ScheduledFetches.java example

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incubator-tajo-master
/*
 * 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.tajo.master;

import java.net.URI;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

public class ScheduledFetches {
  private List<Map<String, List<URI>>> fetches = new ArrayList<Map<String, List<URI>>>();

  public void addFetch(Map<String, List<URI>> fetch) {
    this.fetches.add(fetch);
  }

  public boolean hasNextFetch() {
    return fetches.size() > 0;
  }

  public Map<String, List<URI>> getNextFetch() {
    return hasNextFetch() ? fetches.get(0) : null;
  }

  public Map<String, List<URI>> popNextFetch() {
    return hasNextFetch() ? fetches.remove(0) : null;
  }

  public int size() {
    return fetches.size();
  }
}