package com.thinkbiganalytics.nifi.v2.core.precondition;
/*-
* #%L
* thinkbig-nifi-core-service
* %%
* Copyright (C) 2017 ThinkBig Analytics
* %%
* 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.
* #L%
*/
import com.thinkbiganalytics.nifi.core.api.precondition.FeedPreconditionEventService;
import com.thinkbiganalytics.nifi.core.api.precondition.PreconditionEventConsumer;
import com.thinkbiganalytics.nifi.core.api.precondition.PreconditionListener;
import com.thinkbiganalytics.nifi.core.api.spring.SpringContextService;
import org.apache.nifi.annotation.lifecycle.OnEnabled;
import org.apache.nifi.components.PropertyDescriptor;
import org.apache.nifi.controller.AbstractControllerService;
import org.apache.nifi.controller.ConfigurationContext;
import org.apache.nifi.reporting.InitializationException;
import java.util.Collections;
import java.util.List;
/**
* used to communicate precondition events via JMS
*/
public class JmsFeedPreconditionEventService extends AbstractControllerService implements FeedPreconditionEventService {
/**
* Property provides the service for loading spring a spring context and providing bean lookup
*/
public static final PropertyDescriptor SPRING_SERVICE = new PropertyDescriptor.Builder()
.name("Spring Context Service")
.description("Service for loading spring a spring context and providing bean lookup")
.required(true)
.identifiesControllerService(SpringContextService.class)
.build();
private SpringContextService springService;
@Override
protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
return Collections.singletonList(SPRING_SERVICE);
}
/**
* responds to the onConfigured event to wire in the spring context service as a controller service
*
* @param context the configuration context of the processor
* @throws InitializationException if there are any errors getting the spring controller service
*/
@OnEnabled
public void onConfigured(final ConfigurationContext context) throws InitializationException {
this.springService = context.getProperty(SPRING_SERVICE).asControllerService(SpringContextService.class);
}
/* (non-Javadoc)
* @see com.thinkbiganalytics.controller.precond.FeedPreconditionEventService#addListener(java.lang.String, com.thinkbiganalytics.controller.precond.PreconditionListener)
*/
@Override
public void addListener(String category, String feedName, PreconditionListener listener) {
PreconditionEventConsumer consumer = this.springService.getBean(PreconditionEventConsumer.class);
getLogger().debug("Adding preconditon listener: {}.{} - {} to consumer {}", new Object[]{category, feedName, listener, consumer});
consumer.addListener(category, feedName, listener);
}
/* (non-Javadoc)
* @see com.thinkbiganalytics.controller.precond.FeedPreconditionEventService#removeListener(com.thinkbiganalytics.controller.precond.PreconditionListener)
*/
@Override
public void removeListener(PreconditionListener listener) {
PreconditionEventConsumer consumer = this.springService.getBean(PreconditionEventConsumer.class);
getLogger().debug("Removing preconditon listener: {} from consumer {}", new Object[]{listener, consumer});
consumer.removeListener(listener);
}
}