001    /*
002     * Copyright (c) 2007-2015 Concurrent, Inc. All Rights Reserved.
003     *
004     * Project and contact information: http://www.cascading.org/
005     *
006     * This file is part of the Cascading project.
007     *
008     * Licensed under the Apache License, Version 2.0 (the "License");
009     * you may not use this file except in compliance with the License.
010     * You may obtain a copy of the License at
011     *
012     *     http://www.apache.org/licenses/LICENSE-2.0
013     *
014     * Unless required by applicable law or agreed to in writing, software
015     * distributed under the License is distributed on an "AS IS" BASIS,
016     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017     * See the License for the specific language governing permissions and
018     * limitations under the License.
019     */
020    
021    package cascading.flow;
022    
023    import java.io.IOException;
024    
025    /**
026     * Interface FlowSkipStrategy is used to create new strategies that decide when a {@link Flow} should
027     * be skipped when executed in a {@link cascading.cascade.Cascade}. The default strategy is
028     * {@link FlowSkipIfSinkNotStale}.
029     *
030     * @see cascading.flow.FlowSkipIfSinkExists
031     * @see FlowSkipIfSinkNotStale
032     */
033    public interface FlowSkipStrategy
034      {
035      boolean skipFlow( Flow flow ) throws IOException;
036      }