Github user jdasch commented on a diff in the pull request:
https://github.com/apache/incubator-rya/pull/220#discussion_r136646583
--- Diff:
extras/rya.pcj.fluo/pcj.fluo.api/src/main/java/org/apache/rya/indexing/pcj/fluo/api/CreatePeriodicQuery.java
---
@@ -0,0 +1,214 @@
+/*
+ * 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.rya.indexing.pcj.fluo.api;
+
+import java.util.Optional;
+
+import org.apache.accumulo.core.client.Connector;
+import org.apache.fluo.api.client.FluoClient;
+import org.apache.rya.api.client.CreatePCJ.ExportStrategy;
+import org.apache.rya.indexing.pcj.fluo.app.query.FluoQuery;
+import org.apache.rya.indexing.pcj.fluo.app.query.PeriodicQueryNode;
+import
org.apache.rya.indexing.pcj.fluo.app.query.UnsupportedQueryException;
+import org.apache.rya.indexing.pcj.fluo.app.util.FluoQueryUtils;
+import org.apache.rya.indexing.pcj.fluo.app.util.PeriodicQueryUtil;
+import org.apache.rya.indexing.pcj.storage.PeriodicQueryResultStorage;
+import org.apache.rya.indexing.pcj.storage.PeriodicQueryStorageException;
+import org.apache.rya.periodic.notification.api.PeriodicNotificationClient;
+import
org.apache.rya.periodic.notification.notification.PeriodicNotification;
+import org.openrdf.query.MalformedQueryException;
+import org.openrdf.query.algebra.evaluation.function.Function;
+
+import com.google.common.collect.Sets;
+
+
+/**
+ * Object that creates a Periodic Query. A Periodic Query is any query
+ * requesting periodic updates about events that occurred within a given
+ * window of time of this instant. This is also known as a rolling window
+ * query. Period Queries can be expressed using SPARQL by including the
+ * {@link Function} indicated by the URI {@link
PeriodicQueryUtil#PeriodicQueryURI}
+ * in the query. The user must provide this Function with the following
arguments:
+ * the temporal variable in the query that will be filtered on, the window
of time
+ * that events must occur within, the period at which the user wants to
receive updates,
+ * and the time unit. The following query requests all observations that
occurred
+ * within the last minute and requests updates every 15 seconds. It also
performs
+ * a count on those observations.
+ * <li>
+ * <li> prefix function: http://org.apache.rya/function#
+ * <li> "prefix time: http://www.w3.org/2006/time#
+ * <li> "select (count(?obs) as ?total) where {
+ * <li> "Filter(function:periodic(?time, 1, .25,
time:minutes))
+ * <li> "?obs uri:hasTime ?time.
+ * <li> "?obs uri:hasId ?id }
+ * <li>
--- End diff --
Remove the `<li>` tags and replace with
```
<pre>
your preformatted content
</pre>
```
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