48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
package managers
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import "fmt"
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// Prm groups the required parameters of the Builder's constructor.
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//
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// All values must comply with the requirements imposed on them.
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// Passing incorrect parameter values will result in constructor
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// failure (error or panic depending on the implementation).
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type Prm struct {
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// Manager builder for current node.
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//
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// Must not be nil.
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ManagerBuilder ManagerBuilder
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}
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// Builder represents component that routes node to its managers.
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//
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// For correct operation, Builder must be created using
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// the constructor (New) based on the required parameters
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// and optional components. After successful creation,
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// the Builder is immediately ready to work through API.
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type Builder struct {
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managerBuilder ManagerBuilder
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}
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const invalidPrmValFmt = "invalid parameter %s (%T):%v"
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func panicOnPrmValue(n string, v interface{}) {
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panic(fmt.Sprintf(invalidPrmValFmt, n, v, v))
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}
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// New creates a new instance of the Builder.
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//
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// Panics if at least one value of the parameters is invalid.
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//
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// The created Builder does not require additional
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// initialization and is completely ready for work.
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func New(prm Prm) *Builder {
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switch {
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case prm.ManagerBuilder == nil:
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panicOnPrmValue("ManagerBuilder", prm.ManagerBuilder)
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}
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return &Builder{
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managerBuilder: prm.ManagerBuilder,
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}
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}
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