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/*
* ============LICENSE_START=======================================================
* policy-management
* ================================================================================
* Copyright (C) 2017-2019 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.system;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import org.onap.policy.common.capabilities.Lockable;
import org.onap.policy.common.capabilities.Startable;
import org.onap.policy.common.endpoints.event.comm.Topic;
import org.onap.policy.common.endpoints.event.comm.Topic.CommInfrastructure;
import org.onap.policy.common.endpoints.event.comm.TopicEndpoint;
import org.onap.policy.common.endpoints.event.comm.TopicListener;
import org.onap.policy.common.endpoints.event.comm.TopicSink;
import org.onap.policy.common.endpoints.event.comm.TopicSource;
import org.onap.policy.common.endpoints.http.server.HttpServletServer;
import org.onap.policy.common.endpoints.http.server.HttpServletServerFactory;
import org.onap.policy.common.endpoints.properties.PolicyEndPointProperties;
import org.onap.policy.common.gson.annotation.GsonJsonIgnore;
import org.onap.policy.common.gson.annotation.GsonJsonProperty;
import org.onap.policy.drools.controller.DroolsController;
import org.onap.policy.drools.core.PolicyContainer;
import org.onap.policy.drools.core.jmx.PdpJmxListener;
import org.onap.policy.drools.features.PolicyControllerFeatureAPI;
import org.onap.policy.drools.features.PolicyEngineFeatureAPI;
import org.onap.policy.drools.persistence.SystemPersistence;
import org.onap.policy.drools.properties.DroolsProperties;
import org.onap.policy.drools.protocol.coders.EventProtocolCoder;
import org.onap.policy.drools.protocol.configuration.ControllerConfiguration;
import org.onap.policy.drools.protocol.configuration.PdpdConfiguration;
import org.onap.policy.drools.server.restful.RestManager;
import org.onap.policy.drools.server.restful.aaf.AafTelemetryAuthFilter;
import org.onap.policy.drools.utils.logging.LoggerUtil;
import org.onap.policy.drools.utils.logging.MDCTransaction;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Policy Engine, the top abstraction for the Drools PDP Policy Engine. It abstracts away a Drools
* PDP Engine from management purposes. This is the best place to looking at the code from a top
* down approach. Other managed entities can be obtained from the PolicyEngine, hierarchically. <br>
* PolicyEngine 1 --- * PolicyController 1 --- 1 DroolsController 1 --- 1 PolicyContainer 1 --- *
* PolicySession <br> PolicyEngine 1 --- 1 TopicEndpointManager 1 -- * TopicReader 1 --- 1
* UebTopicReader <br> PolicyEngine 1 --- 1 TopicEndpointManager 1 -- * TopicReader 1 --- 1
* DmaapTopicReader <br> PolicyEngine 1 --- 1 TopicEndpointManager 1 -- * TopicWriter 1 --- 1
* DmaapTopicWriter <br> PolicyEngine 1 --- 1 TopicEndpointManager 1 -- * TopicReader 1 --- 1
* RestTopicReader <br> PolicyEngine 1 --- 1 TopicEndpointManager 1 -- * TopicWriter 1 --- 1
* RestTopicWriter <br> PolicyEngine 1 --- 1 ManagementServer
*/
public interface PolicyEngine extends Startable, Lockable, TopicListener {
/**
* Policy Engine Manager.
*/
PolicyEngine manager = new PolicyEngineManager();
/**
* Default Telemetry Server Port.
*/
int TELEMETRY_SERVER_DEFAULT_PORT = 9696;
/**
* Default Telemetry Server Hostname.
*/
String TELEMETRY_SERVER_DEFAULT_HOST = "localhost";
/**
* Default Telemetry Server Name.
*/
String TELEMETRY_SERVER_DEFAULT_NAME = "TELEMETRY";
/**
* Boot the engine.
*
* @param cliArgs command line arguments
*/
void boot(String[] cliArgs);
/**
* configure the policy engine according to the given properties.
*
* @param properties Policy Engine properties
* @throws IllegalArgumentException when invalid or insufficient properties are provided
*/
void configure(Properties properties);
/**
* updates the Policy Engine with the given configuration.
*
* @param configuration the configuration
* @return success or failure
* @throws IllegalArgumentException if invalid argument provided
* @throws IllegalStateException if the system is in an invalid state
*/
boolean configure(PdpdConfiguration configuration);
/**
* configure the engine's environment. General lab installation configuration is made available
* to the Engine. Typically, custom lab installation that may be needed by arbitrary drools
* applications are made available, for example network component and database host addresses.
* Multiple environments can be passed in and tracked by the engine.
*
* @param properties an environment properties
*/
void setEnvironment(Properties properties);
/**
* gets the engine's environment.
*
* @return properties object
*/
Properties getEnvironment();
/**
* gets an environment's value, by 1) first from the engine's environment, and 2) from the OS
* environment.
*
* @param key environment key
* @return environment value or null if absent
*/
String getEnvironmentProperty(String key);
/**
* sets an engine's environment property.
*
* @param key key
* @param value value
* @return property string
*/
String setEnvironmentProperty(String key, String value);
/**
* registers a new Policy Controller with the Policy Engine initialized per properties.
*
* @param properties properties to initialize the Policy Controller
* @return the newly instantiated Policy Controller
* @throws IllegalArgumentException when invalid or insufficient properties are provided
* @throws IllegalStateException when the engine is in a state where this operation is not
* permitted.
*/
PolicyController createPolicyController(String name, Properties properties);
/**
* updates a set of Policy Controllers with configuration information.
*
* @param configuration list of configurations
* @return list of controllers
* @throws IllegalArgumentException exception
* @throws IllegalStateException exception
*/
List<PolicyController> updatePolicyControllers(List<ControllerConfiguration> configuration);
/**
* updates an already existing Policy Controller with configuration information.
*
* @param configuration configuration
* @return the updated Policy Controller
* @throws IllegalArgumentException in the configuration is invalid
* @throws IllegalStateException if the controller is in a bad state
* @throws Exception any other reason
*/
PolicyController updatePolicyController(ControllerConfiguration configuration);
/**
* removes the Policy Controller identified by its name from the Policy Engine.
*
* @param name name of the Policy Controller
*/
void removePolicyController(String name);
/**
* removes a Policy Controller from the Policy Engine.
*
* @param controller the Policy Controller to remove from the Policy Engine
*/
void removePolicyController(PolicyController controller);
/**
* returns a list of the available Policy Controllers.
*
* @return list of Policy Controllers
*/
List<PolicyController> getPolicyControllers();
/**
* get policy controller names.
*
* @return list of controller names
*/
List<String> getPolicyControllerIds();
/**
* get unmanaged sources.
*
* @return unmanaged sources
*/
List<TopicSource> getSources();
/**
* get unmanaged sinks.
*
* @return unmanaged sinks
*/
List<TopicSink> getSinks();
/**
* get unmmanaged http servers list.
*
* @return http servers
*/
List<HttpServletServer> getHttpServers();
/**
* get properties configuration.
*
* @return properties objects
*/
Properties getProperties();
/**
* get features attached to the Policy Engine.
*
* @return list of features
*/
List<PolicyEngineFeatureAPI> getFeatureProviders();
/**
* get named feature attached to the Policy Engine.
*
* @return the feature
*/
PolicyEngineFeatureAPI getFeatureProvider(String featureName);
/**
* get features attached to the Policy Engine.
*
* @return list of features
*/
List<String> getFeatures();
/**
* Attempts the dispatching of an "event" object.
*
* @param topic topic
* @param event the event object to send
* @return true if successful, false if a failure has occurred.
* @throws IllegalArgumentException when invalid or insufficient properties are provided
* @throws IllegalStateException when the engine is in a state where this operation is not
* permitted (ie. locked or stopped).
*/
boolean deliver(String topic, Object event);
/**
* Attempts the dispatching of an "event" object over communication infrastructure "busType".
*
* @param topic topic
* @param event the event object to send
* @return true if successful, false if a failure has occurred.
* @throws IllegalArgumentException when invalid or insufficient properties are provided
* @throws IllegalStateException when the engine is in a state where this operation is not
* permitted (ie. locked or stopped).
* @throws UnsupportedOperationException when the engine cannot deliver due to the functionality
* missing (ie. communication infrastructure not supported.
*/
boolean deliver(String busType, String topic, Object event);
/**
* Attempts the dispatching of an "event" object over communication infrastructure "busType".
*
* @param topic topic
* @param event the event object to send
* @return true if successful, false if a failure has occurred.
* @throws IllegalArgumentException when invalid or insufficient properties are provided
* @throws IllegalStateException when the engine is in a state where this operation is not
* permitted (ie. locked or stopped).
* @throws UnsupportedOperationException when the engine cannot deliver due to the functionality
* missing (ie. communication infrastructure not supported.
*/
boolean deliver(CommInfrastructure busType, String topic, Object event);
/**
* Attempts delivering of an String over communication infrastructure "busType".
*
* @param topic topic
* @param event the event object to send
* @return true if successful, false if a failure has occurred.
* @throws IllegalArgumentException when invalid or insufficient properties are provided
* @throws IllegalStateException when the engine is in a state where this operation is not
* permitted (ie. locked or stopped).
* @throws UnsupportedOperationException when the engine cannot deliver due to the functionality
* missing (ie. communication infrastructure not supported.
*/
boolean deliver(CommInfrastructure busType, String topic, String event);
/**
* Invoked when the host goes into the active state.
*/
void activate();
/**
* Invoked when the host goes into the standby state.
*/
void deactivate();
/**
* produces a default telemetry configuration.
*
* @return policy engine configuration
*/
Properties defaultTelemetryConfig();
}
/**
* Policy Engine Manager Implementation.
*/
class PolicyEngineManager implements PolicyEngine {
/**
* String literals.
*/
private static final String INVALID_TOPIC_MSG = "Invalid Topic";
private static final String INVALID_EVENT_MSG = "Invalid Event";
private static final String ENGINE_STOPPED_MSG = "Policy Engine is stopped";
private static final String ENGINE_LOCKED_MSG = "Policy Engine is locked";
/**
* logger.
*/
private static final Logger logger = LoggerFactory.getLogger(PolicyEngineManager.class);
/**
* Is the Policy Engine running.
*/
private volatile boolean alive = false;
/**
* Is the engine locked.
*/
private volatile boolean locked = false;
/**
* Properties used to initialize the engine.
*/
private Properties properties;
/**
* Environment Properties.
*/
private final Properties environment = new Properties();
/**
* Policy Engine Sources.
*/
private List<? extends TopicSource> sources = new ArrayList<>();
/**
* Policy Engine Sinks.
*/
private List<? extends TopicSink> sinks = new ArrayList<>();
/**
* Policy Engine HTTP Servers.
*/
private List<HttpServletServer> httpServers = new ArrayList<>();
/**
* gson parser to decode configuration requests.
*/
private final Gson decoder = new GsonBuilder().disableHtmlEscaping().create();
@Override
public synchronized void boot(String[] cliArgs) {
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.beforeBoot(this, cliArgs)) {
return;
}
} catch (final Exception e) {
logger.error("{}: feature {} before-boot failure because of {}", this, feature.getClass().getName(),
e.getMessage(), e);
}
}
try {
globalInitContainer(cliArgs);
} catch (final Exception e) {
logger.error("{}: cannot init policy-container because of {}", this, e.getMessage(), e);
}
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.afterBoot(this)) {
return;
}
} catch (final Exception e) {
logger.error("{}: feature {} after-boot failure because of {}", this, feature.getClass().getName(),
e.getMessage(), e);
}
}
}
@Override
public synchronized void setEnvironment(Properties properties) {
this.environment.putAll(properties);
}
@JsonIgnore
@GsonJsonIgnore
@Override
public synchronized Properties getEnvironment() {
return this.environment;
}
@Override
public synchronized String getEnvironmentProperty(String envKey) {
String value = this.environment.getProperty(envKey);
if (value == null) {
value = System.getenv(envKey);
}
return value;
}
@Override
public synchronized String setEnvironmentProperty(String envKey, String envValue) {
return (String) this.environment.setProperty(envKey, envValue);
}
@Override
public final Properties defaultTelemetryConfig() {
final Properties defaultConfig = new Properties();
defaultConfig.put(PolicyEndPointProperties.PROPERTY_HTTP_SERVER_SERVICES, "TELEMETRY");
defaultConfig.put(PolicyEndPointProperties.PROPERTY_HTTP_SERVER_SERVICES + "." + TELEMETRY_SERVER_DEFAULT_NAME
+ PolicyEndPointProperties.PROPERTY_HTTP_HOST_SUFFIX, TELEMETRY_SERVER_DEFAULT_HOST);
defaultConfig.put(
PolicyEndPointProperties.PROPERTY_HTTP_SERVER_SERVICES + "." + TELEMETRY_SERVER_DEFAULT_NAME
+ PolicyEndPointProperties.PROPERTY_HTTP_PORT_SUFFIX,
"" + Integer.toString(TELEMETRY_SERVER_DEFAULT_PORT));
defaultConfig.put(
PolicyEndPointProperties.PROPERTY_HTTP_SERVER_SERVICES + "." + TELEMETRY_SERVER_DEFAULT_NAME
+ PolicyEndPointProperties.PROPERTY_HTTP_REST_PACKAGES_SUFFIX,
RestManager.class.getPackage().getName());
defaultConfig.put(PolicyEndPointProperties.PROPERTY_HTTP_SERVER_SERVICES + "." + TELEMETRY_SERVER_DEFAULT_NAME
+ PolicyEndPointProperties.PROPERTY_HTTP_SWAGGER_SUFFIX, "" + Boolean.TRUE);
defaultConfig.put(PolicyEndPointProperties.PROPERTY_HTTP_SERVER_SERVICES + "." + TELEMETRY_SERVER_DEFAULT_NAME
+ PolicyEndPointProperties.PROPERTY_MANAGED_SUFFIX, "" + Boolean.FALSE);
return defaultConfig;
}
@Override
public synchronized void configure(Properties properties) {
if (properties == null) {
logger.warn("No properties provided");
throw new IllegalArgumentException("No properties provided");
}
/* policy-engine dispatch pre configure hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.beforeConfigure(this, properties)) {
return;
}
} catch (final Exception e) {
logger.error("{}: feature {} before-configure failure because of {}", this,
feature.getClass().getName(), e.getMessage(), e);
}
}
this.properties = properties;
try {
this.sources = getTopicEndpointManager().addTopicSources(properties);
for (final TopicSource source : this.sources) {
source.register(this);
}
} catch (final Exception e) {
logger.error("{}: add-sources failed", this, e);
}
try {
this.sinks = getTopicEndpointManager().addTopicSinks(properties);
} catch (final IllegalArgumentException e) {
logger.error("{}: add-sinks failed", this, e);
}
try {
this.httpServers = getServletFactory().build(properties);
for (HttpServletServer server : this.httpServers) {
if (server.isAaf()) {
server.addFilterClass(null, AafTelemetryAuthFilter.class.getCanonicalName());
}
}
} catch (final IllegalArgumentException e) {
logger.error("{}: add-http-servers failed", this, e);
}
/* policy-engine dispatch post configure hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.afterConfigure(this)) {
return;
}
} catch (final Exception e) {
logger.error("{}: feature {} after-configure failure because of {}", this, feature.getClass().getName(),
e.getMessage(), e);
}
}
}
@Override
public boolean configure(PdpdConfiguration config) {
if (config == null) {
throw new IllegalArgumentException("No configuration provided");
}
final String entity = config.getEntity();
MDCTransaction mdcTrans = MDCTransaction.newTransaction(config.getRequestID(), "brmsgw");
if (this.getSources().size() == 1) {
Topic topic = this.getSources().get(0);
mdcTrans.setServiceName(topic.getTopic()).setRemoteHost(topic.getServers().toString())
.setTargetEntity(config.getEntity());
}
switch (entity) {
case PdpdConfiguration.CONFIG_ENTITY_CONTROLLER:
boolean success = controllerConfig(config);
mdcTrans.resetSubTransaction().setStatusCode(success).transaction();
return success;
default:
final String msg = "Configuration Entity is not supported: " + entity;
mdcTrans.resetSubTransaction().setStatusCode(false).setResponseDescription(msg).flush();
logger.warn(LoggerUtil.TRANSACTION_LOG_MARKER_NAME, msg);
throw new IllegalArgumentException(msg);
}
}
@Override
public synchronized PolicyController createPolicyController(String name, Properties properties) {
String tempName = name;
// check if a PROPERTY_CONTROLLER_NAME property is present
// if so, override the given name
final String propertyControllerName = properties.getProperty(DroolsProperties.PROPERTY_CONTROLLER_NAME);
if (propertyControllerName != null && !propertyControllerName.isEmpty()) {
if (!propertyControllerName.equals(tempName)) {
throw new IllegalStateException("Proposed name (" + tempName + ") and properties name ("
+ propertyControllerName + ") don't match");
}
tempName = propertyControllerName;
}
PolicyController controller;
for (final PolicyControllerFeatureAPI controllerFeature : getControllerProviders()) {
try {
controller = controllerFeature.beforeCreate(tempName, properties);
if (controller != null) {
return controller;
}
} catch (final Exception e) {
logger.error("{}: feature {} before-controller-create failure because of {}", this,
controllerFeature.getClass().getName(), e.getMessage(), e);
}
}
controller = getControllerFactory().build(tempName, properties);
if (this.isLocked()) {
controller.lock();
}
// feature hook
for (final PolicyControllerFeatureAPI controllerFeature : getControllerProviders()) {
try {
if (controllerFeature.afterCreate(controller)) {
return controller;
}
} catch (final Exception e) {
logger.error("{}: feature {} after-controller-create failure because of {}", this,
controllerFeature.getClass().getName(), e.getMessage(), e);
}
}
return controller;
}
@Override
public List<PolicyController> updatePolicyControllers(List<ControllerConfiguration> configControllers) {
final List<PolicyController> policyControllers = new ArrayList<>();
if (configControllers == null || configControllers.isEmpty()) {
logger.info("No controller configuration provided: {}", configControllers);
return policyControllers;
}
for (final ControllerConfiguration configController : configControllers) {
MDCTransaction mdcTrans = MDCTransaction.newSubTransaction(null).setTargetEntity(configController.getName())
.setTargetServiceName(configController.getOperation())
.setTargetVirtualEntity("" + configController.getDrools());
try {
final PolicyController policyController = this.updatePolicyController(configController);
policyControllers.add(policyController);
mdcTrans.setStatusCode(true).transaction();
} catch (final Exception e) {
mdcTrans.setStatusCode(false).setResponseCode(e.getClass().getName())
.setResponseDescription(e.getMessage()).flush();
logger.error(LoggerUtil.TRANSACTION_LOG_MARKER_NAME,
"{}: cannot update-policy-controllers because of {}", this, e.getMessage(), e);
}
}
return policyControllers;
}
@Override
public synchronized PolicyController updatePolicyController(ControllerConfiguration configController) {
if (configController == null) {
throw new IllegalArgumentException("No controller configuration has been provided");
}
final String controllerName = configController.getName();
if (controllerName == null || controllerName.isEmpty()) {
logger.warn("controller-name must be provided");
throw new IllegalArgumentException("No controller configuration has been provided");
}
PolicyController policyController = null;
try {
final String operation = configController.getOperation();
if (operation == null || operation.isEmpty()) {
logger.warn("operation must be provided");
throw new IllegalArgumentException("operation must be provided");
}
try {
policyController = getControllerFactory().get(controllerName);
} catch (final IllegalArgumentException e) {
// not found
logger.warn("Policy Controller " + controllerName + " not found", e);
}
if (policyController == null) {
if (operation.equalsIgnoreCase(ControllerConfiguration.CONFIG_CONTROLLER_OPERATION_LOCK)
|| operation.equalsIgnoreCase(ControllerConfiguration.CONFIG_CONTROLLER_OPERATION_UNLOCK)) {
throw new IllegalArgumentException(controllerName + " is not available for operation " + operation);
}
/* Recovery case */
logger.warn("controller {} does not exist. Attempting recovery from disk", controllerName);
final Properties controllerProperties =
getPersistenceManager().getControllerProperties(controllerName);
/*
* returned properties cannot be null (per implementation) assert (properties !=
* null)
*/
if (controllerProperties == null) {
throw new IllegalArgumentException(controllerName + " is invalid");
}
logger.warn("controller being recovered. {} Reset controller's bad maven coordinates to brainless",
controllerName);
/*
* try to bring up bad controller in brainless mode, after having it working, apply
* the new create/update operation.
*/
controllerProperties.setProperty(DroolsProperties.RULES_GROUPID, DroolsController.NO_GROUP_ID);
controllerProperties.setProperty(DroolsProperties.RULES_ARTIFACTID, DroolsController.NO_ARTIFACT_ID);
controllerProperties.setProperty(DroolsProperties.RULES_VERSION, DroolsController.NO_VERSION);
policyController = getPolicyEngine().createPolicyController(controllerName, controllerProperties);
/* fall through to do brain update operation */
}
switch (operation) {
case ControllerConfiguration.CONFIG_CONTROLLER_OPERATION_CREATE:
getControllerFactory().patch(policyController, configController.getDrools());
break;
case ControllerConfiguration.CONFIG_CONTROLLER_OPERATION_UPDATE:
policyController.unlock();
getControllerFactory().patch(policyController, configController.getDrools());
break;
case ControllerConfiguration.CONFIG_CONTROLLER_OPERATION_LOCK:
policyController.lock();
break;
case ControllerConfiguration.CONFIG_CONTROLLER_OPERATION_UNLOCK:
policyController.unlock();
break;
default:
final String msg = "Controller Operation Configuration is not supported: " + operation + " for "
+ controllerName;
logger.warn(msg);
throw new IllegalArgumentException(msg);
}
return policyController;
} catch (final Exception e) {
logger.error("{}: cannot update-policy-controller because of {}", this, e.getMessage(), e);
throw e;
} catch (final LinkageError e) {
logger.error("{}: cannot update-policy-controllers (rules) because of {}", this, e.getMessage(), e);
throw new IllegalStateException(e);
}
}
@Override
public synchronized boolean start() {
/* policy-engine dispatch pre start hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.beforeStart(this)) {
return true;
}
} catch (final Exception e) {
logger.error("{}: feature {} before-start failure because of {}", this, feature.getClass().getName(),
e.getMessage(), e);
}
}
boolean success = true;
if (this.locked) {
throw new IllegalStateException(ENGINE_LOCKED_MSG);
}
this.alive = true;
/* Start Policy Engine exclusively-owned (unmanaged) http servers */
for (final HttpServletServer httpServer : this.httpServers) {
try {
if (!httpServer.waitedStart(10 * 1000L)) {
success = false;
}
} catch (final Exception e) {
logger.error("{}: cannot start http-server {} because of {}", this, httpServer, e.getMessage(), e);
}
}
/* Start Policy Engine exclusively-owned (unmanaged) sources */
for (final TopicSource source : this.sources) {
try {
if (!source.start()) {
success = false;
}
} catch (final Exception e) {
logger.error("{}: cannot start topic-source {} because of {}", this, source, e.getMessage(), e);
}
}
/* Start Policy Engine owned (unmanaged) sinks */
for (final TopicSink sink : this.sinks) {
try {
if (!sink.start()) {
success = false;
}
} catch (final Exception e) {
logger.error("{}: cannot start topic-sink {} because of {}", this, sink, e.getMessage(), e);
}
}
/* Start Policy Controllers */
final List<PolicyController> controllers = getControllerFactory().inventory();
for (final PolicyController controller : controllers) {
try {
if (!controller.start()) {
success = false;
}
} catch (final Exception e) {
logger.error("{}: cannot start policy-controller {} because of {}", this, controller, e.getMessage(),
e);
success = false;
}
}
/* Start managed Topic Endpoints */
try {
if (!getTopicEndpointManager().start()) {
success = false;
}
} catch (final IllegalStateException e) {
logger.warn("{}: Topic Endpoint Manager is in an invalid state because of {}", this, e.getMessage(), e);
}
// Start the JMX listener
startPdpJmxListener();
/* policy-engine dispatch after start hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.afterStart(this)) {
return success;
}
} catch (final Exception e) {
logger.error("{}: feature {} after-start failure because of {}", this, feature.getClass().getName(),
e.getMessage(), e);
}
}
return success;
}
@Override
public synchronized boolean stop() {
/* policy-engine dispatch pre stop hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.beforeStop(this)) {
return true;
}
} catch (final Exception e) {
logger.error("{}: feature {} before-stop failure because of {}", this, feature.getClass().getName(),
e.getMessage(), e);
}
}
/* stop regardless of the lock state */
boolean success = true;
if (!this.alive) {
return true;
}
this.alive = false;
final List<PolicyController> controllers = getControllerFactory().inventory();
for (final PolicyController controller : controllers) {
try {
if (!controller.stop()) {
success = false;
}
} catch (final Exception e) {
logger.error("{}: cannot stop policy-controller {} because of {}", this, controller, e.getMessage(), e);
success = false;
}
}
/* Stop Policy Engine owned (unmanaged) sources */
for (final TopicSource source : this.sources) {
try {
if (!source.stop()) {
success = false;
}
} catch (final Exception e) {
logger.error("{}: cannot start topic-source {} because of {}", this, source, e.getMessage(), e);
}
}
/* Stop Policy Engine owned (unmanaged) sinks */
for (final TopicSink sink : this.sinks) {
try {
if (!sink.stop()) {
success = false;
}
} catch (final Exception e) {
logger.error("{}: cannot start topic-sink {} because of {}", this, sink, e.getMessage(), e);
}
}
/* stop all managed topics sources and sinks */
if (!getTopicEndpointManager().stop()) {
success = false;
}
/* stop all unmanaged http servers */
for (final HttpServletServer httpServer : this.httpServers) {
try {
if (!httpServer.stop()) {
success = false;
}
} catch (final Exception e) {
logger.error("{}: cannot start http-server {} because of {}", this, httpServer, e.getMessage(), e);
}
}
// stop JMX?
/* policy-engine dispatch pre stop hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.afterStop(this)) {
return success;
}
} catch (final Exception e) {
logger.error("{}: feature {} after-stop failure because of {}", this, feature.getClass().getName(),
e.getMessage(), e);
}
}
return success;
}
@Override
public synchronized void shutdown() {
/*
* shutdown activity even when underlying subcomponents (features, controllers, topics, etc
* ..) are stuck
*/
Thread exitThread = makeShutdownThread();
exitThread.start();
/* policy-engine dispatch pre shutdown hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.beforeShutdown(this)) {
return;
}
} catch (final Exception e) {
logger.error("{}: feature {} before-shutdown failure because of {}", this, feature.getClass().getName(),
e.getMessage(), e);
}
}
this.alive = false;
/* Shutdown Policy Engine owned (unmanaged) sources */
for (final TopicSource source : this.sources) {
try {
source.shutdown();
} catch (final Exception e) {
logger.error("{}: cannot shutdown topic-source {} because of {}", this, source, e.getMessage(), e);
}
}
/* Shutdown Policy Engine owned (unmanaged) sinks */
for (final TopicSink sink : this.sinks) {
try {
sink.shutdown();
} catch (final Exception e) {
logger.error("{}: cannot shutdown topic-sink {} because of {}", this, sink, e.getMessage(), e);
}
}
/* Shutdown managed resources */
getControllerFactory().shutdown();
getTopicEndpointManager().shutdown();
getServletFactory().destroy();
// Stop the JMX listener
stopPdpJmxListener();
/* policy-engine dispatch post shutdown hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.afterShutdown(this)) {
return;
}
} catch (final Exception e) {
logger.error("{}: feature {} after-shutdown failure because of {}", this, feature.getClass().getName(),
e.getMessage(), e);
}
}
exitThread.interrupt();
logger.info("{}: normal termination", this);
}
/**
* Thread that shuts down http servers.
*/
protected class ShutdownThread extends Thread {
private static final long SHUTDOWN_MAX_GRACE_TIME = 30000L;
@Override
public void run() {
try {
doSleep(SHUTDOWN_MAX_GRACE_TIME);
logger.warn("{}: abnormal termination - shutdown graceful time period expiration",
PolicyEngineManager.this);
} catch (final InterruptedException e) {
/* courtesy to shutdown() to allow it to return */
synchronized (PolicyEngineManager.this) {
}
logger.info("{}: finishing a graceful shutdown ", PolicyEngineManager.this, e);
} finally {
/*
* shut down the Policy Engine owned http servers as the very last thing
*/
for (final HttpServletServer httpServer : PolicyEngineManager.this.getHttpServers()) {
try {
httpServer.shutdown();
} catch (final Exception e) {
logger.error("{}: cannot shutdown http-server {} because of {}", PolicyEngineManager.this,
httpServer, e.getMessage(), e);
}
}
logger.info("{}: exit", PolicyEngineManager.this);
doExit(0);
}
}
// these may be overridden by junit tests
protected void doSleep(long sleepMs) throws InterruptedException {
Thread.sleep(sleepMs);
}
protected void doExit(int code) {
System.exit(code);
}
}
@Override
public boolean isAlive() {
return this.alive;
}
@Override
public synchronized boolean lock() {
/* policy-engine dispatch pre lock hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.beforeLock(this)) {
return true;
}
} catch (final Exception e) {
logger.error("{}: feature {} before-lock failure because of {}", this, feature.getClass().getName(),
e.getMessage(), e);
}
}
if (this.locked) {
return true;
}
this.locked = true;
boolean success = true;
final List<PolicyController> controllers = getControllerFactory().inventory();
for (final PolicyController controller : controllers) {
try {
success = controller.lock() && success;
} catch (final Exception e) {
logger.error("{}: cannot lock policy-controller {} because of {}", this, controller, e.getMessage(), e);
success = false;
}
}
success = getTopicEndpointManager().lock() && success;
/* policy-engine dispatch post lock hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.afterLock(this)) {
return success;
}
} catch (final Exception e) {
logger.error("{}: feature {} after-lock failure because of {}", this, feature.getClass().getName(),
e.getMessage(), e);
}
}
return success;
}
@Override
public synchronized boolean unlock() {
/* policy-engine dispatch pre unlock hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.beforeUnlock(this)) {
return true;
}
} catch (final Exception e) {
logger.error("{}: feature {} before-unlock failure because of {}", this, feature.getClass().getName(),
e.getMessage(), e);
}
}
if (!this.locked) {
return true;
}
this.locked = false;
boolean success = true;
final List<PolicyController> controllers = getControllerFactory().inventory();
for (final PolicyController controller : controllers) {
try {
success = controller.unlock() && success;
} catch (final Exception e) {
logger.error("{}: cannot unlock policy-controller {} because of {}", this, controller, e.getMessage(),
e);
success = false;
}
}
success = getTopicEndpointManager().unlock() && success;
/* policy-engine dispatch after unlock hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.afterUnlock(this)) {
return success;
}
} catch (final Exception e) {
logger.error("{}: feature {} after-unlock failure because of {}", this, feature.getClass().getName(),
e.getMessage(), e);
}
}
return success;
}
@Override
public boolean isLocked() {
return this.locked;
}
@Override
public void removePolicyController(String name) {
getControllerFactory().destroy(name);
}
@Override
public void removePolicyController(PolicyController controller) {
getControllerFactory().destroy(controller);
}
@JsonIgnore
@GsonJsonIgnore
@Override
public List<PolicyController> getPolicyControllers() {
return getControllerFactory().inventory();
}
@JsonProperty("controllers")
@GsonJsonProperty("controllers")
@Override
public List<String> getPolicyControllerIds() {
final List<String> controllerNames = new ArrayList<>();
for (final PolicyController controller : getControllerFactory().inventory()) {
controllerNames.add(controller.getName());
}
return controllerNames;
}
@Override
@JsonIgnore
@GsonJsonIgnore
public Properties getProperties() {
return this.properties;
}
@SuppressWarnings("unchecked")
@Override
public List<TopicSource> getSources() {
return (List<TopicSource>) this.sources;
}
@SuppressWarnings("unchecked")
@Override
public List<TopicSink> getSinks() {
return (List<TopicSink>) this.sinks;
}
@Override
public List<HttpServletServer> getHttpServers() {
return this.httpServers;
}
@Override
public List<String> getFeatures() {
final List<String> features = new ArrayList<>();
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
features.add(feature.getName());
}
return features;
}
@JsonIgnore
@GsonJsonIgnore
@Override
public List<PolicyEngineFeatureAPI> getFeatureProviders() {
return getEngineProviders();
}
@Override
public PolicyEngineFeatureAPI getFeatureProvider(String featureName) {
if (featureName == null || featureName.isEmpty()) {
throw new IllegalArgumentException("A feature name must be provided");
}
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
if (feature.getName().equals(featureName)) {
return feature;
}
}
throw new IllegalArgumentException("Invalid Feature Name: " + featureName);
}
@Override
public void onTopicEvent(CommInfrastructure commType, String topic, String event) {
/* policy-engine pre topic event hook */
for (final PolicyEngineFeatureAPI feature : getFeatureProviders()) {
try {
if (feature.beforeOnTopicEvent(this, commType, topic, event)) {
return;
}
} catch (final Exception e) {
logger.error("{}: feature {} beforeOnTopicEvent failure on event {} because of {}", this,
feature.getClass().getName(), event, e.getMessage(), e);
}
}
/* configuration request */
PdpdConfiguration configuration = null;
try {
configuration = this.decoder.fromJson(event, PdpdConfiguration.class);
this.configure(configuration);
} catch (final Exception e) {
logger.error("{}: configuration-error due to {} because of {}", this, event, e.getMessage(), e);
}
/* policy-engine after topic event hook */
for (final PolicyEngineFeatureAPI feature : getFeatureProviders()) {
try {
if (feature.afterOnTopicEvent(this, configuration, commType, topic, event)) {
return;
}
} catch (final Exception e) {
logger.error("{}: feature {} afterOnTopicEvent failure on event {} because of {}", this,
feature.getClass().getName(), event, e.getMessage(), e);
}
}
}
@Override
public boolean deliver(String topic, Object event) {
/*
* Note this entry point is usually from the DRL
*/
if (topic == null || topic.isEmpty()) {
throw new IllegalArgumentException(INVALID_TOPIC_MSG);
}
if (event == null) {
throw new IllegalArgumentException(INVALID_EVENT_MSG);
}
if (!this.isAlive()) {
throw new IllegalStateException(ENGINE_STOPPED_MSG);
}
if (this.isLocked()) {
throw new IllegalStateException(ENGINE_LOCKED_MSG);
}
final List<? extends TopicSink> topicSinks = getTopicEndpointManager().getTopicSinks(topic);
if (topicSinks == null || topicSinks.size() != 1) {
throw new IllegalStateException("Cannot ensure correct delivery on topic " + topic + ": " + topicSinks);
}
return this.deliver(topicSinks.get(0).getTopicCommInfrastructure(), topic, event);
}
@Override
public boolean deliver(String busType, String topic, Object event) {
/*
* Note this entry point is usually from the DRL (one of the reasons busType is String.
*/
if (busType == null || busType.isEmpty()) {
throw new IllegalArgumentException("Invalid Communication Infrastructure");
}
if (topic == null || topic.isEmpty()) {
throw new IllegalArgumentException(INVALID_TOPIC_MSG);
}
if (event == null) {
throw new IllegalArgumentException(INVALID_EVENT_MSG);
}
boolean valid = false;
for (final Topic.CommInfrastructure comm : Topic.CommInfrastructure.values()) {
if (comm.name().equals(busType)) {
valid = true;
}
}
if (!valid) {
throw new IllegalArgumentException("Invalid Communication Infrastructure: " + busType);
}
if (!this.isAlive()) {
throw new IllegalStateException(ENGINE_STOPPED_MSG);
}
if (this.isLocked()) {
throw new IllegalStateException(ENGINE_LOCKED_MSG);
}
return this.deliver(Topic.CommInfrastructure.valueOf(busType), topic, event);
}
@Override
public boolean deliver(Topic.CommInfrastructure busType, String topic, Object event) {
if (topic == null || topic.isEmpty()) {
throw new IllegalArgumentException(INVALID_TOPIC_MSG);
}
if (event == null) {
throw new IllegalArgumentException(INVALID_EVENT_MSG);
}
if (!this.isAlive()) {
throw new IllegalStateException(ENGINE_STOPPED_MSG);
}
if (this.isLocked()) {
throw new IllegalStateException(ENGINE_LOCKED_MSG);
}
/*
* Try to send through the controller, this is the preferred way, since it may want to apply
* additional processing
*/
try {
final DroolsController droolsController = getProtocolCoder().getDroolsController(topic, event);
final PolicyController controller = getControllerFactory().get(droolsController);
if (controller != null) {
return controller.deliver(busType, topic, event);
}
} catch (final Exception e) {
logger.warn("{}: cannot find policy-controller to deliver {} over {}:{} because of {}", this, event,
busType, topic, e.getMessage(), e);
/* continue (try without routing through the controller) */
}
/*
* cannot route through the controller, send directly through the topic sink
*/
try {
final String json = getProtocolCoder().encode(topic, event);
return this.deliver(busType, topic, json);
} catch (final Exception e) {
logger.warn("{}: cannot deliver {} over {}:{} because of {}", this, event, busType, topic, e.getMessage(),
e);
throw e;
}
}
@Override
public boolean deliver(Topic.CommInfrastructure busType, String topic, String event) {
if (topic == null || topic.isEmpty()) {
throw new IllegalArgumentException(INVALID_TOPIC_MSG);
}
if (event == null || event.isEmpty()) {
throw new IllegalArgumentException(INVALID_EVENT_MSG);
}
if (!this.isAlive()) {
throw new IllegalStateException(ENGINE_STOPPED_MSG);
}
if (this.isLocked()) {
throw new IllegalStateException(ENGINE_LOCKED_MSG);
}
try {
final TopicSink sink = getTopicEndpointManager().getTopicSink(busType, topic);
if (sink == null) {
throw new IllegalStateException("Inconsistent State: " + this);
}
return sink.send(event);
} catch (final Exception e) {
logger.warn("{}: cannot deliver {} over {}:{} because of {}", this, event, busType, topic, e.getMessage(),
e);
throw e;
}
}
@Override
public synchronized void activate() {
/* policy-engine dispatch pre activate hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.beforeActivate(this)) {
return;
}
} catch (final Exception e) {
logger.error("{}: feature {} before-activate failure because of {}", this, feature.getClass().getName(),
e.getMessage(), e);
}
}
// activate 'policy-management'
for (final PolicyController policyController : this.getPolicyControllers()) {
try {
policyController.unlock();
policyController.start();
} catch (final Exception e) {
logger.error("{}: cannot activate of policy-controller {} because of {}", this, policyController,
e.getMessage(), e);
} catch (final LinkageError e) {
logger.error("{}: cannot activate (rules compilation) of policy-controller {} because of {}", this,
policyController, e.getMessage(), e);
}
}
this.unlock();
/* policy-engine dispatch post activate hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.afterActivate(this)) {
return;
}
} catch (final Exception e) {
logger.error("{}: feature {} after-activate failure because of {}", this, feature.getClass().getName(),
e.getMessage(), e);
}
}
}
@Override
public synchronized void deactivate() {
/* policy-engine dispatch pre deactivate hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.beforeDeactivate(this)) {
return;
}
} catch (final Exception e) {
logger.error("{}: feature {} before-deactivate failure because of {}", this,
feature.getClass().getName(), e.getMessage(), e);
}
}
this.lock();
for (final PolicyController policyController : this.getPolicyControllers()) {
try {
policyController.stop();
} catch (final Exception | LinkageError e) {
logger.error("{}: cannot deactivate (stop) policy-controller {} because of {}", this, policyController,
e.getMessage(), e);
}
}
/* policy-engine dispatch post deactivate hook */
for (final PolicyEngineFeatureAPI feature : getEngineProviders()) {
try {
if (feature.afterDeactivate(this)) {
return;
}
} catch (final Exception e) {
logger.error("{}: feature {} after-deactivate failure because of {}", this,
feature.getClass().getName(), e.getMessage(), e);
}
}
}
private boolean controllerConfig(PdpdConfiguration config) {
/* only this one supported for now */
final List<ControllerConfiguration> configControllers = config.getControllers();
if (configControllers == null || configControllers.isEmpty()) {
logger.info("No controller configuration provided: {}", config);
return false;
}
final List<PolicyController> policyControllers = this.updatePolicyControllers(config.getControllers());
boolean success = false;
if (!(policyControllers == null || policyControllers.isEmpty())
&& (policyControllers.size() == configControllers.size())) {
success = true;
}
return success;
}
@Override
public String toString() {
return "PolicyEngineManager [alive=" + this.alive + ", locked=" + this.locked + "]";
}
// these methods may be overridden by junit tests
protected List<PolicyEngineFeatureAPI> getEngineProviders() {
return PolicyEngineFeatureAPI.providers.getList();
}
protected List<PolicyControllerFeatureAPI> getControllerProviders() {
return PolicyControllerFeatureAPI.providers.getList();
}
protected void globalInitContainer(String[] cliArgs) {
PolicyContainer.globalInit(cliArgs);
}
protected TopicEndpoint getTopicEndpointManager() {
return TopicEndpoint.manager;
}
protected HttpServletServerFactory getServletFactory() {
return HttpServletServer.factory;
}
protected PolicyControllerFactory getControllerFactory() {
return PolicyController.factory;
}
protected void startPdpJmxListener() {
PdpJmxListener.start();
}
protected void stopPdpJmxListener() {
PdpJmxListener.stop();
}
protected Thread makeShutdownThread() {
return new ShutdownThread();
}
protected EventProtocolCoder getProtocolCoder() {
return EventProtocolCoder.manager;
}
protected SystemPersistence getPersistenceManager() {
return SystemPersistence.manager;
}
protected PolicyEngine getPolicyEngine() {
return PolicyEngine.manager;
}
}
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