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Merged
deer merged 1 commit into from
May 1, 2026
Merged

feat(spawn-application): uptake DI binding API improvements #26

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56 changes: 14 additions & 42 deletions spawn-application/src/main/java/build/spawn/application/AbstractTemplatedLauncher.java
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Original file line number Diff line number Diff line change
Expand Up @@ -23,7 +23,6 @@
import build.base.commandline.CommandLine;
import build.base.configuration.Configuration;
import build.base.configuration.ConfigurationBuilder;
import build.base.foundation.Introspection;
import build.base.logging.Logger;
import build.base.naming.UniqueNameGenerator;
import build.base.option.TemporaryDirectory;
Expand All @@ -34,7 +33,6 @@
import build.base.table.option.RowComparator;
import build.base.table.option.TableName;
import build.codemodel.foundation.usage.GenericTypeUsage;
import build.codemodel.foundation.usage.NamedTypeUsage;
import build.codemodel.injection.Binding;
import build.codemodel.injection.Context;
import build.codemodel.injection.Dependency;
Expand All @@ -52,6 +50,7 @@
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
Expand Down Expand Up @@ -243,68 +242,41 @@ public A launch(final P platform,

// allow the process interfaces to be used for injection
launchContext.bind((Class) process.getClass()).to(process);

Introspection.getAll(process.getClass(), Class::getInterfaces)
.filter(i -> !i.equals(Addressable.class))
.forEach(i -> launchContext.bind((Class) i).to(process));
launchContext.bind(process).asAllInterfaces(i -> !i.equals(Addressable.class));

// instantiate individual facets
final Set<Facet<?>> facets = launchOptions.stream(Facet.class)
.map(facet -> (Facet<?>) facet)
.map(facet -> {
final Object implementation = facet.getFactory().apply(launchContext);

// allow injection of facets
// allow injection of facets individually and as Iterable<T>
launchContext.bind((Class<Object>) facet.getInterface()).to(implementation);
launchContext.bindSet((Class<Object>) facet.getInterface()).add(implementation);

// create a synthetic Facet that always resolves to the same implementation
return Facet.of(facet.getInterface(), _ -> facet.getInterface().cast(implementation));
})
.collect(Collectors.toSet());

// allow Iterable<T> to be resolved for injection where T is implemented by zero or more Facets.
// fallback: return an empty Iterable<T> for any T not populated via bindSet above
launchContext.addResolver(new Resolver<Iterable<Object>>() {
@Override
public Optional<? extends Binding<Iterable<Object>>> resolve(final Dependency dependency) {

if (dependency.typeUsage() instanceof GenericTypeUsage genericTypeUsage
&& genericTypeUsage.typeName().canonicalName().equals(Iterable.class.getCanonicalName())
&& genericTypeUsage.parameters().count() == 1) {

final var parameterTypeUsage = genericTypeUsage.parameters()
.findFirst()
.orElseThrow();

if (parameterTypeUsage instanceof NamedTypeUsage namedTypeUsage) {
try {
final var parameterClass = this.getClass()
.getClassLoader()
.loadClass(namedTypeUsage.typeName().canonicalName());

// find the Facets that implement T
final var list = facets.stream()
.map(facet -> parameterClass.cast(facet.getFactory().apply(launchContext)))
.filter(parameterClass::isInstance)
.toList();

return Optional.of(new ValueBinding<Iterable<Object>>() {
@Override
@SuppressWarnings("unchecked")
public Iterable<Object> value() {
return (Iterable<Object>) list;
}

@Override
public Dependency dependency() {
return dependency;
}
});
return Optional.of(new ValueBinding<Iterable<Object>>() {
@Override
public Iterable<Object> value() {
return List.of();
}
catch (final ClassNotFoundException e) {
LOGGER.debug("Could not load class [{0}] for Iterable injection resolution",
namedTypeUsage.typeName().canonicalName(), e);

@Override
public Dependency dependency() {
return dependency;
}
}
});
}

return Optional.empty();
Expand Down
4 changes: 1 addition & 3 deletions spawn-application/src/main/java/build/spawn/application/AbstractTemplatedPlatform.java
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Original file line number Diff line number Diff line change
Expand Up @@ -172,7 +172,6 @@ public Configuration configuration() {
}

@Override
@SuppressWarnings({"unchecked", "rawtypes"})
public Context createContext(final Class<? extends Application> applicationClass,
final Configuration configuration) {

Expand All @@ -189,8 +188,7 @@ public Context createContext(final Class<? extends Application> applicationClass
context.bind(InjectionFramework.class).to(this.injectionFramework);

// allow all interfaces of the Platform to be injected
Introspection.getAll(getClass(), Class::getInterfaces)
.forEach(i -> context.bind((Class) i).to(this));
context.bind(this).asAllInterfaces();

// allows the Platform Server to be injected
context.bind(Server.class).to(this.server);
Expand Down
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