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51 lines
2.0 KiB
51 lines
2.0 KiB
3 years ago
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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r"""
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A example workflow for task switch.
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This example will create four task in single workflow, with three shell task and one switch task. Task switch
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have one upstream which we declare explicit with syntax `parent >> switch`, and two downstream automatically
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set dependence by switch task by passing parameter `condition`. The graph of this workflow like:
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--> switch_child_1
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/
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parent -> switch ->
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\
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--> switch_child_2
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.
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"""
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from pydolphinscheduler.core.process_definition import ProcessDefinition
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from pydolphinscheduler.tasks.shell import Shell
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from pydolphinscheduler.tasks.switch import Branch, Default, Switch, SwitchCondition
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with ProcessDefinition(
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name="task_dependent_external",
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tenant="tenant_exists",
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) as pd:
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parent = Shell(name="parent", command="echo parent")
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switch_child_1 = Shell(name="switch_child_1", command="echo switch_child_1")
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switch_child_2 = Shell(name="switch_child_2", command="echo switch_child_2")
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switch_condition = SwitchCondition(
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Branch(condition="${var} > 1", task=switch_child_1),
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Default(task=switch_child_2),
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)
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switch = Switch(name="switch", condition=switch_condition)
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parent >> switch
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pd.submit()
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