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/**

* 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;

/**

* A functional interface that has a {@code subscribe()} method that receives

* an instance of a {@link SingleEmitter} instance that allows pushing

* an event in a cancellation-safe manner.

*

* @param <T> the value type pushed

*/

public interface SingleOnSubscribe<T> {

/**

* Called for each SingleObserver that subscribes.

* @param e the safe emitter instance, never null

* @throws Exception on error

*/

void subscribe(SingleEmitter<T> e) throws Exception;

}