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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
 * log4j2-elasticsearch
 * %%
 * Copyright (C) 2018 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 io.searchbox.action.BulkableAction;
import io.searchbox.core.Bulk;
import io.searchbox.core.Index;
import io.searchbox.params.Parameters;
import org.apache.logging.log4j.core.config.ConfigurationException;
import org.appenders.log4j2.elasticsearch.BatchBuilder;
import org.appenders.log4j2.elasticsearch.BatchOperations;
import org.appenders.log4j2.elasticsearch.ItemSource;

public class JestBulkOperations implements BatchOperations {

    public static final String DEFAULT_MAPPING_TYPE = null;

    /**
     * {@code null} since 1.6
     */
    private final String mappingType;
    private final String opType;

    public JestBulkOperations() {
        this(false);
    }

    public JestBulkOperations(final String mappingType) {
        this.mappingType = mappingType;
        this.opType = "index";
    }

    public JestBulkOperations(final boolean dataStreamsEnabled) {
        this.mappingType = null;
        this.opType = dataStreamsEnabled ? "create" : "index";
    }

    @Override
    public Object createBatchItem(final String indexName, final Object source) {
        return new Index.Builder(source)
                .index(indexName)
                .type(mappingType)
                .setParameter(Parameters.OP_TYPE, opType)
                .build();
    }

    @Override
    public Object createBatchItem(final String indexName, final ItemSource source) {
        if (source.getSource() instanceof String) {
            return new Index.Builder(source.getSource())
                    .index(indexName)
                    .type(mappingType)
                    .setParameter(Parameters.OP_TYPE, opType)
                    .build();
        }
        throw new ConfigurationException("Non String payloads are not supported by this factory. Make sure that proper ClientObjectFactory implementation is configured");
    }

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

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

            @Override
            public void add(Object item) {
                builder.addAction((BulkableAction) item);
            }

            @Override
            public Bulk build() {
                return builder.build();
            }
        };
    }

}