| (window.webpackJsonp=window.webpackJsonp||[]).push([[66],{635:function(t,s,a){"use strict";a.r(s);var n=a(70),e=Object(n.a)({},(function(){var t=this,s=t.$createElement,a=t._self._c||s;return a("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[a("h1",{attrs:{id:"triggers"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#triggers"}},[t._v("#")]),t._v(" Triggers")]),t._v(" "),a("p",[t._v("The trigger provides a mechanism for listening to changes in time series data. With user-defined logic, tasks such as alerting, data cleaning, and data forwarding can be conducted.")]),t._v(" "),a("p",[t._v("The trigger is implemented based on the reflection mechanism. Users can monitor data changes by implementing the Java interfaces. 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"),a("code",[t._v("insertTablet")]),t._v(" interface or the "),a("code",[t._v("insertTablets")]),t._v(" interface of the Session API, you can reduce the overhead of trigger calls by implementing the above batch data insertion listening hooks.")]),t._v(" "),a("p",[t._v("It is recommended that the behaviors of the batch data insertion listening hooks and the single point insertion listening hooks be consistent. 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The states of the triggers will be default values after the system is restarted.")]),t._v(" "),a("li",[t._v("All hook calls of a trigger are serialized.")])]),t._v(" "),a("h2",{attrs:{id:"triggers-management"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#triggers-management"}},[t._v("#")]),t._v(" Triggers Management")]),t._v(" "),a("p",[t._v("You can register, drop, start or stop a trigger instance through SQL statements, and you can also query all registered triggers through SQL statements.")]),t._v(" "),a("h3",{attrs:{id:"trigger-states"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#trigger-states"}},[t._v("#")]),t._v(" Trigger States")]),t._v(" "),a("p",[t._v("Triggers have two states: "),a("code",[t._v("STARTED")]),t._v(" and "),a("code",[t._v("STOPPED")]),t._v(". You can start or stop a trigger by executing "),a("code",[t._v("START TRIGGER")]),t._v(" or "),a("code",[t._v("STOP TRIGGER")]),t._v(".")]),t._v(" "),a("p",[t._v("When the state of a trigger is "),a("code",[t._v("STOPPED")]),t._v(", it will not respond to the operations on the registered time series (such as inserting a data point), but all status (trigger variables), and registration information will be saved.")]),t._v(" "),a("p",[t._v("Note that the default state of the triggers registered by the "),a("code",[t._v("CREATE TRIGGER")]),t._v(" statement is "),a("code",[t._v("STARTED")]),t._v(".")]),t._v(" "),a("h3",{attrs:{id:"register-triggers"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#register-triggers"}},[t._v("#")]),t._v(" Register Triggers")]),t._v(" "),a("p",[t._v("A trigger can only be registered on an existing time series. Only one trigger can be registered for any time series.")]),t._v(" "),a("p",[t._v("The time series registered with the trigger will be listened to by the trigger. When there is a data change in the time series, the corresponding hook in the trigger will be called.")]),t._v(" "),a("p",[t._v("Registering a trigger can be carried out as follows:")]),t._v(" "),a("ol",[a("li",[a("p",[t._v("Implement a complete Trigger class. Assume that the full class name of this class is "),a("code",[t._v("org.apache.iotdb.db.engine.trigger.example.AlertListener")]),t._v(".")])]),t._v(" "),a("li",[a("p",[t._v("Pack the project into a JAR package. If you use Maven to manage the project, you can refer to the above Maven project example.")])]),t._v(" "),a("li",[a("p",[t._v("Put the JAR package in the directory "),a("code",[t._v("iotdb-server-0.13.0-SNAPSHOT/ext/trigger")]),t._v(" (or a subdirectory of "),a("code",[t._v("iotdb-server-0.13.0-SNAPSHOT/ext/trigger")]),t._v(").")]),t._v(" "),a("blockquote",[a("p",[t._v("You can specify the root path to load the trigger JAR packages by modifying the "),a("code",[t._v("trigger_root_dir")]),t._v(" in the configuration file.")])])]),t._v(" "),a("li",[a("p",[t._v("Use the SQL statement to register the trigger. Assume that the name given to the trigger is "),a("code",[t._v("alert-listener-sg1d1s1")]),t._v(".")]),t._v(" "),a("div",{staticClass:"language-sql line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-sql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("CREATE")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("TRIGGER")]),t._v(" alert"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("-")]),t._v("listener"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("-")]),t._v("sg1d1s1\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("AFTER")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("INSERT")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("ON")]),t._v(" root"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("sg1"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("d1"),a("span",{pre:!0,attrs:{class:"token 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"),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br"),a("span",{staticClass:"line-number"},[t._v("2")]),a("br"),a("span",{staticClass:"line-number"},[t._v("3")]),a("br"),a("span",{staticClass:"line-number"},[t._v("4")]),a("br"),a("span",{staticClass:"line-number"},[t._v("5")]),a("br"),a("span",{staticClass:"line-number"},[t._v("6")]),a("br"),a("span",{staticClass:"line-number"},[t._v("7")]),a("br"),a("span",{staticClass:"line-number"},[t._v("8")]),a("br")])])])]),t._v(" "),a("p",[t._v("The following shows the SQL syntax of registering a trigger.")]),t._v(" "),a("div",{staticClass:"language-sql line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-sql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("CREATE")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("TRIGGER")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token 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"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),t._v("CLASSNAME"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v("\n")])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br"),a("span",{staticClass:"line-number"},[t._v("2")]),a("br"),a("span",{staticClass:"line-number"},[t._v("3")]),a("br"),a("span",{staticClass:"line-number"},[t._v("4")]),a("br")])]),a("p",[t._v("You can also set any number of key-value pair attributes for the trigger through the "),a("code",[t._v("WITH")]),t._v(" clause:")]),t._v(" "),a("div",{staticClass:"language-sql line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-sql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("CREATE")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("TRIGGER")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token 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"),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br"),a("span",{staticClass:"line-number"},[t._v("2")]),a("br"),a("span",{staticClass:"line-number"},[t._v("3")]),a("br"),a("span",{staticClass:"line-number"},[t._v("4")]),a("br"),a("span",{staticClass:"line-number"},[t._v("5")]),a("br"),a("span",{staticClass:"line-number"},[t._v("6")]),a("br"),a("span",{staticClass:"line-number"},[t._v("7")]),a("br"),a("span",{staticClass:"line-number"},[t._v("8")]),a("br"),a("span",{staticClass:"line-number"},[t._v("9")]),a("br")])]),a("p",[a("code",[t._v("TRIGGER-NAME")]),t._v(" is a globally unique ID of the trigger, which is case sensitive.")]),t._v(" "),a("p",[t._v("At present, the trigger can listen to all data insertion operations on the time series. The hook can be called "),a("code",[t._v("BEFORE")]),t._v(" or "),a("code",[t._v("AFTER")]),t._v(" the data is inserted.")]),t._v(" "),a("p",[a("code",[t._v("FULL-PATH")]),t._v(" is the name of the time series that the trigger listens to. The path must be a measurement path.")]),t._v(" "),a("p",[a("code",[t._v("CLASSNAME")]),t._v(" is the full class name of the trigger.")]),t._v(" "),a("p",[t._v("Note that "),a("code",[t._v("CLASSNAME")]),t._v(", "),a("code",[t._v("KEY")]),t._v(" and "),a("code",[t._v("VALUE")]),t._v(" in the attributes need to be quoted in single or double quotes.")]),t._v(" "),a("h3",{attrs:{id:"drop-triggers"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#drop-triggers"}},[t._v("#")]),t._v(" Drop Triggers")]),t._v(" "),a("p",[t._v("Triggers will be dropped in the following scenarios:")]),t._v(" "),a("ol",[a("li",[t._v("When the user executes "),a("code",[t._v("DELETE TIMESERIES")]),t._v(", the triggers registered on the time series will be dropped.")]),t._v(" "),a("li",[t._v("When the user executes "),a("code",[t._v("DELETE STORAGE GROUP")]),t._v(", the triggers registered under the storage group will be dropped.")]),t._v(" "),a("li",[t._v("When the user executes the "),a("code",[t._v("DROP TRIGGER")]),t._v(" statement.")])]),t._v(" "),a("p",[t._v("The following shows the SQL syntax of dropping a trigger:")]),t._v(" "),a("div",{staticClass:"language-sql line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-sql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("DROP")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("TRIGGER")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("TRIGGER")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("-")]),t._v("NAME"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v("\n")])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br")])]),a("p",[t._v("The following is an example of a "),a("code",[t._v("DROP TRIGGER")]),t._v(" statement:")]),t._v(" "),a("div",{staticClass:"language-sql line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-sql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("DROP")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("TRIGGER")]),t._v(" alert"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("-")]),t._v("listener"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("-")]),t._v("sg1d1s1\n")])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br")])]),a("h3",{attrs:{id:"start-triggers"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#start-triggers"}},[t._v("#")]),t._v(" Start Triggers")]),t._v(" "),a("p",[t._v("This operation changes the state of the trigger from "),a("code",[t._v("STOPPED")]),t._v(" to "),a("code",[t._v("STARTED")]),t._v(", which will make the trigger re-listen to the operations on the registered time series and respond to data changes.")]),t._v(" "),a("p",[t._v("The following shows the SQL syntax of starting a trigger:")]),t._v(" "),a("div",{staticClass:"language-sql line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-sql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("START")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("TRIGGER")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("TRIGGER")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("-")]),t._v("NAME"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v("\n")])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br")])]),a("p",[t._v("The following is an example of a "),a("code",[t._v("START TRIGGER")]),t._v(" statement:")]),t._v(" "),a("div",{staticClass:"language-sql line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-sql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("START")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("TRIGGER")]),t._v(" alert"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("-")]),t._v("listener"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("-")]),t._v("sg1d1s1\n")])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br")])]),a("p",[t._v("Note that the triggers registered by the "),a("code",[t._v("CREATE TRIGGER")]),t._v(" statements are "),a("code",[t._v("STARTED")]),t._v(" by default.")]),t._v(" "),a("h3",{attrs:{id:"stop-triggers"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#stop-triggers"}},[t._v("#")]),t._v(" Stop Triggers")]),t._v(" "),a("p",[t._v("This operation changes the state of the trigger from "),a("code",[t._v("STARTED")]),t._v(" to "),a("code",[t._v("STOPPED")]),t._v(". When the status of a trigger is "),a("code",[t._v("STOPPED")]),t._v(", it will not respond to the operations on the registered time series (such as inserting a data point). You can restart a trigger using the "),a("code",[t._v("START TRIGGER")]),t._v(" statement.")]),t._v(" "),a("p",[t._v("The following shows the SQL syntax of stopping a trigger:")]),t._v(" "),a("div",{staticClass:"language-sql line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-sql"}},[a("code",[t._v("STOP "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("TRIGGER")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("TRIGGER")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("-")]),t._v("NAME"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v("\n")])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br")])]),a("p",[t._v("The following is an example of a "),a("code",[t._v("STOP TRIGGER")]),t._v(" statement:")]),t._v(" "),a("div",{staticClass:"language-sql line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-sql"}},[a("code",[t._v("STOP "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("TRIGGER")]),t._v(" alert"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("-")]),t._v("listener"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("-")]),t._v("sg1d1s1\n")])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br")])]),a("h3",{attrs:{id:"show-all-registered-triggers"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#show-all-registered-triggers"}},[t._v("#")]),t._v(" Show All Registered Triggers")]),t._v(" "),a("div",{staticClass:"language-sql line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-sql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("SHOW")]),t._v(" TRIGGERS\n")])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br")])]),a("h3",{attrs:{id:"user-authority-management"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#user-authority-management"}},[t._v("#")]),t._v(" User Authority Management")]),t._v(" "),a("p",[t._v("When a user manages triggers, 4 types of authorities will be involved:")]),t._v(" "),a("ul",[a("li",[a("code",[t._v("CREATE_TRIGGER")]),t._v(": Only users with this authority are allowed to register triggers.")]),t._v(" "),a("li",[a("code",[t._v("DROP_TRIGGER")]),t._v(": Only users with this authority are allowed to drop triggers.")]),t._v(" "),a("li",[a("code",[t._v("START_TRIGGER")]),t._v(": Only users with this authority are allowed to start triggers.")]),t._v(" "),a("li",[a("code",[t._v("STOP_TRIGGER")]),t._v(": Only users with this authority are allowed to stop triggers.")])]),t._v(" "),a("p",[t._v("For more information, refer to "),a("RouterLink",{attrs:{to:"/UserGuide/Master/Operation Manual/Administration.html"}},[t._v("Authority Management Statement")]),t._v(".")],1),t._v(" "),a("h2",{attrs:{id:"utilities"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#utilities"}},[t._v("#")]),t._v(" Utilities")]),t._v(" "),a("p",[t._v("Utility classes provide programming paradigms and execution frameworks for the common requirements, which can simplify part of your work of implementing triggers.")]),t._v(" "),a("h3",{attrs:{id:"windowing-utility"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#windowing-utility"}},[t._v("#")]),t._v(" Windowing Utility")]),t._v(" "),a("p",[t._v("The windowing utility can help you define sliding windows and the data processing logic on them. It can construct two types of sliding windows: one has a fixed time interval ("),a("code",[t._v("SlidingTimeWindowEvaluationHandler")]),t._v("), and the other has fixed number of data points ("),a("code",[t._v("SlidingSizeWindowEvaluationHandler")]),t._v(").")]),t._v(" "),a("p",[t._v("The windowing utility allows you to define a hook ("),a("code",[t._v("Evaluator")]),t._v(") on the window ("),a("code",[t._v("Window")]),t._v("). Whenever a new window is formed, the hook you defined will be called once. You can define any data processing-related logic in the hook. The call of the hook is asynchronous. Therefore, the current thread will not be blocked when the window processing logic is executed.")]),t._v(" "),a("p",[t._v("It is worth noting that whether it is "),a("code",[t._v("SlidingTimeWindowEvaluationHandler")]),t._v(" or "),a("code",[t._v("SlidingSizeWindowEvaluationHandler")]),t._v(", "),a("strong",[t._v("they can only handle sequences with strictly monotonically increasing timestamps")]),t._v(", and incoming data points that do not meet the requirements will be discarded.")]),t._v(" "),a("p",[t._v("For the definition of "),a("code",[t._v("Window")]),t._v(" and "),a("code",[t._v("Evaluator")]),t._v(", please refer to the "),a("code",[t._v("org.apache.iotdb.db.utils.windowing.api")]),t._v(" package.")]),t._v(" "),a("h4",{attrs:{id:"slidingsizewindowevaluationhandler"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#slidingsizewindowevaluationhandler"}},[t._v("#")]),t._v(" SlidingSizeWindowEvaluationHandler")]),t._v(" "),a("h5",{attrs:{id:"window-construction"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#window-construction"}},[t._v("#")]),t._v(" Window Construction")]),t._v(" "),a("p",[t._v("There are two construction methods.")]),t._v(" "),a("p",[t._v("The first method requires you to provide the type of data points that the window collects, the window size, the sliding step, and a hook ("),a("code",[t._v("Evaluator")]),t._v(").")]),t._v(" "),a("div",{staticClass:"language-java line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-java"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("final")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TSDataType")]),t._v(" dataType "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TSDataType")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("INT32"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("final")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("int")]),t._v(" windowSize "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token number"}},[t._v("10")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("final")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("int")]),t._v(" slidingStep "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token number"}},[t._v("5")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("SlidingSizeWindowEvaluationHandler")]),t._v(" handler "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("new")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("SlidingSizeWindowEvaluationHandler")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("new")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("SlidingSizeWindowConfiguration")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("dataType"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" windowSize"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" slidingStep"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n window "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("->")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// do something")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br"),a("span",{staticClass:"line-number"},[t._v("2")]),a("br"),a("span",{staticClass:"line-number"},[t._v("3")]),a("br"),a("span",{staticClass:"line-number"},[t._v("4")]),a("br"),a("span",{staticClass:"line-number"},[t._v("5")]),a("br"),a("span",{staticClass:"line-number"},[t._v("6")]),a("br"),a("span",{staticClass:"line-number"},[t._v("7")]),a("br"),a("span",{staticClass:"line-number"},[t._v("8")]),a("br"),a("span",{staticClass:"line-number"},[t._v("9")]),a("br"),a("span",{staticClass:"line-number"},[t._v("10")]),a("br")])]),a("p",[t._v("The second method requires you to provide the type of data points that the window collects, the window size, and a hook ("),a("code",[t._v("Evaluator")]),t._v("). The sliding step is equal to the window size by default.")]),t._v(" "),a("div",{staticClass:"language-java line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-java"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("final")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TSDataType")]),t._v(" dataType "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("TSDataType")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("INT32"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("final")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("int")]),t._v(" windowSize "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token number"}},[t._v("10")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("SlidingSizeWindowEvaluationHandler")]),t._v(" handler "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("new")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("SlidingSizeWindowEvaluationHandler")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("new")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("SlidingSizeWindowConfiguration")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("dataType"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" windowSize"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n window "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("->")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// do something")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br"),a("span",{staticClass:"line-number"},[t._v("2")]),a("br"),a("span",{staticClass:"line-number"},[t._v("3")]),a("br"),a("span",{staticClass:"line-number"},[t._v("4")]),a("br"),a("span",{staticClass:"line-number"},[t._v("5")]),a("br"),a("span",{staticClass:"line-number"},[t._v("6")]),a("br"),a("span",{staticClass:"line-number"},[t._v("7")]),a("br"),a("span",{staticClass:"line-number"},[t._v("8")]),a("br"),a("span",{staticClass:"line-number"},[t._v("9")]),a("br")])]),a("p",[t._v("The window size and the sliding step must be positive.")]),t._v(" "),a("h5",{attrs:{id:"datapoint-collection"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#datapoint-collection"}},[t._v("#")]),t._v(" Datapoint Collection")]),t._v(" "),a("div",{staticClass:"language-java line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-java"}},[a("code",[a("span",{pre:!0,attrs:{class:"token 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value"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br"),a("span",{staticClass:"line-number"},[t._v("2")]),a("br"),a("span",{staticClass:"line-number"},[t._v("3")]),a("br")])]),a("p",[t._v("Note that the type of the second parameter accepted by the "),a("code",[t._v("collect")]),t._v(" method needs to be consistent with the "),a("code",[t._v("dataType")]),t._v(" parameter provided during construction.")]),t._v(" "),a("p",[t._v("In addition, the "),a("code",[t._v("collect")]),t._v(" method will only respond to data points whose timestamps are monotonically increasing. 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Configurable Properties")]),t._v(" "),a("h5",{attrs:{id:"concurrent-window-evaluation-thread"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#concurrent-window-evaluation-thread"}},[t._v("#")]),t._v(" concurrent_window_evaluation_thread")]),t._v(" "),a("p",[t._v("The number of threads that can be used for evaluating sliding windows. 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Triggers can be dynamically registered and dropped without restarting the server.")])]),t._v(" "),a("li",[a("p",[t._v("It is best not to have classes with the same full class name but different function implementations in different JAR packages under "),a("code",[t._v("trigger_root_dir")]),t._v(". For example: the triggers "),a("code",[t._v("trigger1")]),t._v(" and "),a("code",[t._v("trigger2")]),t._v(" correspond to "),a("code",[t._v("trigger1.jar")]),t._v(" and "),a("code",[t._v("trigger2.jar")]),t._v(" respectively. If both JAR packages contain a "),a("code",[t._v("org.apache.iotdb.db.engine.trigger.example.AlertListener")]),t._v(" class, when this class is used by a "),a("code",[t._v("CREATE TRIGGER")]),t._v(" statement, the system will randomly load the class in one of the JAR packages, which may lead to inconsistent trigger behaviors and other problems.")])]),t._v(" "),a("li",[a("p",[t._v("Version management of trigger classes with the same full class name. Triggers with the same full class name but different versions (logic) are not allowed to register in the system.")]),t._v(" "),a("p",[t._v("Related question: IoTDB pre-registered 10 "),a("code",[t._v("org.apache.iotdb.db.engine.trigger.example.AlertListener")]),t._v(" trigger instances and DBA updated the implementation and corresponding JAR package of "),a("code",[t._v("org.apache.iotdb.db.engine.trigger.example.AlertListener")]),t._v(". Is it possible to drop only 5 of the instances and replace them with 5 updated trigger instances?")]),t._v(" "),a("p",[t._v("Answer: No. Only by dropping all the 10 pre-registered triggers can you register the updated triggers. If all the original triggers are not dropped, the newly registered triggers with the same full class name will behave in the same way as the existing triggers.")])])])])}),[],!1,null,null,null);s.default=e.exports}}]); |