FeedPathStore.java

/**
 * 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.falcon.entity.store;

import org.apache.falcon.util.FalconRadixUtils;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.Collection;

/**
 * A <Key, Value> Store to store values against Feed Locations.
 *
 * @param <T>
 */
public interface FeedPathStore<T> {

    void insert(@Nullable String key, @Nonnull T value);

    int getSize();

    @Nullable
    Collection<T> find(@Nonnull String key, @Nonnull FalconRadixUtils.INodeAlgorithm algorithm);

    @Nullable
    Collection<T> find(@Nonnull String key);

    boolean delete(@Nonnull String key, @Nonnull T value);

}