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authorramverma <ram.krishna.verma@est.tech>2019-03-06 15:43:11 +0000
committerramverma <ram.krishna.verma@est.tech>2019-03-06 15:43:11 +0000
commitf32032b7b46c6857accab37be66b52ad60fcd690 (patch)
treebe55b7a40b9a3b6bffc9fcab5dd04b58e67a5cc4 /policy-endpoints/src/main/java
parent23a3dc4ece2f1533fe1d6b627b5db05e7754a70c (diff)
Adding client class for sending message to topic
1) Adding TopicSinkClient class for sending messages to topic. The same class will be used for PAP->PDP & PDP->PAP communication. 2) Once this review is through, will raise another one to remove PdpClient from policy/pap. Change-Id: I7253683d9e88885cfbe2ac9041d01da239b9321b Issue-ID: POLICY-1443 Signed-off-by: ramverma <ram.krishna.verma@est.tech>
Diffstat (limited to 'policy-endpoints/src/main/java')
-rw-r--r--policy-endpoints/src/main/java/org/onap/policy/common/endpoints/event/comm/client/TopicSinkClient.java104
-rw-r--r--policy-endpoints/src/main/java/org/onap/policy/common/endpoints/event/comm/client/TopicSinkClientException.java51
2 files changed, 155 insertions, 0 deletions
diff --git a/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/event/comm/client/TopicSinkClient.java b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/event/comm/client/TopicSinkClient.java
new file mode 100644
index 00000000..3188b8d4
--- /dev/null
+++ b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/event/comm/client/TopicSinkClient.java
@@ -0,0 +1,104 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP PAP
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * Modifications Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.event.comm.client;
+
+
+import java.util.List;
+
+import lombok.Getter;
+
+import org.onap.policy.common.endpoints.event.comm.TopicEndpoint;
+import org.onap.policy.common.endpoints.event.comm.TopicSink;
+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.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Client for sending messages to a Topic using TopicSink.
+ */
+public class TopicSinkClient {
+ private static final Logger logger = LoggerFactory.getLogger(TopicSinkClient.class);
+
+ /**
+ * Coder used to encode messages being sent to the topic.
+ */
+ private static final Coder CODER = new StandardCoder();
+
+ /**
+ * Topic to which messages are published.
+ */
+ @Getter
+ private final String topic;
+
+ /**
+ * Where messages are published.
+ */
+ private final TopicSink sink;
+
+ /**
+ * Constructs the object.
+ *
+ * @param topic topic to which messages should be published
+ * @throws TopicSinkClientException if the topic does not exist
+ */
+ public TopicSinkClient(final String topic) throws TopicSinkClientException {
+ this.topic = topic;
+
+ final List<TopicSink> lst = getTopicSinks(topic);
+ if (lst.isEmpty()) {
+ throw new TopicSinkClientException("no sinks for topic: " + topic);
+ }
+
+ this.sink = lst.get(0);
+ }
+
+ /**
+ * Sends a message to the topic, after encoding the message as json.
+ *
+ * @param message message to be encoded and sent
+ * @return {@code true} if the message was successfully sent/enqueued, {@code false} otherwise
+ */
+ public boolean send(final Object message) {
+ try {
+ final String json = CODER.encode(message);
+ return sink.send(json);
+
+ } catch (RuntimeException | CoderException e) {
+ logger.warn("send to {} failed because of {}", topic, e.getMessage(), e);
+ return false;
+ }
+ }
+
+ // the remaining methods are wrappers that can be overridden by junit tests
+
+ /**
+ * Gets the sinks for a given topic.
+ *
+ * @param topic the topic of interest
+ * @return the sinks for the topic
+ */
+ protected List<TopicSink> getTopicSinks(final String topic) {
+ return TopicEndpoint.manager.getTopicSinks(topic);
+ }
+}
diff --git a/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/event/comm/client/TopicSinkClientException.java b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/event/comm/client/TopicSinkClientException.java
new file mode 100644
index 00000000..608393b3
--- /dev/null
+++ b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/event/comm/client/TopicSinkClientException.java
@@ -0,0 +1,51 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP PAP
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * Modifications Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.event.comm.client;
+
+/**
+ * Exception thrown by TopicSink client classes.
+ */
+public class TopicSinkClientException extends Exception {
+ private static final long serialVersionUID = 1L;
+
+ public TopicSinkClientException() {
+ super();
+ }
+
+ public TopicSinkClientException(final String message) {
+ super(message);
+ }
+
+ public TopicSinkClientException(final Throwable cause) {
+ super(cause);
+ }
+
+ public TopicSinkClientException(final String message, final Throwable cause) {
+ super(message, cause);
+ }
+
+ public TopicSinkClientException(final String message, final Throwable cause, final boolean enableSuppression,
+ final boolean writableStackTrace) {
+ super(message, cause, enableSuppression, writableStackTrace);
+ }
+
+}