Github user mikewalch commented on a diff in the pull request:
https://github.com/apache/incubator-fluo/pull/817#discussion_r107179559
--- Diff:
modules/api/src/main/java/org/apache/fluo/api/observer/ObserverFactory.java ---
@@ -0,0 +1,119 @@
+/*
+ * 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.fluo.api.observer;
+
+import java.util.function.BiConsumer;
+
+import org.apache.fluo.api.client.FluoClient;
+import org.apache.fluo.api.config.FluoConfiguration;
+import org.apache.fluo.api.config.SimpleConfiguration;
+import org.apache.fluo.api.data.Bytes;
+import org.apache.fluo.api.data.Column;
+import org.apache.fluo.api.metrics.MetricsReporter;
+import org.apache.fluo.api.observer.Observer.NotificationType;
+
+/**
+ * Fluo Workers use this class to create {@link Observer}s to process
notifications. Implementations
+ * of this class should emit zero or more {@link Observer}s.
+ *
+ * <p>
+ * When Fluo is initialized {@link #getObservedColumns(BiConsumer,
Context)} is called. The columns
+ * it emits are stored in Zookeeper. Transactions will use the columns
stored in Zookeeper to
+ * determine when to set notifications. When Workers call
+ * {@link #createObservers(ObserverConsumer, Context)}, the columns
emitted must be the same as
+ * those emitted during initialization. If this is not the case, then the
worker will fail to start.
+ *
+ * @see FluoConfiguration#setObserversFactory(String)
+ * @since 1.1.0
+ */
+public interface ObserverFactory {
+
+ /**
+ * @since 1.1.0
+ */
+ interface Context {
+ /**
+ * @return A configuration object with application configuration like
that returned by
+ * {@link FluoClient#getAppConfiguration()}
+ */
+ SimpleConfiguration getAppConfiguration();
+
+ /**
+ * @return A {@link MetricsReporter} to report application metrics
from observers.
+ */
+ MetricsReporter getMetricsReporter();
+ }
+
+ /**
+ * Observers are emitted to the worker using this interface. This
interface also allows
+ * {@link Observer}s to be related to the columns that trigger them.
+ *
+ * @since 1.1.0
+ */
+ interface ObserverConsumer {
+ void accept(Column observedColumn, NotificationType ntfyType, Observer
observer);
--- End diff --
This method could be `add` or `register`
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