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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.flink.configuration;

import org.apache.flink.annotation.PublicEvolving;

import static org.apache.flink.configuration.ConfigOptions.key;

/**
 * Configuration options for metrics and metric reporters.
 */
@PublicEvolving
public class MetricOptions {

	/**
	 * An optional list of reporter names. If configured, only reporters whose name matches any of the names in the list
	 * will be started. Otherwise, all reporters that could be found in the configuration will be started.
	 *
	 * Example:
	 * 
{@code
	 * metrics.reporters = foo,bar
	 *
	 * metrics.reporter.foo.class = org.apache.flink.metrics.reporter.JMXReporter
	 * metrics.reporter.foo.interval = 10
	 *
	 * metrics.reporter.bar.class = org.apache.flink.metrics.graphite.GraphiteReporter
	 * metrics.reporter.bar.port = 1337
	 * }
	 */
	public static final ConfigOption REPORTERS_LIST =
		key("metrics.reporters")
			.noDefaultValue();

	public static final ConfigOption REPORTER_CLASS =
		key("metrics.reporter..class")
			.noDefaultValue()
			.withDescription("The reporter class to use for the reporter named .");

	public static final ConfigOption REPORTER_INTERVAL =
		key("metrics.reporter..interval")
			.noDefaultValue()
			.withDescription("The reporter interval to use for the reporter named .");

	public static final ConfigOption REPORTER_CONFIG_PARAMETER =
		key("metrics.reporter..")
			.noDefaultValue()
			.withDescription("Configures the parameter  for the reporter named .");

	public static final ConfigOption FAIL_ON_REPORTER_NOT_INSTANTIATED =
		key(String.format("metrics.reporter..%s", ConfigConstants.METRICS_REPORTER_FAIL_ON_NOT_INSTANTIATED))
		.defaultValue(false)
		.withDescription("The reporter would fail on not instantiated successfully.");

	/** The delimiter used to assemble the metric identifier. */
	public static final ConfigOption SCOPE_DELIMITER =
		key("metrics.scope.delimiter")
			.defaultValue(".");

	/** The scope format string that is applied to all metrics scoped to a JobManager. */
	public static final ConfigOption SCOPE_NAMING_JM =
		key("metrics.scope.jm")
			.defaultValue(".jobmanager")
			.withDescription("Defines the scope format string that is applied to all metrics scoped to a JobManager.");

	/** The scope format string that is applied to all metrics scoped to a TaskManager. */
	public static final ConfigOption SCOPE_NAMING_TM =
		key("metrics.scope.tm")
			.defaultValue(".taskmanager.")
			.withDescription("Defines the scope format string that is applied to all metrics scoped to a TaskManager.");

	/** The scope format string that is applied to all metrics scoped to a job on a JobManager. */
	public static final ConfigOption SCOPE_NAMING_JM_JOB =
		key("metrics.scope.jm.job")
			.defaultValue(".jobmanager.")
			.withDescription("Defines the scope format string that is applied to all metrics scoped to a job on a JobManager.");

	/** The scope format string that is applied to all metrics scoped to a job on a TaskManager. */
	public static final ConfigOption SCOPE_NAMING_TM_JOB =
		key("metrics.scope.tm.job")
			.defaultValue(".taskmanager..")
			.withDescription("Defines the scope format string that is applied to all metrics scoped to a job on a TaskManager.");

	/** The scope format string that is applied to all metrics scoped to a task. */
	public static final ConfigOption SCOPE_NAMING_TASK =
		key("metrics.scope.task")
			.defaultValue(".taskmanager....")
			.withDescription("Defines the scope format string that is applied to all metrics scoped to a task.");

	/** The scope format string that is applied to all metrics scoped to an operator. */
	public static final ConfigOption SCOPE_NAMING_OPERATOR =
		key("metrics.scope.operator")
			.defaultValue(".taskmanager....")
			.withDescription("Defines the scope format string that is applied to all metrics scoped to an operator.");

	/** The number of measured latencies to maintain at each operator. */
	public static final ConfigOption LATENCY_HISTORY_SIZE =
		key("metrics.latency.history-size")
			.defaultValue(128)
			.withDescription("Defines the number of measured latencies to maintain at each operator.");

	/** The sampling rate of tracing metric based on records count. */
	public static final ConfigOption TRACING_SAMPLE_COUNT_INTERVAL =
		key("metrics.tracing.sample.count-interval")
			.defaultValue(100);

	public static final ConfigOption PROCESS_TREE_TM_METRICS_ENABLED =
		key("metrics.process-tree.tm.enabled")
			.defaultValue(false)
			.withDescription("Enable process-tree metrics of TM.");

	public static final ConfigOption PROCESS_TREE_TM_METRICS_UPDATE_INTERVAL =
		key("metrics.process-tree.tm.update-interval")
			.defaultValue(10000L)
			.withDescription("Interval of updating process-tree metrics of TM in milliseconds.");

	public static final ConfigOption PROCESS_TREE_TM_METRICS_SMAPS_BASED_ENABLED =
		key("metrics.process-tree.tm.smaps-based.enabled")
			.defaultValue(false)
			.withDescription("Enable smaps based process-tree metrics of TM, only works when " +
				PROCESS_TREE_TM_METRICS_ENABLED.key() + " is enabled.");

	private MetricOptions() {
	}
}