diff options
Diffstat (limited to 'policy-endpoints/src/main/java/org/onap/policy/common/endpoints/listeners/ScoListener.java')
-rw-r--r-- | policy-endpoints/src/main/java/org/onap/policy/common/endpoints/listeners/ScoListener.java | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/listeners/ScoListener.java b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/listeners/ScoListener.java new file mode 100644 index 00000000..a3d33965 --- /dev/null +++ b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/listeners/ScoListener.java @@ -0,0 +1,91 @@ +/* + * ============LICENSE_START======================================================= + * ONAP + * ================================================================================ + * Copyright (C) 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.common.endpoints.listeners; + +import org.onap.policy.common.endpoints.event.comm.Topic.CommInfrastructure; +import org.onap.policy.common.utils.coder.Coder; +import org.onap.policy.common.utils.coder.CoderException; +import org.onap.policy.common.utils.coder.StandardCoder; +import org.onap.policy.common.utils.coder.StandardCoderObject; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Listens for receipt of a {@link StandardCoderObject}, translating it into an object of + * the appropriate type, and then passing it to the subclass. + * + * @param <T> type of message/POJO this handles + */ +public abstract class ScoListener<T> { + + private static final Logger logger = LoggerFactory.getLogger(ScoListener.class); + + /** + * Used to translate the standard object to an object of type "T". + */ + private static final Coder coder = new StandardCoder(); + + /** + * Class of message this handles. + */ + private final Class<T> clazz; + + /** + * Constructs the object. + * + * @param clazz class of message this handles + */ + public ScoListener(Class<T> clazz) { + this.clazz = clazz; + } + + /** + * Receives an event, translates it into the desired type of object, and passes it to + * the subclass. + * + * @param infra infrastructure with which the message was received + * @param topic topic on which the message was received + * @param sco event that was received + */ + public void onTopicEvent(CommInfrastructure infra, String topic, StandardCoderObject sco) { + // translate the event to the desired object type + final T msg; + try { + msg = coder.fromStandard(sco, clazz); + + } catch (CoderException e) { + logger.warn("unable to decode {}: {}", clazz.getName(), sco, e); + return; + } + + onTopicEvent(infra, topic, sco, msg); + } + + /** + * Indicates that a message was received. + * + * @param infra infrastructure with which the message was received + * @param topic topic on which the message was received + * @param sco event that was received + * @param message message that was received + */ + public abstract void onTopicEvent(CommInfrastructure infra, String topic, StandardCoderObject sco, T message); +} |