Github user joshelser commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/260#discussion_r120022426
--- Diff:
core/src/main/java/org/apache/accumulo/core/iterators/YieldCallback.java ---
@@ -0,0 +1,57 @@
+/*
+ * 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.accumulo.core.iterators;
+
+/**
+ * This callback handles the state of yielding within an iterator
+ */
+public class YieldCallback<K> {
+ private K key;
+
+ /**
+ * Called by the iterator when a next or seek call yields control.
+ *
+ * @param key
+ * the key position at which the iterator yielded.
+ */
+ public void yield(K key) {
+ this.key = key;
+ }
+
+ /**
+ * Called by the client to see if the iterator yielded
+ *
+ * @return true if iterator yielded control
+ */
+ public boolean hasYielded() {
+ return (this.key != null);
+ }
+
+ /**
+ * Called by the client to get the yield position used as the start key
(non-inclusive) of the range in a subsequent seek call when the iterator is
rebuilt.
+ * This will also reset the state returned by hasYielded.
+ *
+ * @return <tt>K</tt> The key position
+ */
+ public K getPositionAndReset() {
--- End diff --
Great. That's why I asked.
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