(window.webpackJsonp=window.webpackJsonp||[]).push([[377],{947:function(s,t,a){"use strict";a.r(t);var e=a(71),n=Object(e.a)({},(function(){var s=this,t=s.$createElement,a=s._self._c||t;return a("ContentSlotsDistributor",{attrs:{"slot-key":s.$parent.slotKey}},[a("h1",{attrs:{id:"usage"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#usage"}},[s._v("#")]),s._v(" Usage")]),s._v(" "),a("p",[s._v("Now, you are ready to start doing some awesome things with TsFile. This section demonstrates the detailed usages of TsFile.")]),s._v(" "),a("h2",{attrs:{id:"time-series-data"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#time-series-data"}},[s._v("#")]),s._v(" Time-series Data")]),s._v(" "),a("p",[s._v("A time-series is considered as a sequence of quadruples. A quadruple is defined as (device, measurement, time, value).")]),s._v(" "),a("ul",[a("li",[a("p",[a("strong",[s._v("measurement")]),s._v(": A physical or formal measurement that a time-series is taking, e.g., the temperature of a city, the\nsales number of some goods or the speed of a train at different times. As a traditional sensor (like a thermometer) also\ntakes a single measurement and produce a time-series, we will use measurement and sensor interchangeably below.")])]),s._v(" "),a("li",[a("p",[a("strong",[s._v("device")]),s._v(": A device refers to an entity that is taking several measurements (producing multiple time-series), e.g.,\na running train monitors its speed, oil meter, miles it has run, current passengers each is conveyed to a time-series.")])])]),s._v(" "),a("p",[s._v('Table 1 illustrates a set of time-series data. The set showed in the following table contains one device named "device_1"\nwith three measurements named "sensor_1", "sensor_2" and "sensor_3".')]),s._v(" "),a("center",[a("table",{staticStyle:{"text-align":"center"}},[a("tr",[a("th",{attrs:{colspan:"6"}},[s._v("device_1")])]),s._v(" "),a("tr",[a("th",{attrs:{colspan:"2"}},[s._v("sensor_1")]),a("th",{attrs:{colspan:"2"}},[s._v("sensor_2")]),a("th",{attrs:{colspan:"2"}},[s._v("sensor_3")])]),s._v(" "),a("tr",[a("th",[s._v("time")]),a("th",[s._v("value")]),a("th",[s._v("time")]),a("th",[s._v("value")]),a("th",[s._v("time")]),a("th",[s._v("value")])]),s._v(" "),a("tr",[a("td",[s._v("1")]),a("td",[s._v("1.2")]),a("td",[s._v("1")]),a("td",[s._v("20")]),a("td",[s._v("2")]),a("td",[s._v("50")])]),s._v(" "),a("tr",[a("td",[s._v("3")]),a("td",[s._v("1.4")]),a("td",[s._v("2")]),a("td",[s._v("20")]),a("td",[s._v("4")]),a("td",[s._v("51")])]),s._v(" "),a("tr",[a("td",[s._v("5")]),a("td",[s._v("1.1")]),a("td",[s._v("3")]),a("td",[s._v("21")]),a("td",[s._v("6")]),a("td",[s._v("52")])]),s._v(" "),a("tr",[a("td",[s._v("7")]),a("td",[s._v("1.8")]),a("td",[s._v("4")]),a("td",[s._v("20")]),a("td",[s._v("8")]),a("td",[s._v("53")])])]),s._v(" "),a("span",[s._v("A set of time-series data")])]),s._v(" "),a("p",[a("strong",[s._v("One Line of Data")]),s._v(": In many industrial applications, a device normally contains more than one sensor and these sensors\nmay have values at a same timestamp, which is called one line of data.")]),s._v(" "),a("p",[s._v("Formally, one line of data consists of a "),a("code",[s._v("device_id")]),s._v(", a timestamp which indicates the milliseconds since January 1,\n1970, 00:00:00, and several data pairs composed of "),a("code",[s._v("measurement_id")]),s._v(" and corresponding "),a("code",[s._v("value")]),s._v(". 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"),a("code",[s._v("TsFileOutput")]),s._v(" can be an instance of class "),a("code",[s._v("HDFSOutput")]),s._v(".")]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("public TsFileWriter(TsFileOutput output, FileSchema schema) throws IOException \n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br")])]),a("p",[a("strong",[s._v("Parameters:")])]),s._v(" "),a("ul",[a("li",[a("p",[s._v("file : The TsFile to write")])]),s._v(" "),a("li",[a("p",[s._v("schema : The file schemas, will be introduced in next part.")])])])]),s._v(" "),a("li",[a("p",[s._v("Second, add measurements")]),s._v(" "),a("p",[s._v("Or you can make an instance of class "),a("code",[s._v("FileSchema")]),s._v(" first and pass this to the constructor of class "),a("code",[s._v("TsFileWriter")])]),s._v(" "),a("p",[s._v("The class "),a("code",[s._v("FileSchema")]),s._v(" contains a map whose key is the name of one measurement schema, and the value is the schema itself.")]),s._v(" "),a("p",[s._v("Here are the interfaces:")]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("// Create an empty FileSchema or from an existing map\npublic FileSchema()\npublic FileSchema(Map<String, MeasurementSchema> measurements)\n\n// Use this two interfaces to add measurements\npublic void registerMeasurement(MeasurementSchema descriptor)\npublic void registerMeasurements(Map<String, MeasurementSchema> measurements)\n\n// Some useful getter and checker\npublic TSDataType getMeasurementDataType(String measurementId)\npublic MeasurementSchema getMeasurementSchema(String measurementId)\npublic Map<String, MeasurementSchema> getAllMeasurementSchema()\npublic boolean hasMeasurement(String measurementId)\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br"),a("span",{staticClass:"line-number"},[s._v("7")]),a("br"),a("span",{staticClass:"line-number"},[s._v("8")]),a("br"),a("span",{staticClass:"line-number"},[s._v("9")]),a("br"),a("span",{staticClass:"line-number"},[s._v("10")]),a("br"),a("span",{staticClass:"line-number"},[s._v("11")]),a("br"),a("span",{staticClass:"line-number"},[s._v("12")]),a("br"),a("span",{staticClass:"line-number"},[s._v("13")]),a("br")])]),a("p",[s._v("You can always use the following interface in "),a("code",[s._v("TsFileWriter")]),s._v(" class to add additional measurements:\n​")]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("public void addMeasurement(MeasurementSchema measurementSchema) throws WriteProcessException\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br")])]),a("p",[s._v("The class "),a("code",[s._v("MeasurementSchema")]),s._v(" contains the information of one measurement, there are several constructors:")]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("public MeasurementSchema(String measurementId, TSDataType type, TSEncoding encoding)\n\npublic MeasurementSchema(String measurementId, TSDataType type, TSEncoding encoding, CompressionType compressionType)\n\npublic MeasurementSchema(String measurementId, TSDataType type, TSEncoding encoding, CompressionType compressionType, \nMap<String, String> props)\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br")])]),a("p",[a("strong",[s._v("Parameters:")])]),s._v(" "),a("ul",[a("li",[a("p",[s._v("measurementID: The name of this measurement, typically the name of the sensor.")])]),s._v(" "),a("li",[a("p",[s._v("type: The data type, now support six types: "),a("code",[s._v("BOOLEAN")]),s._v(", "),a("code",[s._v("INT32")]),s._v(", "),a("code",[s._v("INT64")]),s._v(", "),a("code",[s._v("FLOAT")]),s._v(", "),a("code",[s._v("DOUBLE")]),s._v(", "),a("code",[s._v("TEXT")]),s._v(";")])]),s._v(" "),a("li",[a("p",[s._v("encoding: The data encoding. 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The set showed in the following table contains one deltaObject named "device_1" with three measurements named "sensor_1", "sensor_2" and "sensor_3". 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