Github user olegz commented on a diff in the pull request:
https://github.com/apache/nifi/pull/199#discussion_r51443924
--- Diff:
nifi-nar-bundles/nifi-amqp-bundle/nifi-amqp-processors/src/main/java/org/apache/nifi/amqp/processors/AMQPWorker.java
---
@@ -0,0 +1,104 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+package org.apache.nifi.amqp.processors;
+
+import java.io.IOException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.rabbitmq.client.Channel;
+import com.rabbitmq.client.Connection;
+
+/**
+ * Base class for implementing publishing and consuming AMQP workers.
+ *
+ * @see AMQPPublisher
+ * @see AMQPConsumer
+ */
+abstract class AMQPWorker implements AutoCloseable {
+
+ private final static Logger logger =
LoggerFactory.getLogger(AMQPWorker.class);
+
+ protected final Channel channel;
+
+ /**
+ * Creates an instance of this worker initializing it with AMQP
+ * {@link Connection} and creating a target {@link Channel} used by
+ * sub-classes to interruct with AMQP-based messaging system.
+ *
+ * @param connection
+ * instance of {@link Connection}
+ */
+ public AMQPWorker(Connection connection) {
+ this.validateConnection(connection);
+ try {
+ this.channel = connection.createChannel();
+ } catch (IOException e) {
+ logger.error("Failed to create Channel for " + connection, e);
+ throw new IllegalStateException(e);
+ }
+ }
+
+ /**
+ * Closes {@link Channel} created when instance of this class was
created.
+ */
+ @Override
+ public void close() throws Exception {
+ if (logger.isDebugEnabled()) {
+ logger.info("Closing AMQP channel for " +
this.channel.getConnection().toString());
--- End diff --
oopos
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