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From ddebrunner <...@git.apache.org>
Subject [GitHub] incubator-quarks pull request: [QUARKS-107] create SimulatedTemper...
Date Wed, 06 Apr 2016 16:25:46 GMT
Github user ddebrunner commented on a diff in the pull request:

    https://github.com/apache/incubator-quarks/pull/75#discussion_r58736939
  
    --- Diff: samples/utils/src/main/java/quarks/samples/utils/sensor/SimulatedTemperatureSensor.java
---
    @@ -0,0 +1,115 @@
    +/*
    +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 quarks.samples.utils.sensor;
    +
    +import java.text.DecimalFormat;
    +import java.util.Objects;
    +import java.util.Random;
    +
    +import quarks.analytics.sensors.Range;
    +import quarks.analytics.sensors.Ranges;
    +import quarks.function.Supplier;
    +
    +/**
    + * A Simulated temperature sensor.
    + * <p>
    + * The sensor starts off with an initial value.
    + * Each call to {@link #get()} changes the current value by
    + * a random amount between plus/minus a {@code deltaFactor}.
    + * The new current value is limited to a {@code maxTempRange}.
    + * <p>
    + * No temperature scale is implied (e.g., Fahrenheit, Kelvin, ...).
    + * The {@code double} temperature values are simply generated as described.
    + * The user of the class decides how to interpret them.
    + * <p>
    + * Sample use:
    + * <pre>{@code
    + * Topology t = ...;
    + * SimulatedTemperatureSensor tempSensor = new SimulatedTemperatureSensor();
    + * TStream<Double> temp = t.poll(tempSensor, 1, TimeUnit.SECONDS);
    + * }</pre>
    + */
    +public class SimulatedTemperatureSensor implements Supplier<Double> {
    +    private static final long serialVersionUID = 1L;
    +    private static DecimalFormat df = new DecimalFormat("#.#");
    +    private Random r = new Random();
    +    private final Range<Double> maxTempRange;
    +    private final double deltaFactor;
    +    private double currentTemp;
    +   
    +    /**
    +     * Create a temperature sensor.
    +     * <p>
    +     * Same as {@code SimulatedTemperatureSensor(80.0, 
    +     *              Ranges.closed(28.0, 112.0), 1.0)}
    +     * <p>
    +     * These default values roughly correspond to normal air temperature
    +     * in the Fahrenheit scale.
    +     */
    +    public SimulatedTemperatureSensor() {
    +        this(80.0, Ranges.closed(28.0, 112.0), 1.0);
    +    }
    +    
    +    /**
    +     * Create a temperature sensor.
    +     * <p>
    +     * No temperature scale is implied. 
    +     * @param initialTemp the initial temperature.  Must be within maxTempRange.
    +     * @param maxTempRange maximum sensor value range
    +     * @param deltaFactor maximum plus/minus change on each {@code get()}.
    +     *              e.g., 1.0 to limit change to +/- 1.0.
    +     *              Must be > 0.0
    +     */
    +    public SimulatedTemperatureSensor(double initialTemp,
    +            Range<Double> maxTempRange, double deltaFactor) {
    +        this.currentTemp = initialTemp;
    +        this.maxTempRange = maxTempRange;
    +        this.deltaFactor = deltaFactor;
    +        Objects.requireNonNull(maxTempRange, "maxTempRange");
    +        if (!maxTempRange.contains(currentTemp))
    +            throw new IllegalArgumentException("currentTemp");
    --- End diff --
    
    The api argument is initialTemp.


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