/**
 * Copyright (c) 2016-present, RxJava Contributors.
 *
 * 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 io.reactivex;

/**
 * Base interface for emitting signals in a push-fashion in various generator-like source
 * operators (create, generate).
 *
 * @param <T> the value type emitted
 */
public interface Emitter<T> {

    /**
     * Signal a normal value.
     * @param value the value to signal, not null
     */
    void onNext(T value);

    /**
     * Signal a Throwable exception.
     * @param error the Throwable to signal, not null
     */
    void onError(Throwable error);

    /**
     * Signal a completion.
     */
    void onComplete();
}

@@ -621,16 +621,58 @@
 tivex;%0A%0A
+import io.reactivex.annotations.NonNull;%0A%0A
 /**%0A * B
@@ -977,16 +977,25 @@
  onNext(
+@NonNull 
 T value)
@@ -1121,16 +1121,25 @@
 onError(
+@NonNull 
 Throwabl

Add @NonNull to the methods of Emitter (#5156)