gradle-master/subprojects/messaging/src/main/java/org/gradle/internal/dispatch/Receive.java
/*
 * Copyright 2016 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.dispatch;

import javax.annotation.Nullable;

/**
 * A source for messages. Implementations do not have to be thread-safe.
 */
public interface Receive<T> {
    /**
     * Blocks until the next message is available. Returns null when the end of the message stream has been reached.
     *
     * @return The next message, or null when the end of the stream has been reached.
     */
    @Nullable
    T receive();
}
