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A thundr module for supporting metrics in big query
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/*
 * This file is a component of thundr, a software library from 3wks.
 * Read more: http://www.3wks.com.au/thundr
 * Copyright (C) 2014 3wks, 
 *
 * 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.
 */
package com.threewks.thundr.bigmetrics.controller;

import java.util.Map;

import com.threewks.thundr.bigmetrics.BigMetricsService;
import com.threewks.thundr.bigmetrics.bigquery.BigQueryService;
import com.threewks.thundr.http.StatusCode;
import com.threewks.thundr.logger.Logger;
import com.threewks.thundr.view.string.StringView;

/**
 * Controller handling endpoint events for the queues
 */
public class EventQueueController {

	private BigMetricsService bigMetricsService;
	private BigQueryService bigQueryService;

	public EventQueueController(BigMetricsService bigMetricsService, BigQueryService bigQueryService) {
		this.bigMetricsService = bigMetricsService;
		this.bigQueryService = bigQueryService;
	}

	/**
	 * The endpoint for the queue that handles the insertion of the event into the big query datastore.
	 *
	 * @param xAppengineTaskname the header X-AppEngine-TaskName added by GAE - used as the unique key for the big query
	 *            insert request. Note: Thundr converts the header into the name xAppengineTaskname
	 * @param tableId the table id to insert the event record for
	 * @param data the data for the event - provided as a key -> value map
	 * @return an OK string view if all went well
	 */
	public StringView addEvent(String xAppengineTaskname, String tableId, Map data) {
		try {
			bigQueryService.insert(xAppengineTaskname, tableId, data);
			return new StringView("OK").withStatusCode(StatusCode.OK);
		} catch (Exception e) {
			String errorMsg = "Failed to process event for tableId: %s - Error Message: %s";
			Logger.error(errorMsg, tableId, e.getMessage());
			return new StringView(errorMsg, tableId, e.getMessage()).withStatusCode(StatusCode.InternalServerError);
		}
	}

	/**
	 * Ensures that the views in bigquery are up to date with all event tables.
	 * 
	 * @return a string view with status code representing the outcome
	 */
	public StringView ensureViews() {
		try {
			bigMetricsService.ensureViewsExist();
			return new StringView("OK");
		} catch (Exception e) {
			Logger.error("Failed to ensure big metrics views are up to date: %s", e.getMessage());
			return new StringView(String.format("Failed to ensure big metrics views are up to date: %s", e.getMessage())).withStatusCode(StatusCode.InternalServerError);
		}
	}

	/**
	 * Ensures that the tables in bigquery are up to date with all event tables.
	 * 
	 * @return a string view with status code representing the outcome
	 */
	public StringView ensureTables() {
		try {
			bigMetricsService.ensureTablesExist();
			return new StringView("OK");
		} catch (Exception e) {
			Logger.error("Failed to ensure big metrics tables are up to date: %s", e.getMessage());
			return new StringView(String.format("Failed to ensure big metrics tables are up to date: %s", e.getMessage())).withStatusCode(StatusCode.InternalServerError);
		}
	}

}