gradle-master/subprojects/composite-builds/src/main/java/org/gradle/composite/internal/DefaultNestedBuildTree.java
/*
 * Copyright 2021 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.composite.internal;

import org.gradle.api.artifacts.component.BuildIdentifier;
import org.gradle.api.internal.BuildDefinition;
import org.gradle.api.internal.StartParameterInternal;
import org.gradle.initialization.BuildCancellationToken;
import org.gradle.initialization.BuildRequestMetaData;
import org.gradle.initialization.DefaultBuildRequestMetaData;
import org.gradle.initialization.NoOpBuildEventConsumer;
import org.gradle.internal.build.BuildLayoutValidator;
import org.gradle.internal.build.BuildState;
import org.gradle.internal.buildtree.BuildTreeLifecycleController;
import org.gradle.internal.buildtree.BuildTreeModelControllerServices;
import org.gradle.internal.buildtree.BuildTreeState;
import org.gradle.internal.buildtree.NestedBuildTree;
import org.gradle.internal.classpath.ClassPath;
import org.gradle.internal.service.scopes.GradleUserHomeScopeServiceRegistry;
import org.gradle.internal.session.BuildSessionState;
import org.gradle.internal.session.CrossBuildSessionState;
import org.gradle.internal.time.Time;
import org.gradle.util.Path;

import java.util.function.Function;

public class DefaultNestedBuildTree implements NestedBuildTree {
    private final BuildDefinition buildDefinition;
    private final BuildIdentifier buildIdentifier;
    private final Path identityPath;
    private final BuildState owner;
    private final GradleUserHomeScopeServiceRegistry userHomeDirServiceRegistry;
    private final CrossBuildSessionState crossBuildSessionState;
    private final BuildCancellationToken buildCancellationToken;

    public DefaultNestedBuildTree(
        BuildDefinition buildDefinition,
        BuildIdentifier buildIdentifier,
        Path identityPath,
        BuildState owner,
        GradleUserHomeScopeServiceRegistry userHomeDirServiceRegistry,
        CrossBuildSessionState crossBuildSessionState,
        BuildCancellationToken buildCancellationToken
    ) {
        this.buildDefinition = buildDefinition;
        this.buildIdentifier = buildIdentifier;
        this.identityPath = identityPath;
        this.owner = owner;
        this.userHomeDirServiceRegistry = userHomeDirServiceRegistry;
        this.crossBuildSessionState = crossBuildSessionState;
        this.buildCancellationToken = buildCancellationToken;
    }

    @Override
    public <T> T run(Function<? super BuildTreeLifecycleController, T> buildAction) {
        StartParameterInternal startParameter = buildDefinition.getStartParameter();
        BuildRequestMetaData buildRequestMetaData = new DefaultBuildRequestMetaData(Time.currentTimeMillis());
        BuildSessionState session = new BuildSessionState(userHomeDirServiceRegistry, crossBuildSessionState, startParameter, buildRequestMetaData, ClassPath.EMPTY, buildCancellationToken, buildRequestMetaData.getClient(), new NoOpBuildEventConsumer());
        try {
            session.getServices().get(BuildLayoutValidator.class).validate(startParameter);
            BuildTreeModelControllerServices.Supplier modelServices = session.getServices().get(BuildTreeModelControllerServices.class).servicesForNestedBuildTree(startParameter);
            BuildTreeState buildTree = new BuildTreeState(session.getServices(), modelServices);
            try {
                RootOfNestedBuildTree rootBuild = new RootOfNestedBuildTree(buildDefinition, buildIdentifier, identityPath, owner, buildTree);
                rootBuild.attach();
                return rootBuild.run(buildAction);
            } finally {
                buildTree.close();
            }
        } finally {
            session.close();
        }
    }
}
