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From joshelser <...@git.apache.org>
Subject [GitHub] accumulo pull request #260: ACCUMULO-4643 initial implementation
Date Sun, 04 Jun 2017 22:17:41 GMT
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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