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Log4j2 Appender plugin pushing logs in batches to Elasticsearch (2.x/5.x/6.x/7.x/8.x) clusters

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package org.appenders.log4j2.elasticsearch.hc;

/*-
 * #%L
 * log4j2-elasticsearch
 * %%
 * Copyright (C) 2019 Rafal Foltynski
 * %%
 * Licensed 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.
 * #L%
 */

import org.apache.http.HttpResponse;
import org.apache.http.nio.protocol.HttpAsyncResponseConsumer;
import org.apache.http.nio.util.SimpleInputBuffer;
import org.appenders.log4j2.elasticsearch.GenericItemSourcePool;
import org.appenders.log4j2.elasticsearch.LifeCycle;

/**
 * Allows to create pooled response consumer
 */
public class PoolingAsyncResponseConsumerFactory implements HttpAsyncResponseConsumerFactory, LifeCycle {

    private volatile State state = State.STOPPED;

    private final GenericItemSourcePool pool;

    public PoolingAsyncResponseConsumerFactory(GenericItemSourcePool pool) {
        this.pool = pool;
    }

    @Override
    public HttpAsyncResponseConsumer create() {
        return new PoolingAsyncResponseConsumer(pool);
    }

    // ==========
    // LIFECYCLE
    // ==========

    @Override
    public void start() {

        if (!isStarted()) {
            pool.start();
            state = State.STARTED;
        }

    }

    @Override
    public void stop() {

        if (!isStopped()) {
            pool.stop();
            state = State.STOPPED;
        }

    }

    @Override
    public boolean isStarted() {
        return state == State.STARTED;
    }

    @Override
    public boolean isStopped() {
        return state == State.STOPPED;
    }

}