client/src/main/resources/process-0.1.xsd

<?xml version="1.0" encoding="UTF-8"?>
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<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema"
           targetNamespace="uri:falcon:process:0.1" xmlns="uri:falcon:process:0.1"
           xmlns:jaxb="http://java.sun.com/xml/ns/jaxb" jaxb:version="2.1">
    <xs:annotation>
        <xs:documentation>
            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.
        </xs:documentation>
        <xs:appinfo>
            <jaxb:schemaBindings>
                <jaxb:package name="org.apache.falcon.entity.v0.process"/>
            </jaxb:schemaBindings>
        </xs:appinfo>
    </xs:annotation>

    <xs:element name="process" type="process">
        <xs:annotation>
            <xs:documentation>
                A process defines configuration for the workflow job like
                frequency of the workflow, inputs and outputs for the workflow, how to
                handle workflow failures, how to handle data that comes late and so on.
            </xs:documentation>
        </xs:annotation>
    </xs:element>
    <xs:complexType name="process">
        <xs:sequence>
            <xs:element type="KEY_VALUE_PAIR" name="tags" minOccurs="0">
                <xs:annotation>
                    <xs:documentation>
                        tags: a process specifies an optional list of comma separated tags,
                        Key Value Pairs, separated by comma,
                        which is used for classification of processes.
                        Example: consumer=consumer@xyz.com, owner=producer@xyz.com, department=forecasting
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element type="clusters" name="clusters">
                <xs:annotation>
                    <xs:documentation>Defines the clusters where the workflow should run
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="parallel">
                <xs:annotation>
                    <xs:documentation>Defines how many workflow instances can run concurrently
                    </xs:documentation>
                </xs:annotation>
                <xs:simpleType>
                    <xs:restriction base="xs:unsignedShort">
                        <xs:minInclusive value="1"/>
                        <xs:maxInclusive value="12"/>
                    </xs:restriction>
                </xs:simpleType>
            </xs:element>
            <xs:element type="execution-type" name="order">
                <xs:annotation>
                    <xs:documentation>Defines the order in which ready workflow instances should run
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element type="frequency-type" name="timeout" minOccurs="0">
                <xs:annotation>
                    <xs:documentation>Defines time after which instances will no longer be executed
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element type="frequency-type" name="frequency">
                <xs:annotation>
                    <xs:documentation>Defines workflow frequency
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="timezone" minOccurs="0" default="UTC">
                <xs:simpleType>
                    <xs:annotation>
                        <xs:appinfo>
                            <jaxb:javaType name="java.util.TimeZone" parseMethod="java.util.TimeZone.getTimeZone"
                                           printMethod="org.apache.falcon.entity.v0.SchemaHelper.getTimeZoneId"/>
                        </xs:appinfo>
                    </xs:annotation>
                    <xs:restriction base="xs:string"/>
                </xs:simpleType>
            </xs:element>
            <xs:element type="inputs" name="inputs" minOccurs="0">
                <xs:annotation>
                    <xs:documentation>Defines inputs for the workflow. The workflow will run only when the scheduled
                        time is up and all the inputs are available
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element type="outputs" name="outputs" minOccurs="0">
                <xs:annotation>
                    <xs:documentation>Defines outputs of the workflow
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element type="properties" name="properties" minOccurs="0">
            </xs:element>
            <xs:element type="workflow" name="workflow">
                <xs:annotation>
                    <xs:documentation>Defines the workflow that should run. The workflow should be defined with respect
                        to the workflow specification of the workflow engine.
                        Only
                        oozie workflow engine is supported as of now. The workflow path is the path on hdfs which
                        contains the workflow xml
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element type="retry" name="retry" minOccurs="0">
                <xs:annotation>
                    <xs:documentation>Retry defines how to handle workflow failures. Policy type - backoff, exponention
                        backoff along with the delay define how frequenctly
                        the
                        workflow should be re-tried. Number of attempts define how many times to re-try the failures.
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element type="late-process" name="late-process" minOccurs="0">
                <xs:annotation>
                    <xs:documentation>Late process defines how the late data should be handled. Late policy - backoff,
                        exponential backoff, final along with delay
                        define how
                        frequently Falcon should check for late data. The late data handling can be customized for each
                        input separatly.
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
        </xs:sequence>
        <xs:attribute type="IDENTIFIER" name="name" use="required"/>
    </xs:complexType>

    <xs:simpleType name="IDENTIFIER">
        <xs:restriction base="xs:string">
            <xs:pattern value="(([a-zA-Z]([\-a-zA-Z0-9])*){1,39})"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="clusters">
        <xs:annotation>
            <xs:documentation>
                A list of clusters.
            </xs:documentation>
        </xs:annotation>
        <xs:sequence>
            <xs:element type="cluster" name="cluster" maxOccurs="unbounded" minOccurs="1">
            </xs:element>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="cluster">
        <xs:annotation>
            <xs:documentation>
                Defines the cluster where the workflow should run. In addition, it also defines the validity of the
                workflow on this cluster
            </xs:documentation>
        </xs:annotation>
        <xs:sequence>
            <xs:element type="validity" name="validity"/>
        </xs:sequence>
        <xs:attribute type="IDENTIFIER" name="name" use="required"/>
    </xs:complexType>

    <xs:complexType name="validity">
        <xs:annotation>
            <xs:documentation>
                Defines the vailidity of the workflow as start and end time
            </xs:documentation>
        </xs:annotation>
        <xs:attribute type="date-time-type" name="start" use="required"/>
        <xs:attribute type="date-time-type" name="end" use="required"/>
    </xs:complexType>

    <xs:simpleType name="date-time-type">
        <xs:annotation>
            <xs:appinfo>
                <jaxb:javaType name="java.util.Date" parseMethod="org.apache.falcon.entity.v0.SchemaHelper.parseDateUTC"
                               printMethod="org.apache.falcon.entity.v0.SchemaHelper.formatDateUTC"/>
            </xs:appinfo>
        </xs:annotation>
        <xs:restriction base="xs:string">
            <xs:pattern
                    value="((1|2)\d\d\d[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])T([0-1][0-9]|2[0-3]):([0-5][0-9]))Z"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="execution-type">
        <xs:restriction base="xs:string">
            <xs:enumeration value="FIFO"/>
            <xs:enumeration value="LIFO"/>
            <xs:enumeration value="ONLYLAST"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="frequency-type">
        <xs:annotation>
            <xs:appinfo>
                <jaxb:javaType name="org.apache.falcon.entity.v0.Frequency"
                               parseMethod="org.apache.falcon.entity.v0.Frequency.fromString"
                               printMethod="org.apache.falcon.entity.v0.Frequency.toString"/>
            </xs:appinfo>
        </xs:annotation>
        <xs:restriction base="xs:string">
            <xs:pattern value="(minutes|hours|days|months)\([1-9]\d*\)"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="inputs">
        <xs:sequence>
            <xs:element type="input" name="input" maxOccurs="unbounded" minOccurs="0">
                <xs:annotation>
                    <xs:documentation>Defines input for the workflow. Each input maps to a feed. Input path and
                        frequency are picked from feed definition.
                        The input specifies the
                        start and end instance for the workflow. Falcon creates a property with input name which
                        contains paths of all input
                        instances between start and end. This
                        property will be available for the workflow to read inputs.
                        Input can also optionally specify the specific partition of feed that the workflow needs.
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="input">
        <xs:attribute type="IDENTIFIER" name="name" use="required"/>
        <xs:attribute type="IDENTIFIER" name="feed" use="required"/>
        <xs:attribute type="xs:string" name="start" use="required"/>
        <xs:attribute type="xs:string" name="end" use="required"/>
        <xs:attribute type="xs:string" name="partition" use="optional"/>
        <xs:attribute type="xs:boolean" name="optional" use="optional" default="false"/>
    </xs:complexType>

    <xs:complexType name="outputs">
        <xs:sequence>
            <xs:element type="output" name="output" maxOccurs="unbounded" minOccurs="0">
                <xs:annotation>
                    <xs:documentation>Each output maps to a feed. The Output path and frequency are picked from the
                        corresponding feed definition.
                        The output also specifies the
                        instance that is created in terms of EL expression.
                        For each output, Falcon creates a property with the output name which can be used in workflows
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="output">
        <xs:attribute type="IDENTIFIER" name="name" use="required"/>
        <xs:attribute type="IDENTIFIER" name="feed" use="required"/>
        <xs:attribute type="xs:string" name="instance" use="required"/>
    </xs:complexType>

    <xs:complexType name="workflow">
        <xs:attribute type="engine-type" name="engine" use="optional"/>
        <xs:attribute type="xs:string" name="path" use="required"/>
        <xs:attribute type="xs:string" name="lib" use="optional"/>
    </xs:complexType>

    <xs:simpleType name="engine-type">
        <xs:restriction base="xs:string">
            <xs:enumeration value="oozie"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="retry">
        <xs:attribute type="policy-type" name="policy" use="required"/>
        <xs:attribute type="frequency-type" name="delay" use="required"/>
        <xs:attribute name="attempts" use="required">
            <xs:simpleType>
                <xs:restriction base="xs:unsignedShort">
                    <xs:minInclusive value="1"/>
                </xs:restriction>
            </xs:simpleType>
        </xs:attribute>
    </xs:complexType>

    <xs:simpleType name="policy-type">
        <xs:restriction base="xs:string">
            <xs:enumeration value="periodic"/>
            <xs:enumeration value="exp-backoff"/>
            <xs:enumeration value="final"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="late-process">
        <xs:sequence>
            <xs:element type="late-input" name="late-input" maxOccurs="unbounded" minOccurs="1">
                <xs:annotation>
                    <xs:documentation>
                        For each input, defines the workflow that should be run when late data is detected
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
        </xs:sequence>
        <xs:attribute type="policy-type" name="policy" use="required"/>
        <xs:attribute type="frequency-type" name="delay" use="required"/>
    </xs:complexType>

    <xs:complexType name="late-input">
        <xs:attribute type="IDENTIFIER" name="input" use="required"/>
        <xs:attribute type="xs:string" name="workflow-path" use="required"/>
    </xs:complexType>

    <xs:complexType name="properties">
        <xs:sequence>
            <xs:element type="property" name="property" maxOccurs="unbounded" minOccurs="0"/>
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="property">
        <xs:attribute type="xs:string" name="name" use="required"/>
        <xs:attribute type="xs:string" name="value" use="required"/>
    </xs:complexType>

    <xs:simpleType name="KEY_VALUE_PAIR">
        <xs:restriction base="xs:string">
            <xs:pattern value="(\w+=[^,]+)?([,]?[ ]*[\w]+=[^,]+)*"/>
        </xs:restriction>
    </xs:simpleType>
</xs:schema>