ReplaySubjectExample.java

/*******************************************************************************
 * Copyright (c) 2015 Christos Froussios
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
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package itrx.chapter1;

import java.util.Arrays;
import java.util.concurrent.TimeUnit;

import org.junit.Test;

import rx.observers.TestSubscriber;
import rx.schedulers.Schedulers;
import rx.schedulers.TestScheduler;
import rx.subjects.ReplaySubject;

public class ReplaySubjectExample {
	
	public void exampleEarlyLate() {
		ReplaySubject<Integer> s = ReplaySubject.create();  
		s.subscribe(v -> System.out.println("Early:" + v));
		s.onNext(0);
		s.onNext(1);
		s.subscribe(v -> System.out.println("Late: " + v)); 
		s.onNext(2);
		
		// Early:0
		// Early:1
		// Late: 0
		// Late: 1
		// Early:2
		// Late: 2
	}
	
	public void exampleWithSize() {
		ReplaySubject<Integer> s = ReplaySubject.createWithSize(2); 
		s.onNext(0);
		s.onNext(1);
		s.onNext(2);
		s.subscribe(v -> System.out.println("Late: " + v)); 
		s.onNext(3);
		
		// Late: 1
		// Late: 2
		// Late: 3
	}
	
	public void exampleWithTime() throws InterruptedException {
		ReplaySubject<Integer> s = ReplaySubject.createWithTime(150, TimeUnit.MILLISECONDS, Schedulers.immediate());
		s.onNext(0);
		Thread.sleep(100);
		s.onNext(1);
		Thread.sleep(100);
		s.onNext(2);
		s.subscribe(v -> System.out.println("Late: " + v)); 
		s.onNext(3);
		
		// Late: 1
		// Late: 2
		// Late: 3
	}
	
	
	//
	// Test
	//
	
	@Test
	public void testEarlyLate() {
		TestSubscriber<Integer> tester = new TestSubscriber<Integer>();
		
		ReplaySubject<Integer> s = ReplaySubject.create();  
	    s.subscribe(tester);
	    s.onNext(0);
	    s.onNext(1);
	    s.subscribe(tester); 
	    s.onNext(2);
	    
	    tester.assertReceivedOnNext(Arrays.asList(0, 1, 0, 1, 2, 2));
	}
	
	@Test
	public void testWithSize() {
		TestSubscriber<Integer> tester = new TestSubscriber<Integer>();
		
		ReplaySubject<Integer> s = ReplaySubject.createWithSize(2); 
		s.onNext(0);
		s.onNext(1);
		s.onNext(2);
		s.subscribe(tester); 
		s.onNext(3);
		
		tester.assertReceivedOnNext(Arrays.asList(1,2,3));
	}
	
	@Test 
	public void testWithTime() {
		TestSubscriber<Integer> tester = new TestSubscriber<Integer>();
		TestScheduler scheduler = Schedulers.test();
		
		ReplaySubject<Integer> s = ReplaySubject.createWithTime(150, TimeUnit.MILLISECONDS, scheduler);
		s.onNext(0);
		scheduler.advanceTimeBy(100, TimeUnit.MILLISECONDS);
		s.onNext(1);
		scheduler.advanceTimeBy(100, TimeUnit.MILLISECONDS);
		s.onNext(2);
		s.subscribe(tester); 
		s.onNext(3);
		
		tester.assertReceivedOnNext(Arrays.asList(1,2,3));
	}
	

}