasses.entrySet()) {
if (registered.getValue().equals(eventClass)) {
toRemove.add(registered.getKey());
}
}
if (toRemove.isEmpty()) {
logger.warn("Couldn't remove event type " + eventClass);
} else {
for (String key : toRemove) {
registeredEventClasses.remove(key);
logger.warn("Removed event type " + key);
}
}
}
}