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/*
* Copyright 2018 the original author or 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 org.gradle.api.internal.project;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import org.gradle.api.Project;
import org.gradle.api.artifacts.component.BuildIdentifier;
import org.gradle.api.artifacts.component.ProjectComponentIdentifier;
import org.gradle.initialization.DefaultProjectDescriptor;
import org.gradle.internal.Factories;
import org.gradle.internal.Factory;
import org.gradle.internal.Pair;
import org.gradle.internal.build.BuildState;
import org.gradle.internal.model.CalculatedModelValue;
import org.gradle.internal.model.ModelContainer;
import org.gradle.internal.resources.ProjectLeaseRegistry;
import org.gradle.internal.resources.ResourceLock;
import org.gradle.internal.work.WorkerLeaseService;
import org.gradle.util.Path;
import javax.annotation.Nullable;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.locks.ReentrantLock;
import java.util.function.Consumer;
import java.util.function.Function;
public class DefaultProjectStateRegistry implements ProjectStateRegistry {
private final WorkerLeaseService workerLeaseService;
private final Object lock = new Object();
private final Map projectsByPath = Maps.newLinkedHashMap();
private final Map projectsById = Maps.newLinkedHashMap();
private final Map, ProjectStateImpl> projectsByCompId = Maps.newLinkedHashMap();
private final AtomicReference ownerOfAllProjects = new AtomicReference<>();
public DefaultProjectStateRegistry(WorkerLeaseService workerLeaseService) {
this.workerLeaseService = workerLeaseService;
}
@Override
public void registerProjects(BuildState owner) {
Set allProjects = owner.getLoadedSettings().getProjectRegistry().getAllProjects();
synchronized (lock) {
for (DefaultProjectDescriptor descriptor : allProjects) {
addProject(owner, descriptor);
}
}
}
@Override
public void registerProject(BuildState owner, DefaultProjectDescriptor projectDescriptor) {
synchronized (lock) {
addProject(owner, projectDescriptor);
}
}
private void addProject(BuildState owner, DefaultProjectDescriptor descriptor) {
Path projectPath = descriptor.path();
Path identityPath = owner.getIdentityPathForProject(projectPath);
ProjectComponentIdentifier projectIdentifier = owner.getIdentifierForProject(projectPath);
ProjectStateImpl projectState = new ProjectStateImpl(owner, identityPath, projectPath, descriptor.getName(), projectIdentifier);
projectsByPath.put(identityPath, projectState);
projectsById.put(projectIdentifier, projectState);
projectsByCompId.put(Pair.of(owner.getBuildIdentifier(), projectPath), projectState);
}
@Override
public Collection getAllProjects() {
synchronized (lock) {
return projectsByPath.values();
}
}
// TODO - can kill this method, as the caller can use ProjectInternal.getMutationState() instead
@Override
public ProjectState stateFor(Project project) {
synchronized (lock) {
ProjectStateImpl projectState = projectsByPath.get(((ProjectInternal) project).getIdentityPath());
if (projectState == null) {
throw new IllegalArgumentException("Could not find state for " + project);
}
return projectState;
}
}
@Override
public ProjectState stateFor(ProjectComponentIdentifier identifier) {
synchronized (lock) {
ProjectStateImpl projectState = projectsById.get(identifier);
if (projectState == null) {
throw new IllegalArgumentException(identifier.getDisplayName() + " not found.");
}
return projectState;
}
}
@Override
public ProjectState stateFor(BuildIdentifier buildIdentifier, Path projectPath) {
synchronized (lock) {
ProjectStateImpl projectState = projectsByCompId.get(Pair.of(buildIdentifier, projectPath));
if (projectState == null) {
throw new IllegalArgumentException(buildIdentifier + " project " + projectPath + " not found.");
}
return projectState;
}
}
@Override
public void withMutableStateOfAllProjects(Runnable runnable) {
withMutableStateOfAllProjects(Factories.toFactory(runnable));
}
@Override
public T withMutableStateOfAllProjects(Factory factory) {
if (!ownerOfAllProjects.compareAndSet(null, Thread.currentThread())) {
// Already own all the projects
if (ownerOfAllProjects.get() == Thread.currentThread()) {
return factory.create();
}
throw new IllegalStateException(String.format("Another thread (%s) currently holds the state lock for all projects.", ownerOfAllProjects));
}
try {
return factory.create();
} finally {
ownerOfAllProjects.set(null);
}
}
@Override
public void blocking(Runnable runnable) {
Thread owner = ownerOfAllProjects.get();
if (owner == Thread.currentThread()) {
ownerOfAllProjects.set(null);
try {
runnable.run();
} finally {
ownerOfAllProjects.set(owner);
}
} else {
workerLeaseService.blocking(runnable);
}
}
@Override
public T allowUncontrolledAccessToAnyProject(Factory factory) {
return workerLeaseService.allowUncontrolledAccessToAnyProject(factory);
}
private class ProjectStateImpl implements ProjectState {
private final Path projectPath;
private final String projectName;
private final ProjectComponentIdentifier identifier;
private final BuildState owner;
private final Path identityPath;
private final ResourceLock projectLock;
private final Set canDoAnythingToThisProject = new CopyOnWriteArraySet<>();
private ProjectInternal project;
ProjectStateImpl(BuildState owner, Path identityPath, Path projectPath, String projectName, ProjectComponentIdentifier identifier) {
this.owner = owner;
this.identityPath = identityPath;
this.projectPath = projectPath;
this.projectName = projectName;
this.identifier = identifier;
this.projectLock = workerLeaseService.getProjectLock(owner.getIdentityPath(), identityPath);
}
@Override
public String toString() {
return identifier.getDisplayName();
}
@Override
public BuildState getOwner() {
return owner;
}
@Nullable
@Override
public ProjectState getParent() {
return identityPath.getParent() == null ? null : projectsByPath.get(identityPath.getParent());
}
@Override
public String getName() {
return projectName;
}
@Override
public Path getIdentityPath() {
return identityPath;
}
@Override
public Path getProjectPath() {
return projectPath;
}
@Override
public void attachMutableModel(ProjectInternal project) {
synchronized (this) {
if (this.project != null) {
throw new IllegalStateException(String.format("The project object for project %s has already been attached.", getIdentityPath()));
}
this.project = project;
}
}
@Override
public ProjectInternal getMutableModel() {
synchronized (this) {
if (project == null) {
throw new IllegalStateException(String.format("The project object for project %s has not been attached yet.", getIdentityPath()));
}
return project;
}
}
@Override
public ProjectComponentIdentifier getComponentIdentifier() {
return identifier;
}
@Override
public ResourceLock getAccessLock() {
return projectLock;
}
@Override
public void applyToMutableState(Consumer action) {
fromMutableState(p -> {
action.accept(p);
return null;
});
}
@Override
public S fromMutableState(Function function) {
Thread currentThread = Thread.currentThread();
if (workerLeaseService.isAllowedUncontrolledAccessToAnyProject() || canDoAnythingToThisProject.contains(currentThread)) {
// Current thread is allowed to access anything at any time, so run the function
return function.apply(getMutableModel());
}
Thread currentOwner = ownerOfAllProjects.get();
if (currentOwner != null) {
if (currentOwner == currentThread) {
// we hold the lock for all projects, can run the function
return function.apply(getMutableModel());
}
throw new IllegalStateException(String.format("Cannot acquire state lock for %s as another thread (%s) currently holds the state lock for all projects.", project, currentOwner));
}
Collection currentLocks = workerLeaseService.getCurrentProjectLocks();
if (currentLocks.contains(projectLock)) {
// if we already hold the project lock for this project
if (currentLocks.size() == 1) {
// the lock for this project is the only lock we hold, can run the function
return function.apply(getMutableModel());
} else {
currentLocks = Lists.newArrayList(currentLocks);
currentLocks.remove(projectLock);
// release any other project locks we might happen to hold
return workerLeaseService.withoutLocks(currentLocks, () -> function.apply(getMutableModel()));
}
} else {
// we don't currently hold the project lock
if (!currentLocks.isEmpty()) {
// we hold other project locks that we should release first
return workerLeaseService.withoutLocks(currentLocks, () -> withProjectLock(projectLock, function));
} else {
// we just need to get the lock for this project
return withProjectLock(projectLock, function);
}
}
}
@Override
public S forceAccessToMutableState(Function factory) {
Thread currentThread = Thread.currentThread();
boolean added = canDoAnythingToThisProject.add(currentThread);
try {
return factory.apply(getMutableModel());
} finally {
if (added) {
canDoAnythingToThisProject.remove(currentThread);
}
}
}
private S withProjectLock(ResourceLock projectLock, final Function function) {
return workerLeaseService.withLocks(Collections.singleton(projectLock), () -> function.apply(getMutableModel()));
}
@Override
public boolean hasMutableState() {
Thread currentThread = Thread.currentThread();
return canDoAnythingToThisProject.contains(currentThread) || workerLeaseService.isAllowedUncontrolledAccessToAnyProject() || ownerOfAllProjects.get() == currentThread || workerLeaseService.getCurrentProjectLocks().contains(projectLock);
}
@Override
public CalculatedModelValue newCalculatedValue(@Nullable T initialValue) {
return new CalculatedModelValueImpl<>(this, workerLeaseService, initialValue);
}
}
private static class CalculatedModelValueImpl implements CalculatedModelValue {
private final ProjectLeaseRegistry projectLeaseRegistry;
private final ModelContainer owner;
private final ReentrantLock lock = new ReentrantLock();
private volatile T value;
public CalculatedModelValueImpl(ProjectStateImpl owner, WorkerLeaseService projectLeaseRegistry, @Nullable T initialValue) {
this.projectLeaseRegistry = projectLeaseRegistry;
this.value = initialValue;
this.owner = owner;
}
@Override
public T get() throws IllegalStateException {
T currentValue = getOrNull();
if (currentValue == null) {
throw new IllegalStateException("No calculated value is available for " + owner);
}
return currentValue;
}
@Override
public T getOrNull() {
// Grab the current value, ignore updates that may be happening
return value;
}
@Override
public void set(T newValue) {
assertCanMutate();
value = newValue;
}
@Override
public T update(Function updateFunction) {
acquireUpdateLock();
try {
T newValue = updateFunction.apply(value);
value = newValue;
return newValue;
} finally {
releaseUpdateLock();
}
}
private void acquireUpdateLock() {
// It's important that we do not block waiting for the lock while holding the project mutation lock.
// Doing so can lead to deadlocks.
assertCanMutate();
if (lock.tryLock()) {
// Update lock was not contended, can keep holding the project locks
return;
}
// Another thread holds the update lock, release the project locks and wait for the other thread to finish the update
projectLeaseRegistry.withoutProjectLock(lock::lock);
}
private void assertCanMutate() {
if (!owner.hasMutableState()) {
throw new IllegalStateException("Current thread does not hold the state lock for " + owner);
}
}
private void releaseUpdateLock() {
lock.unlock();
}
}
}
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