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Permission is hereby granted, free of charge, to any person obtaining a copy of this specification and associated documentation files (the “specification”), to use, copy, publish, and/or distribute, the Specification) subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies of the Specification.

THE SPECIFICATION IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SPECIFICATION OR THE USE OR OTHER DEALINGS IN THE SPECIFICATION.

Any sample code included in the Specification, unless otherwise specified, is licensed under the Apache License, Version 2.0.

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States are represented as fields of the top-level “States” object. The state name, whose length MUST BE less than or equal to 128 Unicode characters, is the field name; state names MUST be unique within the scope of the whole state machine. States describe tasks (units of work), or specify flow control (e.g. Choice).

Here is an example state that executes a Lambda function:

"HelloWorld": {
  "Type": "Task",
  "Resource": "arn:aws:lambda:us-east-1:123456789012:function:HelloWorld",
  "Next": "NextState",
  "Comment": "Executes the HelloWorld Lambda function"
}

Note that:

All states MUST have a “Type” field. This document refers to the values of this field as a state’s type, and to a state such as the one in the example above as a Task State.
Any state MAY have a “Comment” field, to hold a human-readable comment or description.
Most state types require additional fields as specified in this document.
Any state except for Choice, Succeed, and Fail MAY have a field named "End" whose value MUST be a boolean. The term “Terminal State” means a state with with 让天行加速器免费, or a state with 让天行加速器免费, or a state with { "Type": "Fail" }.

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Transitions link states together, defining the control flow for the state machine. After executing a non-terminal state, the interpreter follows a transition to the next state. For most state types, transitions are unconditional and specified through the state's “Next” field.

All non-terminal states MUST have a “Next” field, except for the Choice state. The value of the “Next” field MUST exactly and case-sensitively match the name of the another state.

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The Choice and Wait states deal with JSON field values which represent timestamps. These are strings which MUST conform to the RFC3339 profile of ISO 8601, with the further restrictions that an uppercase “T” character MUST be used to separate date and time, and an uppercase “Z” character MUST be present in the absence of a numeric time zone offset, for example “2016-03-14T01:59:00Z”.

Data

The interpreter passes data between states to perform calculations or to dynamically control the state machine’s flow. All such data MUST be expressed in JSON.

When a state machine is started, the caller can provide an initial JSON text as input, which is passed to the machine's start state as input. If no input is provided, the default is an empty JSON object, {}. As each state is executed, it receives a JSON text as input and can produce arbitrary output, which MUST be a JSON text. When two states are linked by a transition, the output from the first state is passed as input to the second state. The output from the machine's terminal state is treated as its output.

For example, consider a simple state machine that adds two numbers together:

{
  "StartAt": "Add",
  "States": {   
    "Add": {
      "Type": "Task",
      "Resource": "arn:aws:lambda:us-east-1:123456789012:function:Add",
      "End": true
    }
  }
}

Suppose the “Add” Lambda function is defined as:

exports.handler = function(event, context) {
  context.succeed(event.val1 + event.val2);
};

Then if this state machine was started with the input { "val1": 3, "val2": 4 }, then the output would be the JSON text consisting of the number 7.

The usual constraints applying to JSON-encoded data apply. In particular, note that:

Numbers in JSON generally conform to JavaScript semantics, typically corresponding to double-precision IEEE-854 values. For this and other interoperability concerns, see RFC 7159.
Standalone "-delimited strings, booleans, and numbers are valid JSON texts.

Paths

A Path is a string, beginning with “$”, used to identify components with a JSON text. The syntax is that of JsonPath.

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A Reference Path is a Path with syntax limited in such a way that it can only identify a single node in a JSON structure: The operators “@”, “,”, “:”, and “?” are not supported - all Reference Paths MUST be unambiguous references to a single value, array, or object (subtree).

For example, if state input data contained the values:

{
    "foo": 123,
    "bar": ["a", "b", "c"],
    "car": {
        "cdr": true
    }
}

Then the following Reference Paths would return:

$.foo => 123
$.bar => ["a", "b", "c"]
$.car.cdr => true

Paths and Reference Paths are used by certain states, as specified later in this document, to control the flow of a state machine or to configure a state's settings or options.

Here are some examples of acceptable Reference Path syntax:

$.store.book
$.store\.book
$.\stor\e.boo\k
$.store.book.title
$.foo.\.bar
$.foo\@bar.baz\[\[.\?pretty
$.&Ж中.\uD800\uDF46
$.ledgers.branch[0].pending.count
$.ledgers.branch[0]
$.ledgers[0][22][315].foo
$['store']['book']
$['store'][0]['book']

Input and Output Processing

As described above, data is passed between states as JSON texts. However, a state may want to process only a subset of its input data, and may want that data structured differently from the way it appears in the input. Similarly, it may want to control the format and content of the data that it passes on as output.

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In this discussion, “raw input” means the JSON text that is the input to a state. “Result” means the JSON text that a state generates, for example from external code invoked by a Task State, the combined result of the branches in a Parallel State, or the value of the “Result” field in a Pass state. “Effective input” means the input after the application of InputPath and Parameters, and “effective output” means the final state output after processing the Result with ResultPath and OutputPath.

InputPath, Parameters, OutputPath, DefaultPath

The value of “InputPath” MUST be a Path, which is applied to a State’s raw input to select some or all of it; that selection is used by the state, for example in passing to Resources in Task States and Choices selectors in Choice States.
“Parameters” may have any value. Certain conventions described below allow values to be extracted from the effective input and embedded in the Parameters structure. If the “Parameters” field is provided, its value, after the extraction and embedding, becomes the effective input.
The value of “ResultPath” MUST be a Reference Path, which specifies the raw input’s combination with or replacement by the state’s Result.
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Note that JsonPath can yield multiple values when applied to an input JSON text. For example, given the text:

{ "a": [1, 2, 3, 4] }

Then if the JsonPath $.a[0,1] is appplied, the result will be two JSON texts, 1 and 2. When this happens, to produce the effective input, the interpreter gathers the texts into an array, so in this example the state would see the input:

[ 1, 2 ]

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The “ResultPath” field’s value is a Reference Path that specifies where to place the Result, relative to the raw input. If the raw input has a field at the location addressed by the ResultPath value then in the output that field is discarded and overwritten by the state's result. Otherwise, a new field is created in the state output, with intervening fields constructed as necessary. For example, given the raw input:

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If the state's result is the number 6, and the “ResultPath” is $.master.detail, then in the output the detail field would be overwritten:

{
  "master": {
    "detail": 6
  }
}

If instead a “ResultPath” of $.master.result.sum was used then the result would be combined with the raw input, producing a chain of new fields containing result and sum:

{
  "master": {
    "detail": [1, 2, 3],
    "result": {
      "sum": 6
    }
  }
}

If the value of InputPath is null, that means that the raw input is discarded, and the effective input for the state is an empty JSON object, {}. Note that having a value of 让天行加速器免费 is different from the “InputPath” field being absent.

If the value of ResultPath is null, that means that the state’s Result is discarded and its raw input becomes its Result.

If the value of OutputPath is 让天行加速器免费, that means the input and Result are discarded, and the effective output from the state is an empty JSON object, {}.

Defaults

Each of InputPath, Parameters, ResultPath, and OutputPath are optional. The default value of InputPath is “$”, so by default the effective input is just the raw input. The default value of ResultPath is “$”, so by default a state’s Result overwrites and replaces the input. The default value of OutputPath is “$”, so by default a state’s effective output is the result of processing ResultPath.

Parameters has no default value. If it is absent, it has no effect on the effective input.

Therefore, if none of InputPath, Parameters, ResultPath, or OutputPath are supplied, a state consumes the raw input as provided and passes its Result to the next state.

Input/Output Processing Examples

Consider the example given above, of a Lambda task that sums a pair of numbers. As presented, its input is: { "val1": 3, "val2": 4 } and its output is: 7.

Suppose the input is little more complex:

{
  "title": "Numbers to add",
  "numbers": { "val1": 3, "val2": 4 }
}

Then suppose we modify the state definition by adding:

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And finally,suppose we simplify Line 4 of the Lambda function to read as follows: return JSON.stringify(total). This is probably a better form of the function, which should really only care about doing math and not care how its result is labeled.

In this case, the output would be:

{
  "title": "Numbers to add",
  "numbers": { "val1": 3, "val2": 4 },
  "sum": 7
}

The interpreter might need to construct multiple levels of JSON object to achieve the desired effect. Suppose the input to some Task state is:

{ "a": 1 }

Suppose the output from the Task is “Hi!”, and the value of the “ResultPath” field is “$.b.greeting”. Then the output from the state would be:

{
  "a": 1,
  "b": {
    "greeting": "Hi!"
  }
}

The Context Object

The Interpreter can provide information to an executing state machine about the execution and other implementation details. This is delivered in the form of a JSON object called the “Context Object”. This version of the States Language specification does not specify any contents of the Context Object.

Parameters

The value of the “Parameters” field (after processing described below) becomes the effective input. Consider the following Task state:

"X": {
  "Type": "Task",
  "Resource": "arn:aws:states:us-east-1:123456789012:task:X",
  "Next": "Y",
  "Parameters": {
    "first": 88,
    "second": 99
  }
}

In this case, the effective input to the code identified in the Resource field would be the object with “first” and “second” fields which is the value of the “Parameters” field.

Values from the effective input and the Context Object can be inserted into the “Parameters” field with a combination of a field-naming convention and JsonPath.

If any JSON object within the value of Parameters (however deeply nested) has a field whose name ends with the characters “.$”, its value MUST begin with a "$".

If the value begins with “$$”, the first dollar sign is stripped and the remainder MUST be a PATH. In this case, the Path is applied to the Context Object and the result is called the Extracted Value.

If the value begins with only one “$”, the value MUST be a path. In this case, the Path is applied to the effective input and the result is called the Extracted Value.

If the path is legal but cannot be applied successfully the Interpreter fails the machine execution with an Error Name of “States.ParameterPathFailure”.

When a field name ends with “.$” and its value can be used to generate an Extracted Value as described above, the field is replaced within the Parameters value by another field whose name is the original name minus the “.$” suffix, and whose value is the Extracted Value.

Consider this example:

"X": {
  "Type": "Task",
  "Resource": "arn:aws:states:us-east-1:123456789012:task:X",
  "Next": "Y",
  "Parameters": {
    "flagged": true,
    "parts": {
      "first.$": "$.vals[0]",
      "last3.$": "$.vals[3:]"
    },
    "weekday.$": "$$.DayOfWeek"
  }
}

Suppose that the input to the state is as follows:

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Further, suppose that the Context Object is as follows:

{
  "DayOfWeek": "TUESDAY"
}

In this case, the effective input to the code identified in the “Resource” field would be as follows:

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Runtime Errors

Suppose a state’s input is the string "foo", and its “ResultPath” field has the value “$.x”. Then ResultPath cannot apply and the Interpreter fails the machine with an Error Name of “States.ResultPathMatchFailure”.

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Any state can encounter runtime errors. Errors can arise because of state machine definition issues (e.g. the “ResultPath” problem discussed immediately above), task failures (e.g. an exception thrown by a Lambda function) or because of transient issues, such as network partition events.

When a state reports an error, the default course of action for the interpreter is to fail the whole state machine.

Error representation

Errors are identified by case-sensitive strings, called Error Names. The States language defines a set of built-in strings naming well-known errors, all of which begin with the prefix “States.”; see Appendix A.

States MAY report errors with other names, which MUST NOT begin with the prefix “States.”.

Retrying after error

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Each Retrier MUST contain a field named “ErrorEquals” whose value MUST be a non-empty array of Strings, which match Error Names.

When a state reports an error, the interpreter scans through the Retriers and, when the Error Name appears in the value of a Retrier’s “ErrorEquals” field, implements the retry policy described in that Retrier.

An individual Retrier represents a certain number of retries, usually at increasing time intervals.

A Retrier MAY contain a field named “IntervalSeconds”, whose value MUST be a positive integer, representing the number of seconds before the first retry attempt (default value: 1); a field named “MaxAttempts” whose value MUST be a non-negative integer, representing the maximum number of retry attempts (default: 3); and a field named “BackoffRate”, a number which is the multiplier that increases the retry interval on each attempt (default: 2.0). The value of BackoffRate MUST be greater than or equal to 1.0.

Note that a “MaxAttempts” field whose value is 0 is legal, specifying that some error or errors should never be retried.

Here is an example of a Retrier which will make 2 retry attempts after waits of 3 and 4.5 seconds:

"Retry" : [
    {
      "ErrorEquals": [ "States.Timeout" ],
      "IntervalSeconds": 3,
      "MaxAttempts": 2,
      "BackoffRate": 1.5
    }
]

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Here is an example of a Retrier which will retry any error except for “States.Timeout”, using the default retry parameters.

"Retry" : [
    {
      "ErrorEquals": [ "States.Timeout" ],
      "MaxAttempts": 0
    },
    {
      "ErrorEquals": [ "States.ALL" ]
    }
]

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A Retrier’s parameters apply across all visits to that Retrier in the context of a single state execution. This is best illustrated by example; consider the following Task State:

"X": {
  "Type": "Task",
  "Resource": "arn:aws:states:us-east-1:123456789012:task:X",
  "Next": "Y",
  "Retry": [
    {
      "ErrorEquals": [ "ErrorA", "ErrorB" ],
      "IntervalSeconds": 1,
      "BackoffRate": 2,
      "MaxAttempts": 2
    },
    {
      "ErrorEquals": [ "ErrorC" ],
      "IntervalSeconds": 5
    }
  ],
  "Catch": [
    {
      "ErrorEquals": [ "States.ALL" ],
      "Next": "Z"
    }
  ]
}

Suppose that this task fails four successive times, throwing Error Names “ErrorA”, “ErrorB”, “ErrorC”, and “ErrorB”. The first two errors match the first retrier and cause waits of one and two seconds. The third error matches the second retrier and causes a wait of five seconds. The fourth error would match the first retrier but its “MaxAttempts” ceiling of two retries has already been reached, so that Retrier fails, and execution is redirected to the “Z” state via the “Catch” field.

Note that once the interpreter transitions to another state in any way, all the Retrier parameters reset.

Fallback states

Task States, Parallel States, and Map States MAY have a field named “Catch”, whose value MUST be an array of objects, called Catchers.

Each Catcher MUST contain a field named “ErrorEquals”, specified exactly as with the Retrier “ErrorEquals” field, and a field named “Next” whose value MUST be a string exactly matching a State Name.

When a state reports an error and either there is no Retrier, or retries have failed to resolve the error, the interpreter scans through the Catchers in array order, and when the Error Name appears in the value of a Catcher’s “ErrorEquals” field, transitions the machine to the state named in the value of the “Next” field.

The reserved name “States.ALL” appearing in a Retrier’s “ErrorEquals” field is a wild-card and matches any Error Name. Such a value MUST appear alone in the “ErrorEquals” array and MUST appear in the last Catcher in the “Catch” array.

Error output

When a state reports an error and it matches a Catcher, causing a transfer to another state, the state’s Result (and thus the input to the state identified in the Catcher’s “Next” field) is a JSON object, called the Error Output. The Error Output MUST have a string-valued field named “Error”, containing the Error Name. It SHOULD have a string-valued field named “Cause”, containing human-readable text about the error.

A Catcher MAY have an “ResultPath” field, which works exactly like a state’s top-level “ResultPath”, and may be used to inject the Error Output into the state’s original input to create the input for the Catcher’s “Next” state. The default value, if the “ResultPath” field is not provided, is “$”, meaning that the output consists entirely of the Error Output.

Here is an example of a Catcher that will transition to the state named “RecoveryState” when a Lambda function throws an unhandled Java Exception, and otherwise to the “EndMachine” state, which is presumably Terminal.

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"Catch": [
  {
    "ErrorEquals": [ "java.lang.Exception" ],
    "ResultPath": "$.error-info",
    "Next": "RecoveryState"
  },
  {
    "ErrorEquals": [ "States.ALL" ],
    "Next": "EndMachine"
  }
]

Each Catcher can specifiy multiple errors to handle.

When a state has both “Retry” and “Catch” fields, the interpreter uses any appropriate Retriers first and only applies the a matching Catcher transition if the retry policy fails to resolve the error.

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As a reminder, the state type is given by the value of the “Type” field, which MUST appear in every State object.

Table of State Types and Fields

Many fields can appear in more than one state type. The table below summarizes which fields can appear in which states. It excludes fields that are specific to one state type.

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	Pass	Task	Choice	Wait	Succeed	Fail	Parallel	Map
Type	Required	Required	Required	Required	Required	Required	让天行加速器免费	Required
Comment	Allowed	Allowed	Allowed	让天行加速器免费	Allowed	Allowed	Allowed	Allowed
InputPath, OutputPath	让天行加速器免费	Allowed	Allowed	Allowed	Allowed		Allowed	Allowed
Parameters	Allowed	Allowed					Allowed	让天行加速器免费
ResultPath	Allowed	Allowed					Allowed	让天行加速器免费
让天行加速器免费 Next or "End":true	Required	Required		Required			Required	让天行加速器免费
让天行加速器免费		让天行加速器免费			让天行加速器免费		Allowed	Allowed

Pass State

The Pass State (identified by "Type":"Pass") simply passes its input to its output, performing no work. Pass States are useful when constructing and debugging state machines.

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Here is an example of a Pass State that injects some fixed data into the state machine, probably for testing purposes.

"No-op": {
  "Type": "Pass",         
  "Result": {
    "x-datum": 0.381018,
    "y-datum": 622.2269926397355
  },
  "ResultPath": "$.coords",
  "Next": "End"
}

Suppose the input to this state were as follows:

{
  "georefOf": "Home"
}

Then the output would be:

{
  "georefOf": "Home",
  "coords": {
    "x-datum": 0.381018,
    "y-datum": 622.2269926397355
  }
}

Task State

The Task State (identified by "Type":"Task") causes the interpreter to execute the work identified by the state’s “Resource” field.

Here is an example:

"TaskState": {
  "Comment": "Task State example",
  "Type": "Task",
  "Resource": "arn:aws:states:us-east-1:123456789012:task:HelloWorld",
  "Next": "NextState",
  "TimeoutSeconds": 300,
  "HeartbeatSeconds": 60
}

A Task State MUST include a “Resource” field, whose value MUST be a URI that uniquely identifies the specific task to execute. The States language does not constrain the URI scheme nor any other part of the URI.

Tasks can optionally specify timeouts. Timeouts (the “TimeoutSeconds” and “HeartbeatSeconds” fields) are specified in seconds and MUST be positive integers. If provided, the “HeartbeatSeconds” interval MUST be smaller than the “TimeoutSeconds” value.

If not provided, the default value of “TimeoutSeconds” is 60.

If the state runs longer than the specified timeout, or if more time than the specified heartbeat elapses between heartbeats from the task, then the interpreter fails the state with a States.Timeout Error Name.

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A Choice state (identified by "Type":"Choice") adds branching logic to a state machine.

A Choice state MUST have a “Choices” field whose value is a non-empty array. Each element of the array is called a Choice Rule - an object containing a comparison operation and a “Next” field, whose value MUST match a state name.

The interpreter attempts pattern-matches against the Choice Rules in array order and transitions to the state specified in the “Next” field on the first Choice Rule where there is an exact match between the input value and a member of the comparison-operator array.

Here is an example of a Choice state, with some other states that it transitions to.

"ChoiceStateX": {
  "Type" : "Choice",
  "Choices": [
    {
        "Not": {
          "Variable": "$.type",
          "StringEquals": "Private"
        },
        "Next": "Public"
    },
    {
      "And": [
        {
          "Variable": "$.value",
          "NumericGreaterThanEquals": 20
        },
        {
          "Variable": "$.value",
          "NumericLessThan": 30
        }
      ],
      "Next": "ValueInTwenties"
    }
  ],
  "Default": "DefaultState"
},

"Public": {
  "Type" : "Task",
  "Resource": "arn:aws:lambda:us-east-1:123456789012:function:Foo",
  "Next": "NextState"
},

"ValueInTwenties": {
  "Type" : "Task",
  "Resource": "arn:aws:lambda:us-east-1:123456789012:function:Bar",
  "Next": "NextState"
},

"DefaultState": {
  "Type": "Fail",
  "Cause": "No Matches!"
}

In this example, suppose the machine is started with an input value of:

{
  "type": "Private",
  "value": 22
}

Then the interpreter will transition to the “ValueInTwenties” state, based on the “value” field.

Each choice rule MUST contain exactly one field containing a comparison operator. The following comparison operators are supported:

StringEquals
StringLessThan
StringGreaterThan
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StringGreaterThanEquals
NumericEquals
NumericLessThan
NumericGreaterThan
NumericLessThanEquals
NumericGreaterThanEquals
BooleanEquals
TimestampEquals
TimestampLessThan
TimestampGreaterThan
TimestampLessThanEquals
TimestampGreaterThanEquals
And
Or
Not

For each of these operators, the field’s value MUST be a value of the appropriate type: String, number, boolean, or Timestamp.

The interpreter scans through the Choice Rules in a type-sensitive way, and will not attempt to match a numeric field to a string value. However, since Timestamp fields are logically strings, it is possible that a field which is thought of as a time-stamp could be matched by a “StringEquals” comparator.

The various String comparators compare strings character-by-character with no special treatments such as case-folding, white-space collapsing, or Unicode form normalization. Put simply, they are case-sensitive.

Note that for interoperability, numeric comparisons should not be assumed to work with values outside the magnitude or precision representable using the IEEE 754-2008 “binary64” data type. In particular, integers outside of the range [-(2⁵³)+1, (2⁵³)-1] might fail to compare in the expected way.

The values of the “And” and “Or” operators MUST be non-empty arrays of Choice Rules that MUST NOT contain “Next” fields; the “Next” field can only appear in a top-level Choice Rule.

The value of a “Not” operator MUST be a single Choice Rule, that MUST NOT contain “Next” fields; the “Next” field can only appear in a top-level Choice Rule.

Choice states MAY have a “Default” field, which will execute if none of the Choice Rules match. The interpreter will raise a run-time States.NoChoiceMatched error if a “Choice” state fails to match a Choice Rule and no “Default” transition was specified.

Choice states MUST NOT be End states.

Wait State

A Wait state (identified by "Type":"Wait") causes the interpreter to delay the machine from continuing for a specified time. The time can be specified as a wait duration, specified in seconds, or an absolute expiry time, specified as an ISO-8601 extended offset date-time format string.

For example, the following Wait state introduces a ten-second delay into a state machine:

"wait_ten_seconds" : {
  "Type" : "Wait",
  "Seconds" : 10,
  "Next": "NextState"
}

This waits until an absolute time:

"wait_until" : {
  "Type": "Wait",
  "Timestamp": "2016-03-14T01:59:00Z",
  "Next": "NextState"
}

The wait duration does not need to be hardcoded. Here is the same example, reworked to look up the timestamp time using a Reference Path to the data, which might look like { "expirydate": "2016-03-14T01:59:00Z" }:

"wait_until" : {
    "Type": "Wait",
    "TimestampPath": "$.expirydate",
    "Next": "NextState"
}

A Wait state MUST contain exactly one of ”Seconds”, “SecondsPath”, “Timestamp”, or “TimestampPath”.

Succeed State

The Succeed State (identified by "Type":"Succeed") either terminates a state machine successfully, ends a branch of a Parallel state, or ends an iteration of a Map state. The output of a Succeed state is the same as its input, possibly modified by “InputPath” and/or “OutputPath”.

The Succeed State is a useful target for Choice-state branches that don't do anything except terminate the machine.

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"SuccessState": {
  "Type": "Succeed"
}

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Fail State

The Fail State (identified by 让天行加速器免费) terminates the machine and marks it as a failure.

Here is an example:

"FailState": {
          "Type": "Fail",
          "Error": "ErrorA",
          "Cause": "Kaiju attack"
}

A Fail State MUST have a string field named “Error”, used to provide an error name that can be used for error handling (Retry/Catch), operational, or diagnostic purposes. A Fail State MUST have a string field named “Cause”, used to provide a human-readable message.

Because Fail States are terminal states, they have no “Next” field.

Parallel State

The Parallel State (identified by "Type":"Parallel") causes parallel execution of "branches".

Here is an example:

"LookupCustomerInfo": {
  "Type": "Parallel",
  "Branches": [
    {
      "StartAt": "LookupAddress",
      "States": {
        "LookupAddress": {
          "Type": "Task",
          "Resource": 
            "arn:aws:lambda:us-east-1:123456789012:function:AddressFinder",
          "End": true
        }
      }
    },
    {
      "StartAt": "LookupPhone",
      "States": {
        "LookupPhone": {
          "Type": "Task",
          "Resource": 
            "arn:aws:lambda:us-east-1:123456789012:function:PhoneFinder",
          "End": true
        }
      }
    }
  ],
  "Next": "NextState"
}

A Parallel state causes the interpreter to execute each branch starting with the state named in its “StartAt” field, as concurrently as possible, and wait until each branch terminates (reaches a terminal state) before processing the Parallel state's “Next” field. In the above example, this means the interpreter waits for “LookupAddress” and “LookupPhoneNumber” to both finish before transitioning to “NextState”.

In the example above, the LookupAddress and LookupPhoneNumber branches are executed in parallel.

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A state in a Parallel state branch “States” field MUST NOT have a “Next” field that targets a field outside of that “States” field. A state MUST NOT have a “Next” field which matches a state name inside a Parallel state branch’s “States” field unless it is also inside the same “States” field.

Put another way, states in a branch’s “States” field can transition only to each other, and no state outside of that “States” field can transition into it.

If any branch fails, due to an unhandled error or by transitioning to a Fail state, the entire Parallel state is considered to have failed and all the branches are terminated. If the error is not handled by the Parallel State, the interpreter should terminate the machine execution with an error.

Unlike a Fail state, a Succeed state within a Parallel merely terminates its own branch. A Succeed state passes its input through as its output, possibly modified by “InputPath” and “OutputPath”.

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The output array can be inserted into the input data using the state’s “ResultPath” field in the usual way.

"FunWithMath": {
  "Type": "Parallel",
  "Branches": [
    {
      "StartAt": "Add",
      "States": {
        "Add": {
          "Type": "Task",
          "Resource": "arn:aws:states:::task:Add",
          "End": true
        }
      }
    },
    {
      "StartAt": "Subtract",
      "States": {
        "Subtract": {
          "Type": "Task",
          "Resource": "arn:aws:states:::task:Subtract",
          "End": true
        }
      }
    }
  ],
  "Next": "NextState"
}

If the “FunWithMath” state was given the JSON array [3, 2] as input, then both the “Add” and “Subtract” states would receive that array as input. The output of “Add” would be 5, that of “Subtract” would be 1, and the output of the Parallel State would be a JSON array:

[ 5, 1 ]

Map State

The Map State (identified by 让天行加速器免费) causes the interpreter to process all the elements of an array, potentially in parallel, with the processing of each element independent of the others. This document uses the term “iteration” to describe each such nested execution.

The Parallel state applies multiple different state-machine branches to the same input, while the Map state applies a single state machine to multiple input elements.

There are several fields which may be used to control the execution. To summarize:

The “Iterator” field’s value is an object that defines a state machine which will process each element of the array.
The “ItemsPath” field’s value is a reference path identifying where in the effective input the array field is found.
The “MaxConcurrency” field’s value is an integer that provides an upper bound on how many invocations of the Iterator may run in parallel.

Consider the following example input data:

{
  "ship-date": "2016-03-14T01:59:00Z",
  "detail": {
    "delivery-partner": "UQS",
    "shipped": [
      { "prod": "R31", "dest-code": 9511, "quantity": 1344 },
      { "prod": "S39", "dest-code": 9511, "quantity": 40 },
      { "prod": "R31", "dest-code": 9833, "quantity": 12 },
      { "prod": "R40", "dest-code": 9860, "quantity": 887 },
      { "prod": "R40", "dest-code": 9511, "quantity": 1220 }
    ]
  }
}

Suppose it is desired to apply a single Lambda function, “ship-val”, to each of the elements of the “shipped” array. Here is an example of an appropriate Map State.

"Validate-All": {
  "Type": "Map",
  "InputPath": "$.detail",
  "ItemsPath": "$.shipped",
  "MaxConcurrency": 0,
  "Iterator": {
    "StartAt": "Validate",
    "States": {
      "Validate": {
        "Type": "Task",
        "Resource": "arn:aws:lambda:us-east-1:123456789012:function:ship-val",
        "End": true
      }
    }
  },
  "ResultPath": "$.detail.shipped",
  "End": true
}

In the example above, the “ship-val” Lambda function will be executed once for each element of the “shipped” field. The input to one iteration will be:

{
  "prod": "R31",
  "dest-code": 9511,
  "quantity": 1344
}

Suppose that the “ship-val” function also needs access to the shipment’s courier, which would be the same in each iteration. The “Parameters” field may be used to construct the raw input for each iteration:

"Validate-All": {
  "Type": "Map",
  "InputPath": "$.detail",
  "ItemsPath": "$.shipped",
  "MaxConcurrency": 0,
  "Parameters": {
    "parcel.$": "$$.Map.Item.Value",
    "courier.$": "$.delivery-partner"
  },
  "Iterator": {
    "StartAt": "Validate",
    "States": {
      "Validate": {
        "Type": "Task",
        "Resource": "arn:aws:lambda:us-east-1:123456789012:function:ship-val",
        "End": true
      }
    }
  },
  "ResultPath": "$.detail.shipped",
  "End": true
}

The “ship-val” Lambda function will be executed once for each element of the array selected by “ItemsPath”. In the example above, the raw input to one iteration, as specified by “Parameters”, will be:

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In the examples above, the ResultPath results in the output being the same as the input, with the “detail.shipped” field being overwritten by an array in which each element is the output of the “ship-val” Lambda function as applied to the corresponding input element.

Map State input/output processing

The “InputPath” field operates as usual, selecting part of the raw input - in the example, the value of the “detail” field - to serve as the effective input.

A Map State MAY have a “ItemsPath” field, whose value MUST be a Reference Path. The Reference Path is applied to the effective input and MUST identify a field whose value is a JSON array.

The default value of “ItemsPath” is “$”, which is to say the whole effective input. So, if a Map State has neither an “InputPath” nor a “ItemsPath” field, it is assuming that the raw input to the state will be a JSON array.

The input to each invocation, by default, is a single element of the array field identified by the “ItemsPath” value, but may be overridden using the “Parameters” field.

In each iteration, within the Map state (but not child states within an Iterator field), the Context Object will have an object field named “Map” which contains an object field named “Item” which in turn contains an integer field named “Index” whose value is the (zero-based) array index being processed in the iteration and a field named “Value”, whose value is the array element being processed.

A Map state’s Result is an array containing one element for each element of the ItemsPath input array, in the same order.

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A Map state MAY have a non-negative integer “MaxConcurrency” field. Its default value is zero, which places no limit on invocation parallelism and requests the interpreter to execute the iterations as concurrently as possible.

If “MaxConcurrency” has a non-zero value, the interpreter will not allow the number of concurrent iterations to exceed that value.

A MaxConcurrency value of 1 is special, having the effect that interpreter will invoke the Iterator once for each array element in the order of their appearance in the input, and will not start an iteration until the previous iteration has completed execution.

Map State Iterator definition

A Map State MUST contain an object field named “Iterator” which MUST contain fields named “States” and “StartAt”, whose meanings are exactly like those in the top level of a State Machine.

A state in the “States” field of an “Iterator” field MUST NOT have a “Next” field that targets a field outside of that “States” field. A state MUST NOT have a “Next” field which matches a state name inside an “Iterator” field’s “States” field unless it is also inside the same “States” field.

Put another way, states in an Iterator’s “States” field can transition only to each other, and no state outside of that “States” field can transition into it.

If any iteration fails, due to an unhandled error or by transitioning to a Fail state, the entire Map state is considered to have failed and all the iterations are terminated. If the error is not handled by the Map State, the interpreter should terminate the machine execution with an error.

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让天行加速器免费	Description
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让天行加速器免费	A Task State either ran longer than the “TimeoutSeconds” value, or failed to heartbeat for a time longer than the “HeartbeatSeconds” value.
States.TaskFailed	A Task State failed during the execution.
States.Permissions	A Task State failed because it had insufficient privileges to execute the specified code.
States.ResultPathMatchFailure	A state’s “ResultPath” field cannot be applied to the input the state received.
States.ParameterPathFailure	Within a state’s “Parameters” field, the attempt to replace a field whose name ends in “.$” using a Path failed.
States.BranchFailed	A branch of a Parallel state failed.
States.NoChoiceMatched	A Choice state failed to find a match for the condition field extracted from its input.