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This module contains InfluxDB output writers.
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/**
 * The MIT License
 * Copyright © 2010 JmxTrans team
 *
 * 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.
 */
package com.googlecode.jmxtrans.model.output;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.googlecode.jmxtrans.model.OutputWriterFactory;
import com.googlecode.jmxtrans.model.ResultAttribute;
import com.googlecode.jmxtrans.model.output.support.ResultTransformerOutputWriter;
import org.apache.commons.lang.StringUtils;
import org.influxdb.InfluxDB;
import org.influxdb.InfluxDBFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Collections;
import java.util.EnumSet;
import java.util.List;

import static com.google.common.base.MoreObjects.firstNonNull;
import static com.google.common.collect.Sets.immutableEnumSet;
import static java.lang.Boolean.TRUE;

public class InfluxDbWriterFactory implements OutputWriterFactory {

	private static final Logger LOG = LoggerFactory.getLogger(InfluxDbWriterFactory.class);

	/**
	 * The deault 
	 * The retention policy for each measuremen where no retentionPolicy
	 * setting is provided in the json config
	 */
	private static final String DEFAULT_RETENTION_POLICY = "autogen";

	private final String database;
	private final InfluxDB.ConsistencyLevel writeConsistency;
	private final ImmutableMap tags;
	private final String retentionPolicy;
	private final InfluxDB influxDB;
	private final ImmutableSet resultAttributesToWriteAsTags;
	private final boolean booleanAsNumber;
	private final boolean createDatabase;

	/**
	 * @param url      - The url e.g http://localhost:8086 to InfluxDB
	 * @param username - The username for InfluxDB
	 * @param password - The password for InfluxDB
	 * @param database - The name of the database (created if does not exist) on
	 */
	@JsonCreator
	public InfluxDbWriterFactory(
			@JsonProperty("typeNames") ImmutableList typeNames,
			@JsonProperty("booleanAsNumber") boolean booleanAsNumber,
			@JsonProperty("url") String url,
			@JsonProperty("username") String username,
			@JsonProperty("password") String password,
			@JsonProperty("database") String database,
			@JsonProperty("tags") ImmutableMap tags,
			@JsonProperty("writeConsistency") String writeConsistency,
			@JsonProperty("retentionPolicy") String retentionPolicy,
			@JsonProperty("resultTags") List resultTags,
			@JsonProperty("createDatabase") Boolean createDatabase) {
		this.booleanAsNumber = booleanAsNumber;
		this.database = database;
		this.createDatabase = firstNonNull(createDatabase, TRUE);

		this.writeConsistency = StringUtils.isNotBlank(writeConsistency)
				? InfluxDB.ConsistencyLevel.valueOf(writeConsistency) : InfluxDB.ConsistencyLevel.ALL;

		this.retentionPolicy = StringUtils.isNotBlank(retentionPolicy) ? retentionPolicy : DEFAULT_RETENTION_POLICY;

		this.resultAttributesToWriteAsTags = initResultAttributesToWriteAsTags(resultTags);
		this.tags = initCustomTagsMap(tags);
		LOG.debug("Connecting to url: {} as: username: {}", url, username);

		influxDB = InfluxDBFactory.connect(url, username, password);
	}


	private ImmutableMap initCustomTagsMap(ImmutableMap tags) {
		return ImmutableMap.copyOf(firstNonNull(tags, Collections.emptyMap()));
	}

	private ImmutableSet initResultAttributesToWriteAsTags(List resultTags) {
		EnumSet resultAttributes = EnumSet.noneOf(ResultAttribute.class);
		if (resultTags != null) {
			for (String resultTag : resultTags) {
				resultAttributes.add(ResultAttribute.fromAttribute(resultTag));
			}
		} else {
			resultAttributes = EnumSet.allOf(ResultAttribute.class);
		}

		ImmutableSet result = immutableEnumSet(resultAttributes);
		LOG.debug("Result Tags to write set to: {}", result);
		return result;
	}

	@Override
	public ResultTransformerOutputWriter create() {
		return ResultTransformerOutputWriter.booleanToNumber(booleanAsNumber, new InfluxDbWriter(influxDB, database,
				writeConsistency, retentionPolicy, tags, resultAttributesToWriteAsTags, createDatabase));
	}
}