https://github.com/ReactiveX/RxJava: Reactive Extensions for Java
  • David Karnok 
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.

/**
 * 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;

import io.reactivex.annotations.*;


Represents a basic Maybe source base interface, consumable via an MaybeObserver. 
 This class also serves the base type for custom operators wrapped into Maybe via Maybe.create(MaybeOnSubscribe<Object>). 
Type parameters:
  • <T> – the element type
Since:2.0
/**
 * Represents a basic {@link Maybe} source base interface,
 * consumable via an {@link MaybeObserver}.
 * <p>
 * This class also serves the base type for custom operators wrapped into
 * Maybe via {@link Maybe#create(MaybeOnSubscribe)}.
 *
 * @param <T> the element type
 * @since 2.0
 */
public interface MaybeSource<T> {

    
Subscribes the given MaybeObserver to this MaybeSource instance.

Params:
  • observer – the MaybeObserver, not null
Throws:
/**
     * Subscribes the given MaybeObserver to this MaybeSource instance.
     * @param observer the MaybeObserver, not null
     * @throws NullPointerException if {@code observer} is null
     */
    void subscribe(@NonNull MaybeObserver<? super T> observer);
}