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From ivakegg <...@git.apache.org>
Subject [GitHub] accumulo pull request #260: ACCUMULO-4643 initial implementation
Date Sat, 03 Jun 2017 18:47:11 GMT
Github user ivakegg commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/260#discussion_r119992351
  
    --- Diff: iterator-test-harness/src/main/java/org/apache/accumulo/iteratortest/testcases/YieldingTestCase.java
---
    @@ -0,0 +1,77 @@
    +/*
    + * 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.iteratortest.testcases;
    +
    +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.SortedKeyValueIterator;
    +import org.apache.accumulo.core.iterators.YieldCallback;
    +import org.apache.accumulo.iteratortest.IteratorTestInput;
    +import org.apache.accumulo.iteratortest.IteratorTestOutput;
    +import org.apache.accumulo.iteratortest.IteratorTestUtil;
    +import org.apache.accumulo.iteratortest.environments.SimpleIteratorEnvironment;
    +
    +import java.io.IOException;
    +import java.util.TreeMap;
    +
    +/**
    + * Test case that verifies that an iterator works correctly with the yielding api. Note
that most iterators do nothing in terms of yielding in which case this
    + * merely tests that the iterator produces the correct output. If however the iterator
does override the yielding api, then this ensures that it works correctly
    + * iff the iterator actually decides to yield. Nothing can force an iterator to yield
without knowing something about the internals of the iterator being
    + * tested.
    + */
    +public class YieldingTestCase extends OutputVerifyingTestCase {
    --- End diff --
    
    I thought that this structure was a reasonable mechanism to ensure that the basic expectations
of an iterator are met.  In this case, I am not positive it adds much because this test case
by itself cannot force the implemented iterator to yield.  However if the implementer could
provide a mechanism to force his/her iterator to yield, then this might prove useful.


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