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A fast dependency injector for Android and Java.
/*
* Copyright (C) 2014 The Dagger Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package dagger.internal.codegen.binding;
import static com.google.common.collect.Iterables.transform;
import static dagger.internal.codegen.extension.DaggerCollectors.toOptional;
import static dagger.internal.codegen.extension.DaggerStreams.instancesOf;
import static dagger.internal.codegen.extension.DaggerStreams.presentValues;
import static dagger.internal.codegen.extension.DaggerStreams.stream;
import static dagger.internal.codegen.extension.DaggerStreams.toImmutableList;
import static dagger.internal.codegen.extension.DaggerStreams.toImmutableMap;
import static dagger.internal.codegen.extension.DaggerStreams.toImmutableSet;
import androidx.room.compiler.processing.XExecutableElement;
import androidx.room.compiler.processing.XExecutableParameterElement;
import androidx.room.compiler.processing.XMethodElement;
import androidx.room.compiler.processing.XTypeElement;
import com.google.auto.value.AutoValue;
import com.google.auto.value.extension.memoized.Memoized;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSetMultimap;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimaps;
import com.google.common.collect.Sets;
import com.google.common.graph.ImmutableNetwork;
import com.google.common.graph.Traverser;
import dagger.internal.codegen.base.TarjanSCCs;
import dagger.internal.codegen.model.BindingGraph.ChildFactoryMethodEdge;
import dagger.internal.codegen.model.BindingGraph.ComponentNode;
import dagger.internal.codegen.model.BindingGraph.DependencyEdge;
import dagger.internal.codegen.model.BindingGraph.Edge;
import dagger.internal.codegen.model.BindingGraph.Node;
import dagger.internal.codegen.model.ComponentPath;
import dagger.internal.codegen.model.DaggerTypeElement;
import dagger.internal.codegen.model.DependencyRequest;
import dagger.internal.codegen.model.Key;
import java.util.Comparator;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Stream;
/**
* A graph that represents a single component or subcomponent within a fully validated top-level
* binding graph.
*/
@AutoValue
public abstract class BindingGraph {
/**
* A graph that represents the entire network of nodes from all components, subcomponents and
* their bindings.
*/
@AutoValue
public abstract static class TopLevelBindingGraph
extends dagger.internal.codegen.model.BindingGraph {
static TopLevelBindingGraph create(
ImmutableNetwork network, boolean isFullBindingGraph) {
TopLevelBindingGraph topLevelBindingGraph =
new AutoValue_BindingGraph_TopLevelBindingGraph(network, isFullBindingGraph);
ImmutableMap componentNodes =
topLevelBindingGraph.componentNodes().stream()
.collect(
toImmutableMap(ComponentNode::componentPath, componentNode -> componentNode));
ImmutableSetMultimap.Builder subcomponentNodesBuilder =
ImmutableSetMultimap.builder();
topLevelBindingGraph.componentNodes().stream()
.filter(componentNode -> !componentNode.componentPath().atRoot())
.forEach(
componentNode ->
subcomponentNodesBuilder.put(
componentNodes.get(componentNode.componentPath().parent()), componentNode));
// Set these fields directly on the instance rather than passing these in as input to the
// AutoValue to prevent exposing this data outside of the class.
topLevelBindingGraph.componentNodes = componentNodes;
topLevelBindingGraph.subcomponentNodes = subcomponentNodesBuilder.build();
topLevelBindingGraph.frameworkTypeBindings =
frameworkRequestBindingSet(network, topLevelBindingGraph.bindings());
return topLevelBindingGraph;
}
private ImmutableMap componentNodes;
private ImmutableSetMultimap subcomponentNodes;
private ImmutableSet frameworkTypeBindings;
TopLevelBindingGraph() {}
// This overrides dagger.internal.codegen.model.BindingGraph with a more efficient
// implementation.
@Override
public Optional componentNode(ComponentPath componentPath) {
return componentNodes.containsKey(componentPath)
? Optional.of(componentNodes.get(componentPath))
: Optional.empty();
}
/** Returns the set of subcomponent nodes of the given component node. */
ImmutableSet subcomponentNodes(ComponentNode componentNode) {
return subcomponentNodes.get(componentNode);
}
@Override
@Memoized
public ImmutableSetMultimap, ? extends Node> nodesByClass() {
return super.nodesByClass();
}
/**
* Returns an index of each {@link BindingNode} by its {@link ComponentPath}. Accessing this for
* a component and its parent components is faster than doing a graph traversal.
*/
@Memoized
ImmutableListMultimap bindingsByComponent() {
return Multimaps.index(transform(bindings(), BindingNode.class::cast), Node::componentPath);
}
/** Returns a {@link Comparator} in the same order as {@link Network#nodes()}. */
@Memoized
Comparator nodeOrder() {
Map nodeOrderMap = Maps.newHashMapWithExpectedSize(network().nodes().size());
int i = 0;
for (Node node : network().nodes()) {
nodeOrderMap.put(node, i++);
}
return (n1, n2) -> nodeOrderMap.get(n1).compareTo(nodeOrderMap.get(n2));
}
/** Returns the set of strongly connected nodes in this graph in reverse topological order. */
@Memoized
public ImmutableSet> stronglyConnectedNodes() {
return TarjanSCCs.compute(
ImmutableSet.copyOf(network().nodes()),
// NetworkBuilder does not have a stable successor order, so we have to roll our own
// based on the node order, which is stable.
// TODO(bcorso): Fix once https://github.com/google/guava/issues/2650 is fixed.
node ->
network().successors(node).stream().sorted(nodeOrder()).collect(toImmutableList()));
}
public boolean hasFrameworkRequest(Binding binding) {
return frameworkTypeBindings.contains(binding);
}
private static ImmutableSet frameworkRequestBindingSet(
ImmutableNetwork network,
ImmutableSet bindings) {
Set frameworkRequestBindings = new HashSet<>();
for (dagger.internal.codegen.model.Binding binding : bindings) {
ImmutableList edges =
network.inEdges(binding).stream()
.flatMap(instancesOf(DependencyEdge.class))
.collect(toImmutableList());
for (DependencyEdge edge : edges) {
DependencyRequest request = edge.dependencyRequest();
switch (request.kind()) {
case INSTANCE:
case FUTURE:
continue;
case PRODUCED:
case PRODUCER:
case MEMBERS_INJECTION:
case PROVIDER_OF_LAZY:
case LAZY:
case PROVIDER:
frameworkRequestBindings.add(((BindingNode) binding).delegate());
break;
}
}
}
return ImmutableSet.copyOf(frameworkRequestBindings);
}
}
static BindingGraph create(
ComponentNode componentNode, TopLevelBindingGraph topLevelBindingGraph) {
return create(Optional.empty(), componentNode, topLevelBindingGraph);
}
private static BindingGraph create(
Optional parent,
ComponentNode componentNode,
TopLevelBindingGraph topLevelBindingGraph) {
// TODO(bcorso): Mapping binding nodes by key is flawed since bindings that depend on local
// multibindings can have multiple nodes (one in each component). In this case, we choose the
// node in the child-most component since this is likely the node that users of this
// BindingGraph will want (and to remain consistent with LegacyBindingGraph). However, ideally
// we would avoid this ambiguity by getting dependencies directly from the top-level network.
// In particular, rather than using a Binding's list of DependencyRequests (which only
// contains the key) we would use the top-level network to find the DependencyEdges for a
// particular BindingNode.
Map contributionBindings = new LinkedHashMap<>();
Map membersInjectionBindings = new LinkedHashMap<>();
// Construct the maps of the ContributionBindings and MembersInjectionBindings by iterating
// bindings from this component and then from each successive parent. If a binding exists in
// multple components, this order ensures that the child-most binding is always chosen first.
Stream.iterate(componentNode.componentPath(), ComponentPath::parent)
// Stream.iterate is inifinte stream so we need limit it to the known size of the path.
.limit(componentNode.componentPath().components().size())
.flatMap(path -> topLevelBindingGraph.bindingsByComponent().get(path).stream())
.forEach(
bindingNode -> {
if (bindingNode.delegate() instanceof ContributionBinding) {
contributionBindings.putIfAbsent(bindingNode.key(), bindingNode);
} else if (bindingNode.delegate() instanceof MembersInjectionBinding) {
membersInjectionBindings.putIfAbsent(bindingNode.key(), bindingNode);
} else {
throw new AssertionError("Unexpected binding node type: " + bindingNode.delegate());
}
});
BindingGraph bindingGraph = new AutoValue_BindingGraph(componentNode, topLevelBindingGraph);
ImmutableSet modules =
((ComponentNodeImpl) componentNode).componentDescriptor().modules();
ImmutableSet inheritedModules =
parent.isPresent()
? Sets.union(parent.get().ownedModules, parent.get().inheritedModules).immutableCopy()
: ImmutableSet.of();
// Set these fields directly on the instance rather than passing these in as input to the
// AutoValue to prevent exposing this data outside of the class.
bindingGraph.inheritedModules = inheritedModules;
bindingGraph.ownedModules = Sets.difference(modules, inheritedModules).immutableCopy();
bindingGraph.contributionBindings = ImmutableMap.copyOf(contributionBindings);
bindingGraph.membersInjectionBindings = ImmutableMap.copyOf(membersInjectionBindings);
bindingGraph.bindingModules =
contributionBindings.values().stream()
.map(BindingNode::contributingModule)
.flatMap(presentValues())
.map(DaggerTypeElement::xprocessing)
.collect(toImmutableSet());
return bindingGraph;
}
private ImmutableMap contributionBindings;
private ImmutableMap membersInjectionBindings;
private ImmutableSet inheritedModules;
private ImmutableSet ownedModules;
private ImmutableSet bindingModules;
BindingGraph() {}
/** Returns the {@link ComponentNode} for this graph. */
public abstract ComponentNode componentNode();
/** Returns the {@link ComponentPath} for this graph. */
public final ComponentPath componentPath() {
return componentNode().componentPath();
}
/** Returns the {@link TopLevelBindingGraph} from which this graph is contained. */
public abstract TopLevelBindingGraph topLevelBindingGraph();
/** Returns the {@link ComponentDescriptor} for this graph */
public final ComponentDescriptor componentDescriptor() {
return ((ComponentNodeImpl) componentNode()).componentDescriptor();
}
/**
* Returns the {@link ContributionBinding} for the given {@link Key} in this component or {@link
* Optional#empty()} if one doesn't exist.
*/
public final Optional localContributionBinding(Key key) {
return contributionBindings.containsKey(key)
? Optional.of(contributionBindings.get(key))
.filter(bindingNode -> bindingNode.componentPath().equals(componentPath()))
.map(BindingNode::delegate)
: Optional.empty();
}
/**
* Returns the {@link MembersInjectionBinding} for the given {@link Key} in this component or
* {@link Optional#empty()} if one doesn't exist.
*/
public final Optional localMembersInjectionBinding(Key key) {
return membersInjectionBindings.containsKey(key)
? Optional.of(membersInjectionBindings.get(key))
.filter(bindingNode -> bindingNode.componentPath().equals(componentPath()))
.map(BindingNode::delegate)
: Optional.empty();
}
/** Returns the {@link ContributionBinding} for the given {@link Key}. */
public final ContributionBinding contributionBinding(Key key) {
return (ContributionBinding) contributionBindings.get(key).delegate();
}
/**
* Returns the {@link MembersInjectionBinding} for the given {@link Key} or {@link
* Optional#empty()} if one does not exist.
*/
public final Optional membersInjectionBinding(Key key) {
return membersInjectionBindings.containsKey(key)
? Optional.of((MembersInjectionBinding) membersInjectionBindings.get(key).delegate())
: Optional.empty();
}
/** Returns the {@link XTypeElement} for the component this graph represents. */
public final XTypeElement componentTypeElement() {
return componentPath().currentComponent().xprocessing();
}
/**
* Returns the set of modules that are owned by this graph regardless of whether or not any of
* their bindings are used in this graph. For graphs representing top-level {@link
* dagger.Component components}, this set will be the same as {@linkplain
* ComponentDescriptor#modules() the component's transitive modules}. For {@linkplain Subcomponent
* subcomponents}, this set will be the transitive modules that are not owned by any of their
* ancestors.
*/
public final ImmutableSet ownedModuleTypes() {
return ownedModules.stream()
.map(ModuleDescriptor::moduleElement)
.collect(toImmutableSet());
}
/**
* Returns the factory method for this subcomponent, if it exists.
*
* This factory method is the one defined in the parent component's interface.
*
*
In the example below, the {@link BindingGraph#factoryMethod} for {@code ChildComponent}
* would return the {@link XExecutableElement}: {@code childComponent(ChildModule1)} .
*
*
* {@literal @Component}
* interface ParentComponent {
* ChildComponent childComponent(ChildModule1 childModule);
* }
*
*/
// TODO(b/73294201): Consider returning the resolved ExecutableType for the factory method.
public final Optional factoryMethod() {
return topLevelBindingGraph().network().inEdges(componentNode()).stream()
.filter(edge -> edge instanceof ChildFactoryMethodEdge)
.map(edge -> ((ChildFactoryMethodEdge) edge).factoryMethod().xprocessing())
// Factory methods are represented by XMethodElement (rather than XConstructorElement)
// TODO(bcorso): consider adding DaggerMethodElement so this cast isn't needed.
.map(XMethodElement.class::cast)
.collect(toOptional());
}
/**
* Returns a map between the {@linkplain ComponentRequirement component requirement} and the
* corresponding {@link XExecutableParameterElement} for each module parameter in the {@linkplain
* BindingGraph#factoryMethod factory method}.
*/
// TODO(dpb): Consider disallowing modules if none of their bindings are used.
public final ImmutableMap
factoryMethodParameters() {
return factoryMethod().get().getParameters().stream()
.collect(
toImmutableMap(
parameter -> ComponentRequirement.forModule(parameter.getType()),
parameter -> parameter));
}
/**
* The types for which the component needs instances.
*
*
* - component dependencies
*
- owned modules with concrete instance bindings that are used in the graph
*
- bound instances
*
*/
@Memoized
public ImmutableSet componentRequirements() {
ImmutableSet requiredModules =
stream(Traverser.forTree(BindingGraph::subgraphs).depthFirstPostOrder(this))
.flatMap(graph -> graph.bindingModules.stream())
.filter(ownedModuleTypes()::contains)
.collect(toImmutableSet());
ImmutableSet.Builder requirements = ImmutableSet.builder();
componentDescriptor().requirements().stream()
.filter(
requirement ->
!requirement.kind().isModule()
|| requiredModules.contains(requirement.typeElement()))
.forEach(requirements::add);
if (factoryMethod().isPresent()) {
requirements.addAll(factoryMethodParameters().keySet());
}
return requirements.build();
}
/**
* Returns all {@link ComponentDescriptor}s in the {@link TopLevelBindingGraph} mapped by the
* component path.
*/
@Memoized
public ImmutableMap componentDescriptorsByPath() {
return topLevelBindingGraph().componentNodes().stream()
.map(ComponentNodeImpl.class::cast)
.collect(
toImmutableMap(ComponentNode::componentPath, ComponentNodeImpl::componentDescriptor));
}
@Memoized
public ImmutableList subgraphs() {
return topLevelBindingGraph().subcomponentNodes(componentNode()).stream()
.map(subcomponent -> create(Optional.of(this), subcomponent, topLevelBindingGraph()))
.collect(toImmutableList());
}
/** Returns the list of all {@link BindingNode}s local to this component. */
public ImmutableList localBindingNodes() {
return topLevelBindingGraph().bindingsByComponent().get(componentPath());
}
@Memoized
public ImmutableSet bindingNodes() {
return ImmutableSet.builder()
.addAll(contributionBindings.values())
.addAll(membersInjectionBindings.values())
.build();
}
}