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

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package org.appenders.log4j2.elasticsearch.jest;

/*-
 * #%L
 * %%
 * Copyright (C) 2017 Rafal Foltynski
 * %%
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * #L%
 */


import io.searchbox.action.BulkableAction;
import io.searchbox.core.Bulk;
import io.searchbox.core.Index;
import org.appenders.log4j2.elasticsearch.BatchBuilder;
import org.appenders.log4j2.elasticsearch.BatchOperations;

public class JestBulkOperations implements BatchOperations {

    private static String ACTION_TYPE = "index";

    private final BuilderLock builderLock = new BuilderLock();

    @Override
    public Object createBatchItem(String indexName, Object source) {
        return new Index.Builder(source)
                .index(indexName)
                .type(ACTION_TYPE)
                .build();
    }

    @Override
    public BatchBuilder createBatchBuilder() {
        return new BatchBuilder() {

            private final Bulk.Builder builder = new Bulk.Builder();

            @Override
            public void add(Object item) {
                // has to be synchronized until https://github.com/searchbox-io/Jest/issues/517 is resolved
                synchronized (builderLock) {
                    builder.addAction((BulkableAction) item);
                }
            }
            @Override
            public Bulk build() {
                return builder.build();
            }
        };
    }

    /*
     * Class used as monitor to increase lock visibility in profiling tools
     */
    private class BuilderLock {
    }
}