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This version is still in development and is not considered stable yet. For the latest stable version, please use Spring Shell 3.4.0! |
Flow
When you use Flow Components to build something that involves
use of a multiple components, your implementation may become a bit cluttered.
To ease these use cases, we added a
ComponentFlow that can hook multiple component executions together
as a “flow”.
The following listings show examples of flows and their output in a shell:
static class FlowSampleComplex {
@Autowired
private ComponentFlow.Builder componentFlowBuilder;
public void runFlow() {
List<SelectItem> single1SelectItems = Arrays.asList(SelectItem.of("key1", "value1"),
SelectItem.of("key2", "value2"));
List<SelectItem> multi1SelectItems = Arrays.asList(SelectItem.of("key1", "value1"),
SelectItem.of("key2", "value2"), SelectItem.of("key3", "value3"));
ComponentFlow flow = componentFlowBuilder.clone().reset()
.withStringInput("field1")
.name("Field1")
.defaultValue("defaultField1Value")
.and()
.withStringInput("field2")
.name("Field2")
.and()
.withConfirmationInput("confirmation1")
.name("Confirmation1")
.and()
.withPathInput("path1")
.name("Path1")
.and()
.withSingleItemSelector("single1")
.name("Single1")
.selectItems(single1SelectItems)
.and()
.withMultiItemSelector("multi1")
.name("Multi1")
.selectItems(multi1SelectItems)
.and()
.build();
flow.run();
}
}Normal execution order of a components is same as defined with a builder. It’s
possible to conditionally choose where to jump in a flow by using a next
function and returning target component id. If this returned id is aither null
or doesn’t exist flow is essentially stopped right there.
static class FlowSampleConditional {
@Autowired
private ComponentFlow.Builder componentFlowBuilder;
public void runFlow() {
Map<String, String> single1SelectItems = new HashMap<>();
single1SelectItems.put("Field1", "field1");
single1SelectItems.put("Field2", "field2");
ComponentFlow flow = componentFlowBuilder.clone().reset()
.withSingleItemSelector("single1")
.name("Single1")
.selectItems(single1SelectItems)
.next(ctx -> ctx.getResultItem().get().getItem())
.and()
.withStringInput("field1")
.name("Field1")
.defaultValue("defaultField1Value")
.next(ctx -> null)
.and()
.withStringInput("field2")
.name("Field2")
.defaultValue("defaultField2Value")
.next(ctx -> null)
.and()
.build();
flow.run();
}
}
The result from running a flow returns ComponentFlowResult, which you can
use to do further actions.
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