Initial TCA commit into DCAEGEN2

[dcaegen2/analytics/tca.git] / dcae-analytics-common / src / main / java / org / openecomp / dcae / apod / analytics / common / service / processor / GenericMessageChainProcessor.java

diff --git a/dcae-analytics-common/src/main/java/org/openecomp/dcae/apod/analytics/common/service/processor/GenericMessageChainProcessor.java b/dcae-analytics-common/src/main/java/org/openecomp/dcae/apod/analytics/common/service/processor/GenericMessageChainProcessor.java
new file mode 100644 (file)
index 0000000..982641d
--- /dev/null
+++ b/dcae-analytics-common/src/main/java/org/openecomp/dcae/apod/analytics/common/service/processor/GenericMessageChainProcessor.java
@@ -0,0 +1,70 @@
+/*
+ * ===============================LICENSE_START======================================
+ *  dcae-analytics
+ * ================================================================================
+ *    Copyright © 2017 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.openecomp.dcae.apod.analytics.common.service.processor;
+
+import org.openecomp.dcae.apod.analytics.common.utils.MessageProcessorUtils.MessageProcessorFunction;
+
+import java.util.List;
+
+import static org.openecomp.dcae.apod.analytics.common.utils.MessageProcessorUtils.computeMessageProcessorChain;
+
+/**
+ * <p>
+ *     A Generic Message Processor which passes the {@link ProcessorContext} from first to second
+ *     {@link MessageProcessor}
+ * </p>
+ *
+ * @param <P> Processor Context sub classes
+ *
+ * @author Rajiv Singla . Creation Date: 11/8/2016.
+ */
+public class GenericMessageChainProcessor<P extends ProcessorContext> {
+
+    private final List<? extends MessageProcessor<P>> messageProcessors;
+    private final P initialProcessorContext;
+
+    public GenericMessageChainProcessor(List<? extends MessageProcessor<P>> messageProcessors,
+                                        P initialProcessorContext) {
+        this.messageProcessors = messageProcessors;
+        this.initialProcessorContext = initialProcessorContext;
+    }
+
+    /**
+     * Process a processor chain
+     *
+     * @return Processor Context after processing the processor chain
+     */
+    public P processChain() {
+
+        final MessageProcessorFunction<P> messageProcessorFunction =
+                new MessageProcessorFunction<P>() {
+                    @Override
+                    public <M extends MessageProcessor<P>> P apply(P context, M processor) {
+                        return processor.apply(context);
+                    }
+                };
+
+        return computeMessageProcessorChain(messageProcessors, initialProcessorContext,
+                messageProcessorFunction);
+
+    }
+
+}