Github user joshelser commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/260#discussion_r119116912
--- Diff:
test/src/main/java/org/apache/accumulo/test/functional/YieldingIterator.java ---
@@ -0,0 +1,88 @@
+/*
+ * 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.test.functional;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+import org.apache.accumulo.core.data.ByteSequence;
+import org.apache.accumulo.core.data.Key;
+import org.apache.accumulo.core.data.Range;
+import org.apache.accumulo.core.data.Value;
+import org.apache.accumulo.core.iterators.IteratorEnvironment;
+import org.apache.accumulo.core.iterators.SortedKeyValueIterator;
+import org.apache.accumulo.core.iterators.WrappingIterator;
+import org.apache.accumulo.core.iterators.user.ScanYieldException;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.concurrent.atomic.AtomicInteger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * This iterator will throw a ScanYieldException every other key
+ */
+public class YieldingIterator extends WrappingIterator {
+ private static final Logger log =
LoggerFactory.getLogger(YieldingIterator.class);
+ private static final AtomicInteger yieldNexts = new AtomicInteger(0);
+ private static final AtomicInteger yieldSeeks = new AtomicInteger(0);
+ private static final AtomicInteger rebuilds = new AtomicInteger(0);
+
+ private static final AtomicBoolean yieldNextKey = new
AtomicBoolean(false);
+ private static final AtomicBoolean yieldSeekKey = new
AtomicBoolean(false);
+
+ @Override
+ public SortedKeyValueIterator<Key,Value> deepCopy(IteratorEnvironment
env) {
+ YieldingIterator it = new YieldingIterator();
+ it.setSource(it.getSource().deepCopy(env));
+ return it;
+ }
+
+ @Override
+ public void next() throws IOException {
+ log.info("start YieldingIterator.next: " + getTopValue());
+ yieldNextKey.set(!yieldNextKey.get());
+ if (yieldNextKey.get()) {
+ log.info("YieldingIterator.next yielding: " + getTopValue());
+ yieldNexts.incrementAndGet();
+ throw new ScanYieldException(getTopKey());
+ }
+ super.next();
+ log.info("end YieldingIterator.next: " + (hasTop() ? getTopKey() + " "
+ getTopValue() : "no top"));
+ }
+
+ @Override
+ public Value getTopValue() {
+ String value = Integer.toString(yieldNexts.get()) + ',' +
Integer.toString(yieldSeeks.get()) + ',' + Integer.toString(rebuilds.get());
--- End diff --
Tricky :)
Could you add a quick sentence to the class-level javadoc describing this?
Would help when the next person comes along to this Iterator.
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