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The free Java library for Asterisk PBX integration.
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/*
* Copyright 2004-2006 Stefan Reuter
*
* 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 com.google.common.util.concurrent.RateLimiter;
import org.asteriskjava.manager.event.DisconnectEvent;
import org.asteriskjava.manager.event.ManagerEvent;
import org.asteriskjava.manager.event.ProtocolIdentifierReceivedEvent;
import org.asteriskjava.manager.internal.backwardsCompatibility.BackwardsCompatibilityForManagerEvents;
import org.asteriskjava.manager.response.ManagerResponse;
import org.asteriskjava.pbx.util.LogTime;
import org.asteriskjava.util.DateUtil;
import org.asteriskjava.util.Log;
import org.asteriskjava.util.LogFactory;
import org.asteriskjava.util.SocketConnectionFacade;
import java.io.IOException;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
/**
* Default implementation of the ManagerReader interface.
*
* @author srt
* @version $Id$
*/
public class ManagerReaderImpl implements ManagerReader {
/**
* Instance logger.
*/
private final Log logger = LogFactory.getLog(getClass());
/**
* The event builder utility to convert a map of attributes reveived from
* asterisk to instances of registered event classes.
*/
private final EventBuilder eventBuilder;
/**
* The response builder utility to convert a map of attributes reveived from
* asterisk to instances of well known response classes.
*/
private final ResponseBuilder responseBuilder;
private final Map> expectedResponseClasses;
/**
* The source to use when creating {@link ManagerEvent}s.
*/
private final Object source;
/**
* The socket to use for reading from the asterisk server.
*/
private SocketConnectionFacade socket;
/**
* If set to true, terminates and closes the reader.
*/
private volatile boolean die = false;
/**
* true if the main loop has finished.
*/
private boolean dead = false;
/**
* Exception that caused this reader to terminate if any.
*/
private IOException terminationException;
/**
* set of classes able to take newer versions of ManagerEvents and emit
* older style manager Events
*/
BackwardsCompatibilityForManagerEvents compatibility = new BackwardsCompatibilityForManagerEvents();
private final Dispatcher rawDispatcher;
/**
* Creates a new ManagerReaderImpl.
*
* @param dispatcher the dispatcher to use for dispatching events and
* responses.
* @param source the source to use when creating {@link ManagerEvent}s
*/
public ManagerReaderImpl(final Dispatcher dispatcher, Object source) {
this.rawDispatcher = dispatcher;
this.source = source;
this.eventBuilder = new EventBuilderImpl();
this.responseBuilder = new ResponseBuilderImpl();
this.expectedResponseClasses = new ConcurrentHashMap<>();
}
/**
* Sets the socket to use for reading from the asterisk server.
*
* @param socket the socket to use for reading from the asterisk server.
*/
public void setSocket(final SocketConnectionFacade socket) {
this.socket = socket;
}
public void registerEventClass(Class eventClass) {
eventBuilder.registerEventClass(eventClass);
}
public void expectResponseClass(String internalActionId, Class responseClass) {
expectedResponseClasses.put(internalActionId, responseClass);
}
/**
* Reads line by line from the asterisk server, sets the protocol identifier
* (using a generated
* {@link org.asteriskjava.manager.event.ProtocolIdentifierReceivedEvent})
* as soon as it is received and dispatches the received events and
* responses via the associated dispatcher.
*
* @see org.asteriskjava.manager.internal.Dispatcher#dispatchEvent(ManagerEvent)
* @see org.asteriskjava.manager.internal.Dispatcher#dispatchResponse(ManagerResponse)
*/
public void run() {
long timeOfLastEvent = 0;
long reserve = 0;
final Map buffer = new HashMap<>();
String line;
if (socket == null) {
throw new IllegalStateException("Unable to run: socket is null.");
}
this.die = false;
this.dead = false;
AsyncEventPump dispatcher = new AsyncEventPump(this, rawDispatcher, Thread.currentThread().getName());
long slowEventThresholdMs = 10;
RateLimiter slowEventLogLimiter = RateLimiter.create(4);
try {
// main loop
while (!this.die && (line = socket.readLine()) != null) {
// maybe we will find a better way to identify the protocol
// identifier but for now
// this works quite well.
if (line.startsWith("Asterisk Call Manager/") || line.startsWith("Asterisk Call Manager Proxy/")
|| line.startsWith("Asterisk Manager Proxy/") || line.startsWith("OpenPBX Call Manager/")
|| line.startsWith("CallWeaver Call Manager/")) {
ProtocolIdentifierReceivedEvent protocolIdentifierReceivedEvent;
protocolIdentifierReceivedEvent = new ProtocolIdentifierReceivedEvent(source);
protocolIdentifierReceivedEvent.setProtocolIdentifier(line);
protocolIdentifierReceivedEvent.setDateReceived(DateUtil.getDate());
dispatcher.dispatchEvent(protocolIdentifierReceivedEvent, null);
continue;
}
/*
* Special handling for "Response: Follows" (CommandResponse) As
* we are using "\r\n" as the delimiter for line this also
* handles multiline results as long as they only contain "\n".
*/
if ("Follows".equals(buffer.get("response")) && line.endsWith("--END COMMAND--")) {
buffer.put(COMMAND_RESULT_RESPONSE_KEY, line);
continue;
}
if (line.length() > 0) {
// begin of workaround for Astersik bug 13319
// see AJ-77
// Use this workaround only when line starts from "From "
// and "To "
int isFromAtStart = line.indexOf("From ");
int isToAtStart = line.indexOf("To ");
int delimiterIndex = isFromAtStart == 0 || isToAtStart == 0 ? line.indexOf(" ") : line.indexOf(":");
// end of workaround for Astersik bug 13319
int delimiterLength = 1;
if (delimiterIndex > 0 && line.length() > delimiterIndex + delimiterLength) {
String name = line.substring(0, delimiterIndex).toLowerCase(Locale.ENGLISH).trim();
String value = line.substring(delimiterIndex + delimiterLength).trim();
addToBuffer(buffer, name, value);
// TODO tracing
// logger.debug("Got name [" + name + "], value: [" +
// value + "]");
}
}
// an empty line indicates a normal response's or event's end so
// we build
// the corresponding value object and dispatch it through the
// ManagerConnection.
if (line.length() == 0) {
Object cause = null;
LogTime timer = new LogTime();
if (buffer.containsKey("event")) {
// TODO tracing
// logger.debug("attempting to build event: " +
// buffer.get("event"));
ManagerEvent event = buildEvent(source, buffer);
if (event != null) {
cause = event;
dispatcher.dispatchEvent(event, null);
// Backwards compatibility for bridge events.
// Asterisk 13 uses BridgeCreate,
// BridgeEnter, BridgeLeave and BridgeDestroy
// events.
// So here we track active bridges and simulate
// BridgeEvent's for them allowing legacy code to
// still work with BridgeEvent's
ManagerEvent secondaryEvent = compatibility.handleEvent(event);
if (secondaryEvent != null) {
dispatcher.dispatchEvent(secondaryEvent, null);
}
} else {
logger.debug("buildEvent returned null");
}
} else if (buffer.containsKey("response")) {
ManagerResponse response = buildResponse(buffer);
// TODO tracing
// logger.debug("attempting to build response");
if (response != null) {
cause = response;
dispatcher.dispatchResponse(response, null);
}
} else {
if (!buffer.isEmpty()) {
logger.debug("Buffer contains neither response nor event");
}
}
buffer.clear();
// some math to determine if events are being processed
// slowly
long elapsed = timer.timeTaken();
long now = System.currentTimeMillis();
long add = now - timeOfLastEvent;
// double the elapsed time, this allows 50% slack. Also note
// that we
// would never be able to exhaust the reserve if we don't
// artificially increase the elapsed time. I'd have probably
// gone for 1.3 but I am trying to avoid floating point math
reserve = (reserve + add) - (elapsed * 2);
// don't allow reserve to exceed 500 ms
reserve = Math.min(500, reserve);
// don't allow reserve to go negative, otherwise we might
// accrue a large debt
reserve = Math.max(0, reserve);
timeOfLastEvent = now;
// check if the event was slow to build and dispatch
if (elapsed > slowEventThresholdMs) {
// check for to many slow events this second.
if (reserve <= 0) {
// check we haven't already logged this to often
if (slowEventLogLimiter.tryAcquire()) {
logger.warn("(This is normal during JVM warmup) Slow processing of event " + elapsed + "\n"
+ cause);
}
}
}
}
}
this.dead = true;
logger.debug("Reached end of stream, terminating reader.");
} catch (IOException e) {
this.terminationException = e;
this.dead = true;
logger.info("Terminating reader thread: " + e.getMessage());
} catch (Exception e) {
if (this.terminationException == null) {
// wrap in IOException to avoid changing the external API of
// asteriskjava
this.terminationException = new IOException(e);
}
logger.error("Manager reader exiting due to unexpected Exception...");
logger.error(e, e);
} finally {
this.dead = true;
// cleans resources and reconnects if needed
DisconnectEvent disconnectEvent = new DisconnectEvent(source);
disconnectEvent.setDateReceived(DateUtil.getDate());
dispatcher.dispatchEvent(disconnectEvent, null);
dispatcher.stop();
}
}
@SuppressWarnings("unchecked")
private void addToBuffer(Map buffer, String name, String value) {
// if we already have a value for that key, convert the value to a list
// and add
// the new value to that list.
if (buffer.containsKey(name)) {
Object currentValue = buffer.get(name);
if (currentValue instanceof List) {
((List) currentValue).add(value);
return;
}
List list = new ArrayList<>();
if (currentValue instanceof String) {
list.add((String) currentValue);
} else {
list.add(currentValue.toString());
}
list.add(value);
buffer.put(name, list);
} else {
buffer.put(name, value);
}
}
public void die() {
this.die = true;
}
public boolean isDead() {
return dead;
}
public IOException getTerminationException() {
return terminationException;
}
private ManagerResponse buildResponse(Map buffer) {
Class responseClass = null;
final String actionId = (String) buffer.get("actionid");
final String internalActionId = ManagerUtil.getInternalActionId(actionId);
if (internalActionId != null) {
responseClass = expectedResponseClasses.remove(internalActionId);
}
final ManagerResponse response = responseBuilder.buildResponse(responseClass, buffer);
if (response != null) {
response.setDateReceived(DateUtil.getDate());
}
return response;
}
private ManagerEvent buildEvent(Object source, Map buffer) {
ManagerEvent event;
event = eventBuilder.buildEvent(source, buffer);
if (event != null) {
event.setDateReceived(DateUtil.getDate());
}
return event;
}
@Override
public void deregisterEventClass(Class eventClass) {
eventBuilder.deregisterEventClass(eventClass);
}
}