oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/storage/BlockingBatchQueue.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.skywalking.oap.server.core.storage;

import java.util.List;

/**
 * A blocking queue implementation for persistent process.
 * Poll method only returns when it matches the threshold or no further appending declared.
 */
interface BlockingBatchQueue<E> {
    List<E> poll() throws InterruptedException;

    void offer(List<E> elements);

    void noFurtherAppending();

    void furtherAppending();

    int size();
}