gradle-master/subprojects/core/src/main/java/org/gradle/internal/session/BuildSessionLifecycleListener.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.internal.session;

import org.gradle.internal.service.scopes.EventScope;
import org.gradle.internal.service.scopes.Scopes;

/**
 * A listener that is notified when a session is started and completed. No more than one session may be active at any time.
 *
 * One or more builds may be run during a session. For example, when running in continuous mode, multiple builds are run during a single session.
 */
@EventScope(Scopes.BuildSession.class)
public interface BuildSessionLifecycleListener {
    /**
     * Called at the start of the session, immediately after initializing the session services.
     *
     * This method is called before the root build operation has started, so implementations should not perform any expensive work
     * and should not run any user code.
     */
    default void afterStart() {
    }

    /**
     * Called at the completion of the session, immediately prior to tearing down the session services.
     *
     * This method is called after the root build operation has completed, so implementations should not perform any expensive work
     * and should not run any user code.
     */
    default void beforeComplete() {
    }
}
