Copyright 2016 Netflix, Inc.
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 2016 Netflix, Inc.
 * 
 * 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 com.netflix.hystrix.metric;

import com.netflix.hystrix.HystrixInvokableInfo;
import rx.Observable;
import rx.subjects.PublishSubject;
import rx.subjects.Subject;

import java.util.Collection;

Stream of requests, each of which contains a series of command executions
/**
 * Stream of requests, each of which contains a series of command executions
 */
public class HystrixRequestEventsStream {
    private final Subject<HystrixRequestEvents, HystrixRequestEvents> writeOnlyRequestEventsSubject;
    private final Observable<HystrixRequestEvents> readOnlyRequestEvents;

    /* package */ HystrixRequestEventsStream() {
        writeOnlyRequestEventsSubject = PublishSubject.create();
        readOnlyRequestEvents = writeOnlyRequestEventsSubject.onBackpressureBuffer(1024);
    }

    private static final HystrixRequestEventsStream INSTANCE = new HystrixRequestEventsStream();

    public static HystrixRequestEventsStream getInstance() {
        return INSTANCE;
    }

    public void shutdown() {
        writeOnlyRequestEventsSubject.onCompleted();
    }

    public void write(Collection<HystrixInvokableInfo<?>> executions) {
        HystrixRequestEvents requestEvents = new HystrixRequestEvents(executions);
        writeOnlyRequestEventsSubject.onNext(requestEvents);
    }

    public Observable<HystrixRequestEvents> observe() {
        return readOnlyRequestEvents;
    }
}