Architektur-
entscheidungen
und ihre Folgen
The Good
The Bad
The Ugly
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Denis Brumann
Solutions Architect
Current Maintainer of Deptrac
denis.brumann@qossmic.com
@dbrumann
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Command Line
API Web App
What kind of application is Deptrac?
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Command Line
API Web App
What kind of application is Deptrac?
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Command Line
API Web App
Interactive
Non-Interactive
What kind of application is Deptrac?
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Web apps and APIs
https://my-app.com/
MyApp DB
MyApp
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https://foo.my-app.com/
Interactive runtime in web apps and APIs
https://acme.my-app.com/ ACME DB
Foo DB
MyApp
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https://foo.my-app.com/
Interactive runtime in web apps and APIs
https://acme.my-app.com/ ACME DB
Foo DB
MyApp
Tenant-Aware
Multi-Portal
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Warning Signs
Services creating other services
(usage of new in code)
Service Locator or factory-usage
Config-objects (or arrays) being passed through
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Possible Problems
Runtime errors (invalid context,
misconfigured services)
Debugging is more difficult
(which service/config was used?)
More coupling & complexity
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Lesson
Avoid creating/configuring services at runtime
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nikic/php-parser
is only used here
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nikic/php-parser
is only used here
Deptrac’s
own structure
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No longer contains
dependency-references
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Possible Benefits
Switching dependencies is easier
Refactoring is more contained
Easier extraction
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Possible Problems
Mapping between objects
can become annoying
More code/duplication
“Wrong” layers add complexity
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Lesson
Isolating layers helps contain changes
and makes switching out parts easier