/**
 * 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.storm.metrics2;

import com.codahale.metrics.Counter;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.apache.storm.task.WorkerTopologyContext;

public class TaskMetrics {
    private static final String METRIC_NAME_ACKED = "acked";
    private static final String METRIC_NAME_FAILED = "failed";
    private static final String METRIC_NAME_EMITTED = "emitted";
    private static final String METRIC_NAME_TRANSFERRED = "transferred";

    private final ConcurrentMap<String, Counter> ackedByStream = new ConcurrentHashMap<>();
    private final ConcurrentMap<String, Counter> failedByStream = new ConcurrentHashMap<>();
    private final ConcurrentMap<String, Counter> emittedByStream = new ConcurrentHashMap<>();
    private final ConcurrentMap<String, Counter> transferredByStream = new ConcurrentHashMap<>();

    private final String topologyId;
    private final String componentId;
    private final Integer taskId;
    private final Integer workerPort;
    private final StormMetricRegistry metricRegistry;

    public TaskMetrics(WorkerTopologyContext context, String componentId, Integer taskid, StormMetricRegistry metricRegistry) {
        this.metricRegistry = metricRegistry;
        this.topologyId = context.getStormId();
        this.componentId = componentId;
        this.taskId = taskid;
        this.workerPort = context.getThisWorkerPort();
    }

    public Counter getAcked(String streamId) {
        Counter c = this.ackedByStream.get(streamId);
        if (c == null) {
            c = metricRegistry.counter(METRIC_NAME_ACKED, this.topologyId, this.componentId, this.taskId, this.workerPort, streamId);
            this.ackedByStream.put(streamId, c);
        }
        return c;
    }

    public Counter getFailed(String streamId) {
        Counter c = this.failedByStream.get(streamId);
        if (c == null) {
            c = metricRegistry.counter(METRIC_NAME_FAILED, this.topologyId, this.componentId, this.taskId, this.workerPort, streamId);
            this.failedByStream.put(streamId, c);
        }
        return c;
    }

    public Counter getEmitted(String streamId) {
        Counter c = this.emittedByStream.get(streamId);
        if (c == null) {
            c = metricRegistry.counter(METRIC_NAME_EMITTED, this.topologyId, this.componentId, this.taskId, this.workerPort, streamId);
            this.emittedByStream.put(streamId, c);
        }
        return c;
    }

    public Counter getTransferred(String streamId) {
        Counter c = this.transferredByStream.get(streamId);
        if (c == null) {
            c = metricRegistry.counter(
                METRIC_NAME_TRANSFERRED, this.topologyId, this.componentId, this.taskId, this.workerPort, streamId);
            this.transferredByStream.put(streamId, c);
        }
        return c;
    }
}