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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.drools.pooling;
import com.fasterxml.jackson.core.JsonProcessingException;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.onap.policy.common.endpoints.event.comm.Topic.CommInfrastructure;
import org.onap.policy.common.endpoints.event.comm.TopicListener;
import org.onap.policy.common.utils.properties.SpecProperties;
import org.onap.policy.drools.controller.DroolsController;
import org.onap.policy.drools.pooling.extractor.ClassExtractors;
import org.onap.policy.drools.pooling.message.BucketAssignments;
import org.onap.policy.drools.pooling.message.Forward;
import org.onap.policy.drools.pooling.message.Leader;
import org.onap.policy.drools.pooling.message.Message;
import org.onap.policy.drools.pooling.message.Offline;
import org.onap.policy.drools.pooling.state.ActiveState;
import org.onap.policy.drools.pooling.state.IdleState;
import org.onap.policy.drools.pooling.state.InactiveState;
import org.onap.policy.drools.pooling.state.QueryState;
import org.onap.policy.drools.pooling.state.StartState;
import org.onap.policy.drools.pooling.state.State;
import org.onap.policy.drools.pooling.state.StateTimerTask;
import org.onap.policy.drools.protocol.coders.EventProtocolCoder;
import org.onap.policy.drools.system.PolicyController;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Implementation of a {@link PoolingManager}. Until bucket assignments have been made,
* events coming from external topics are saved in a queue for later processing. Once
* assignments are made, the saved events are processed. In addition, while the controller
* is locked, events are still forwarded to other hosts and bucket assignments are still
* updated, based on any {@link Leader} messages that it receives.
*/
public class PoolingManagerImpl implements PoolingManager, TopicListener {
private static final Logger logger = LoggerFactory.getLogger(PoolingManagerImpl.class);
/**
* Maximum number of times a message can be forwarded.
*/
public static final int MAX_HOPS = 5;
/**
* ID of this host.
*/
private final String host;
/**
* Properties with which this was configured.
*/
private final PoolingProperties props;
/**
* Associated controller.
*/
private final PolicyController controller;
/**
* Where to offer events that have been forwarded to this host (i.e, the controller).
*/
private final TopicListener listener;
/**
* Decremented each time the manager enters the Active state. Used by junit tests.
*/
private final CountDownLatch activeLatch;
/**
* Used to encode & decode request objects received from & sent to a rule engine.
*/
private final Serializer serializer;
/**
* Internal DMaaP topic used by this controller.
*/
private final String topic;
/**
* Manager for the internal DMaaP topic.
*/
private final DmaapManager dmaapMgr;
/**
* Used to extract the request id from the decoded message.
*/
private final ClassExtractors extractors;
/**
* Lock used while updating {@link #current}. In general, public methods must use
* this, while private methods assume the lock is already held.
*/
private final Object curLocker = new Object();
/**
* Current state.
*
* <p>This uses a finite state machine, wherein the state object contains all of the data
* relevant to that state. Each state object has a process() method, specific to each
* type of {@link Message} subclass. The method returns the next state object, or
* {@code null} if the state is to remain the same.
*/
private State current;
/**
* Current bucket assignments or {@code null}.
*/
private BucketAssignments assignments = null;
/**
* Pool used to execute timers.
*/
private ScheduledThreadPoolExecutor scheduler = null;
/**
* {@code True} if events offered by the controller should be intercepted,
* {@code false} otherwise.
*/
private boolean intercept = true;
/**
* Constructs the manager, initializing all of the data structures.
*
* @param host name/uuid of this host
* @param controller controller with which this is associated
* @param props feature properties specific to the controller
* @param activeLatch latch to be decremented each time the manager enters the Active
* state
*/
public PoolingManagerImpl(String host, PolicyController controller, PoolingProperties props,
CountDownLatch activeLatch) {
this.host = host;
this.controller = controller;
this.props = props;
this.activeLatch = activeLatch;
try {
this.listener = (TopicListener) controller;
this.serializer = new Serializer();
this.topic = props.getPoolingTopic();
this.extractors = makeClassExtractors(makeExtractorProps(controller, props.getSource()));
this.dmaapMgr = makeDmaapManager(props.getPoolingTopic());
this.current = new IdleState(this);
logger.info("allocating host {} to controller {} for topic {}", host, controller.getName(), topic);
} catch (ClassCastException e) {
logger.error("not a topic listener, controller {}", controller.getName());
throw new PoolingFeatureRtException(e);
} catch (PoolingFeatureException e) {
logger.error("failed to attach internal DMaaP topic to controller {}", controller.getName());
throw new PoolingFeatureRtException(e);
}
}
/**
* Should only be used by junit tests.
*
* @return the current state
*/
protected State getCurrent() {
synchronized (curLocker) {
return current;
}
}
@Override
public String getHost() {
return host;
}
@Override
public String getTopic() {
return topic;
}
@Override
public PoolingProperties getProperties() {
return props;
}
/**
* Makes properties for configuring extractors.
*
* @param controller the controller for which the extractors will be configured
* @param source properties from which to get the extractor properties
* @return extractor properties
*/
private Properties makeExtractorProps(PolicyController controller, Properties source) {
return new SpecProperties(PoolingProperties.PROP_EXTRACTOR_PREFIX, controller.getName(), source);
}
/**
* Indicates that the controller is about to start. Starts the publisher for the
* internal topic, and creates a thread pool for the timers.
*/
public void beforeStart() {
synchronized (curLocker) {
if (scheduler == null) {
dmaapMgr.startPublisher();
logger.debug("make scheduler thread for topic {}", getTopic());
scheduler = makeScheduler();
/*
* Only a handful of timers at any moment, thus we can afford to take the
* time to remove them when they're cancelled.
*/
scheduler.setRemoveOnCancelPolicy(true);
scheduler.setMaximumPoolSize(1);
scheduler.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
scheduler.setContinueExistingPeriodicTasksAfterShutdownPolicy(false);
}
}
}
/**
* Indicates that the controller has successfully started. Starts the consumer for the
* internal topic, enters the {@link StartState}, and sets the filter for the initial
* state.
*/
public void afterStart() {
synchronized (curLocker) {
if (current instanceof IdleState) {
dmaapMgr.startConsumer(this);
changeState(new StartState(this));
}
}
}
/**
* Indicates that the controller is about to stop. Stops the consumer, the scheduler,
* and the current state.
*/
public void beforeStop() {
ScheduledThreadPoolExecutor sched;
synchronized (curLocker) {
sched = scheduler;
scheduler = null;
if (!(current instanceof IdleState)) {
changeState(new IdleState(this));
dmaapMgr.stopConsumer(this);
publishAdmin(new Offline(getHost()));
}
assignments = null;
}
if (sched != null) {
logger.debug("stop scheduler for topic {}", getTopic());
sched.shutdownNow();
}
}
/**
* Indicates that the controller has stopped. Stops the publisher and logs a warning
* if any events are still in the queue.
*/
public void afterStop() {
synchronized (curLocker) {
/*
* stop the publisher, but allow time for any Offline message to be
* transmitted
*/
dmaapMgr.stopPublisher(props.getOfflinePubWaitMs());
}
}
/**
* Indicates that the controller is about to be locked. Enters the idle state, as all
* it will be doing is forwarding messages.
*/
public void beforeLock() {
logger.info("locking manager for topic {}", getTopic());
synchronized (curLocker) {
changeState(new IdleState(this));
}
}
/**
* Indicates that the controller has been unlocked. Enters the start state, if the
* controller is running.
*/
public void afterUnlock() {
logger.info("unlocking manager for topic {}", getTopic());
synchronized (curLocker) {
if (controller.isAlive() && current instanceof IdleState && scheduler != null) {
changeState(new StartState(this));
}
}
}
/**
* Changes the finite state machine to a new state, provided the new state is not
* {@code null}.
*
* @param newState new state, or {@code null} if to remain unchanged
*/
private void changeState(State newState) {
if (newState != null) {
current.cancelTimers();
current = newState;
// set the filter before starting the state
setFilter(newState.getFilter());
newState.start();
}
}
/**
* Sets the server-side filter for the internal topic.
*
* @param filter new filter to be used
*/
private void setFilter(Map<String, Object> filter) {
try {
dmaapMgr.setFilter(serializer.encodeFilter(filter));
} catch (JsonProcessingException e) {
logger.error("failed to encode server-side filter for topic {}, {}", topic, filter, e);
} catch (PoolingFeatureException e) {
logger.error("failed to set server-side filter for topic {}, {}", topic, filter, e);
}
}
@Override
public CancellableScheduledTask schedule(long delayMs, StateTimerTask task) {
// wrap the task in a TimerAction and schedule it
ScheduledFuture<?> fut = scheduler.schedule(new TimerAction(task), delayMs, TimeUnit.MILLISECONDS);
// wrap the future in a "CancellableScheduledTask"
return () -> fut.cancel(false);
}
@Override
public CancellableScheduledTask scheduleWithFixedDelay(long initialDelayMs, long delayMs, StateTimerTask task) {
// wrap the task in a TimerAction and schedule it
ScheduledFuture<?> fut = scheduler.scheduleWithFixedDelay(new TimerAction(task), initialDelayMs, delayMs,
TimeUnit.MILLISECONDS);
// wrap the future in a "CancellableScheduledTask"
return () -> fut.cancel(false);
}
@Override
public void publishAdmin(Message msg) {
publish(Message.ADMIN, msg);
}
@Override
public void publish(String channel, Message msg) {
logger.info("publish {} to {} on topic {}", msg.getClass().getSimpleName(), channel, getTopic());
msg.setChannel(channel);
try {
// ensure it's valid before we send it
msg.checkValidity();
String txt = serializer.encodeMsg(msg);
dmaapMgr.publish(txt);
} catch (JsonProcessingException e) {
logger.error("failed to serialize message for topic {} channel {}", topic, channel, e);
} catch (PoolingFeatureException e) {
logger.error("failed to publish message for topic {} channel {}", topic, channel, e);
}
}
/**
* Handles an event from the internal topic.
*
* @param commType comm infrastructure
* @param topic2 topic
* @param event event
*/
@Override
public void onTopicEvent(CommInfrastructure commType, String topic2, String event) {
if (event == null) {
logger.error("null event on topic {}", topic);
return;
}
synchronized (curLocker) {
// it's on the internal topic
handleInternal(event);
}
}
/**
* Called by the PolicyController before it offers the event to the DroolsController.
* If the controller is locked, then it isn't processing events. However, they still
* need to be forwarded, thus in that case, they are decoded and forwarded.
*
* <p>On the other hand, if the controller is not locked, then we just return immediately
* and let {@link #beforeInsert(Object, String, String, Object) beforeInsert()} handle
* it instead, as it already has the decoded message.
*
* @param protocol protocol
* @param topic2 topic
* @param event event
* @return {@code true} if the event was handled by the manager, {@code false} if it
* must still be handled by the invoker
*/
public boolean beforeOffer(CommInfrastructure protocol, String topic2, String event) {
if (!controller.isLocked() || !intercept) {
// we should NOT intercept this message - let the invoker handle it
return false;
}
return handleExternal(protocol, topic2, event, extractRequestId(decodeEvent(topic2, event)));
}
/**
* Called by the DroolsController before it inserts the event into the rule engine.
*
* @param protocol protocol
* @param topic2 topic
* @param event original event text, as received from the Bus
* @param event2 event, as an object
* @return {@code true} if the event was handled by the manager, {@code false} if it
* must still be handled by the invoker
*/
public boolean beforeInsert(CommInfrastructure protocol, String topic2, String event, Object event2) {
if (!intercept) {
// we should NOT intercept this message - let the invoker handle it
return false;
}
return handleExternal(protocol, topic2, event, extractRequestId(event2));
}
/**
* Handles an event from an external topic.
*
* @param protocol protocol
* @param topic2 topic
* @param event event
* @param reqid request id extracted from the event, or {@code null} if it couldn't be
* extracted
* @return {@code true} if the event was handled by the manager, {@code false} if it
* must still be handled by the invoker
*/
private boolean handleExternal(CommInfrastructure protocol, String topic2, String event, String reqid) {
if (reqid == null) {
// no request id - let the invoker handle it
return false;
}
if (reqid.isEmpty()) {
logger.warn("handle locally due to empty request id for topic {}", topic2);
// no request id - let the invoker handle it
return false;
}
Forward ev = makeForward(protocol, topic2, event, reqid);
if (ev == null) {
// invalid args - consume the message
logger.warn("constructed an invalid Forward message on topic {}", getTopic());
return true;
}
synchronized (curLocker) {
return handleExternal(ev);
}
}
/**
* Handles an event from an external topic.
*
* @param event event
* @return {@code true} if the event was handled, {@code false} if the invoker should
* handle it
*/
private boolean handleExternal(Forward event) {
if (assignments == null) {
// no bucket assignments yet - handle locally
logger.info("handle event locally for request {}", event.getRequestId());
// we did NOT consume the event
return false;
} else {
return handleEvent(event);
}
}
/**
* Handles a {@link Forward} event, possibly forwarding it again.
*
* @param event event
* @return {@code true} if the event was handled, {@code false} if the invoker should
* handle it
*/
private boolean handleEvent(Forward event) {
String target = assignments.getAssignedHost(event.getRequestId().hashCode());
if (target == null) {
/*
* This bucket has no assignment - just discard the event
*/
logger.warn("discarded event for unassigned bucket from topic {}", event.getTopic());
return true;
}
if (target.equals(host)) {
/*
* Message belongs to this host - allow the controller to handle it.
*/
logger.info("handle local event for request {} from topic {}", event.getRequestId(), event.getTopic());
return false;
}
// forward to a different host, if hop count has been exhausted
if (event.getNumHops() > MAX_HOPS) {
logger.warn("message discarded - hop count {} exceeded {} for topic {}", event.getNumHops(), MAX_HOPS,
topic);
} else {
logger.info("forward event hop-count={} from topic {}", event.getNumHops(), event.getTopic());
event.bumpNumHops();
publish(target, event);
}
// either way, consume the event
return true;
}
/**
* Extract the request id from an event object.
*
* @param event the event object, or {@code null}
* @return the event's request id, or {@code null} if it can't be extracted
*/
private String extractRequestId(Object event) {
if (event == null) {
return null;
}
Object reqid = extractors.extract(event);
return (reqid != null ? reqid.toString() : null);
}
/**
* Decodes an event from a String into an event Object.
*
* @param topic2 topic
* @param event event
* @return the decoded event object, or {@code null} if it can't be decoded
*/
private Object decodeEvent(String topic2, String event) {
DroolsController drools = controller.getDrools();
// check if this topic has a decoder
if (!canDecodeEvent(drools, topic2)) {
logger.warn("{}: DECODING-UNSUPPORTED {}:{}:{}", drools, topic2, drools.getGroupId(),
drools.getArtifactId());
return null;
}
// decode
try {
return decodeEventWrapper(drools, topic2, event);
} catch (UnsupportedOperationException | IllegalStateException | IllegalArgumentException e) {
logger.debug("{}: DECODE FAILED: {} <- {} because of {}", drools, topic2, event, e.getMessage(), e);
return null;
}
}
/**
* Makes a {@link Forward}, and validates its contents.
*
* @param protocol protocol
* @param topic2 topic
* @param event event
* @param reqid request id
* @return a new message, or {@code null} if the message was invalid
*/
private Forward makeForward(CommInfrastructure protocol, String topic2, String event, String reqid) {
try {
Forward ev = new Forward(host, protocol, topic2, event, reqid);
// required for the validity check
ev.setChannel(host);
ev.checkValidity();
return ev;
} catch (PoolingFeatureException e) {
logger.error("invalid message for topic {}", topic2, e);
return null;
}
}
@Override
public void handle(Forward event) {
synchronized (curLocker) {
if (!handleExternal(event)) {
// this host should handle it - inject it
inject(event);
}
}
}
/**
* Injects an event into the controller.
*
* @param event event
*/
private void inject(Forward event) {
logger.info("inject event for request {} from topic {}", event.getRequestId(), event.getTopic());
try {
intercept = false;
listener.onTopicEvent(event.getProtocol(), event.getTopic(), event.getPayload());
} finally {
intercept = true;
}
}
/**
* Handles an event from the internal topic. This uses reflection to identify the
* appropriate process() method to invoke, based on the type of Message that was
* decoded.
*
* @param event the serialized {@link Message} read from the internal topic
*/
private void handleInternal(String event) {
Class<?> clazz = null;
try {
Message msg = serializer.decodeMsg(event);
// get the class BEFORE checking the validity
clazz = msg.getClass();
msg.checkValidity();
Method meth = current.getClass().getMethod("process", msg.getClass());
changeState((State) meth.invoke(current, msg));
} catch (IOException e) {
logger.warn("failed to decode message for topic {}", topic, e);
} catch (NoSuchMethodException | SecurityException e) {
logger.error("no processor for message {} for topic {}", clazz, topic, e);
} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException
| PoolingFeatureException e) {
logger.error("failed to process message {} for topic {}", clazz, topic, e);
}
}
@Override
public void startDistributing(BucketAssignments asgn) {
synchronized (curLocker) {
int sz = (asgn == null ? 0 : asgn.getAllHosts().size());
logger.info("new assignments for {} hosts on topic {}", sz, getTopic());
assignments = asgn;
}
}
@Override
public BucketAssignments getAssignments() {
return assignments;
}
@Override
public State goStart() {
return new StartState(this);
}
@Override
public State goQuery() {
return new QueryState(this);
}
@Override
public State goActive() {
activeLatch.countDown();
return new ActiveState(this);
}
@Override
public State goInactive() {
return new InactiveState(this);
}
/**
* Action to run a timer task. Only runs the task if the machine is still in the state
* that it was in when the timer was created.
*/
private class TimerAction implements Runnable {
/**
* State of the machine when the timer was created.
*/
private State origState;
/**
* Task to be executed.
*/
private StateTimerTask task;
/**
* Constructor.
*
* @param task task to execute when this timer runs
*/
public TimerAction(StateTimerTask task) {
this.origState = current;
this.task = task;
}
@Override
public void run() {
synchronized (curLocker) {
if (current == origState) {
changeState(task.fire());
}
}
}
}
/*
* The remaining methods may be overridden by junit tests.
*/
/**
* Creates object extractors.
*
* @param props properties used to configure the extractors
* @return a new set of extractors
*/
protected ClassExtractors makeClassExtractors(Properties props) {
return new ClassExtractors(props, PoolingProperties.PROP_EXTRACTOR_PREFIX,
PoolingProperties.EXTRACTOR_TYPE);
}
/**
* Creates a DMaaP manager.
*
* @param topic name of the internal DMaaP topic
* @return a new DMaaP manager
* @throws PoolingFeatureException if an error occurs
*/
protected DmaapManager makeDmaapManager(String topic) throws PoolingFeatureException {
return new DmaapManager(topic);
}
/**
* Creates a scheduled thread pool.
*
* @return a new scheduled thread pool
*/
protected ScheduledThreadPoolExecutor makeScheduler() {
return new ScheduledThreadPoolExecutor(1);
}
/**
* Determines if the event can be decoded.
*
* @param drools drools controller
* @param topic topic on which the event was received
* @return {@code true} if the event can be decoded, {@code false} otherwise
*/
protected boolean canDecodeEvent(DroolsController drools, String topic) {
return EventProtocolCoder.manager.isDecodingSupported(drools.getGroupId(), drools.getArtifactId(), topic);
}
/**
* Decodes the event.
*
* @param drools drools controller
* @param topic topic on which the event was received
* @param event event text to be decoded
* @return the decoded event
* @throws IllegalArgumentException illegal argument
* @throw UnsupportedOperationException unsupported operation
* @throws IllegalStateException illegal state
*/
protected Object decodeEventWrapper(DroolsController drools, String topic, String event) {
return EventProtocolCoder.manager.decode(drools.getGroupId(), drools.getArtifactId(), topic, event);
}
}
|