1 files changed, 96 insertions, 0 deletions
diff --git a/src/main/java/org/onap/dcae/commonFunction/DmaapPublishers.java b/src/main/java/org/onap/dcae/commonFunction/DmaapPublishers.java
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index 00000000..c86a3742
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+++ b/src/main/java/org/onap/dcae/commonFunction/DmaapPublishers.java
@@ -0,0 +1,96 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.ves
+ * ================================================================================
+ * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
+ * Copyright (C) 2018 Nokia. 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.dcae.commonFunction;
+
+import com.att.nsa.cambria.client.CambriaBatchingPublisher;
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+import com.google.common.cache.RemovalListener;
+import com.google.common.cache.RemovalNotification;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.security.GeneralSecurityException;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+class DmaapPublishers {
+
+    private static Logger log = LoggerFactory.getLogger(DmaapPublishers.class);
+    private final LoadingCache<String, CambriaBatchingPublisher> publishers;
+
+    private DmaapPublishers(
+            LoadingCache<String, CambriaBatchingPublisher> publishers) {
+        this.publishers = publishers;
+    }
+
+    static DmaapPublishers create() {
+        return create(new CambriaPublisherFactory());
+    }
+
+    static DmaapPublishers create(final CambriaPublisherFactory publisherFactory) {
+        final LoadingCache<String, CambriaBatchingPublisher> cache = CacheBuilder.<String, CambriaBatchingPublisher>newBuilder()
+//            .expireAfterAccess(10, TimeUnit.MINUTES)
+                .removalListener(new RemovalListener<String, CambriaBatchingPublisher>() {
+                    @Override
+                    public void onRemoval(RemovalNotification<String, CambriaBatchingPublisher> notification) {
+                        if (notification.getValue() != null) {
+                            onCacheItemInvalidated(notification.getValue());
+                        }
+                    }
+                })
+                .build(new CacheLoader<String, CambriaBatchingPublisher>() {
+                    @Override
+                    public CambriaBatchingPublisher load(String streamId)
+                            throws MalformedURLException, GeneralSecurityException {
+                        try {
+                            return publisherFactory.createCambriaPublisher(streamId);
+                        } catch (MalformedURLException | GeneralSecurityException e) {
+                            log.error("CambriaClientBuilders connection reader exception : streamID - " + streamId + " "
+                                    + e.getMessage());
+                            throw e;
+                        }
+                    }
+                });
+        return new DmaapPublishers(cache);
+    }
+
+    public CambriaBatchingPublisher getByStreamId(String streamId) {
+        return publishers.getUnchecked(streamId);
+    }
+
+    public void closeByStreamId(String streamId) {
+        publishers.invalidate(streamId);
+    }
+
+    private static void onCacheItemInvalidated(CambriaBatchingPublisher pub) {
+        try {
+            final List<?> stuck = pub.close(20, TimeUnit.SECONDS);
+            if (!stuck.isEmpty()) {
+                log.error(stuck.size() + " messages unsent");
+            }
+        } catch (InterruptedException | IOException e) {
+            log.error("Caught Exception on Close event: {}", e);
+        }
+    }
+}