diff options
Diffstat (limited to 'policy-endpoints/src/main/java/org/onap/policy/common/endpoints/listeners/JsonListener.java')
-rw-r--r-- | policy-endpoints/src/main/java/org/onap/policy/common/endpoints/listeners/JsonListener.java | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/listeners/JsonListener.java b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/listeners/JsonListener.java new file mode 100644 index 00000000..ff8cbc5b --- /dev/null +++ b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/listeners/JsonListener.java @@ -0,0 +1,74 @@ +/* + * ============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.endpoints.event.comm.TopicListener; +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 messages received on a topic, in JSON format, decodes them into a + * {@link StandardCoderObject}, and then offers the objects to the subclass. + */ +public abstract class JsonListener implements TopicListener { + private static final Logger logger = LoggerFactory.getLogger(JsonListener.class); + + /** + * Used to decode the event. + */ + private static final Coder coder = new StandardCoder(); + + /** + * Constructs the object. + */ + public JsonListener() { + super(); + } + + @Override + public void onTopicEvent(CommInfrastructure infra, String topic, String event) { + // decode from JSON into a standard object + StandardCoderObject sco; + try { + sco = coder.decode(event, StandardCoderObject.class); + + } catch (CoderException e) { + logger.warn("unable to decode: {}", event, e); + return; + } + + onTopicEvent(infra, topic, sco); + } + + /** + * Indicates that a standard object was received. + * + * @param infra infrastructure with which the message was received + * @param topic topic on which the message was received + * @param sco the standard object that was received + */ + public abstract void onTopicEvent(CommInfrastructure infra, String topic, StandardCoderObject sco); +} |