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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) 2020 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.client.JestResult;
import org.appenders.log4j2.elasticsearch.ILMPolicy;
import org.appenders.log4j2.elasticsearch.OpSource;
import org.appenders.log4j2.elasticsearch.Operation;
import org.appenders.log4j2.elasticsearch.OperationFactory;
import org.appenders.log4j2.elasticsearch.SetupStep;
import org.appenders.log4j2.elasticsearch.SkippingSetupStepChain;
import org.appenders.log4j2.elasticsearch.StepProcessor;
import org.appenders.log4j2.elasticsearch.ValueResolver;

import java.util.ArrayList;
import java.util.List;

public class ILMPolicySetupOp implements OperationFactory {

    private final StepProcessor> stepProcessor;
    private final ValueResolver valueResolver;

    public ILMPolicySetupOp(
            final StepProcessor> stepProcessor,
            final ValueResolver valueResolver) {
        this.stepProcessor = stepProcessor;
        this.valueResolver = valueResolver;
    }


    @Override
    public  Operation create(final T opSource) {

        final ILMPolicy ilmPolicy = (ILMPolicy)opSource;
        final List> setupSteps = new ArrayList<>();

        if (ilmPolicy.isCreateBootstrapIndex()) {

            setupSteps.add(new CheckBootstrapIndex(ilmPolicy.getRolloverAlias()));
            setupSteps.add(new CreateBootstrapIndex(ilmPolicy.getRolloverAlias()));

        }

        final SetupStep updateIlmPolicy = new PutILMPolicy(
                ilmPolicy.getName(),
                valueResolver.resolve(ilmPolicy.getSource()));
        setupSteps.add(updateIlmPolicy);

        return new SkippingSetupStepChain<>(setupSteps, stepProcessor);

    }
}