gemfire-core/src/test/java/com/gemstone/gemfire/cache/hdfs/internal/SignalledFlushObserverJUnitTest.java

package com.gemstone.gemfire.cache.hdfs.internal;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

import org.junit.experimental.categories.Category;

import junit.framework.TestCase;

import com.gemstone.gemfire.cache.hdfs.internal.FlushObserver.AsyncFlushResult;
import com.gemstone.gemfire.cache.hdfs.internal.hoplog.AbstractHoplogOrganizer;
import com.gemstone.gemfire.test.junit.categories.HoplogTest;
import com.gemstone.gemfire.test.junit.categories.IntegrationTest
;

@Category({IntegrationTest.class, HoplogTest.class})
public class SignalledFlushObserverJUnitTest extends TestCase {
  private AtomicInteger events;
  private AtomicInteger delivered;
  
  private SignalledFlushObserver sfo;
  
  public void testEmpty() throws InterruptedException {
    assertFalse(sfo.shouldDrainImmediately());
    assertTrue(sfo.flush().waitForFlush(0, TimeUnit.NANOSECONDS));
    assertFalse(sfo.shouldDrainImmediately());
  }
  
  public void testSingle() throws InterruptedException {
    sfo.push();
    AsyncFlushResult result = sfo.flush();

    assertTrue(sfo.shouldDrainImmediately());
    sfo.pop(1);
    
    assertTrue(result.waitForFlush(0, TimeUnit.MILLISECONDS));
    assertFalse(sfo.shouldDrainImmediately());
  }

  public void testDouble() throws InterruptedException {
    sfo.push();
    sfo.push();

    AsyncFlushResult result = sfo.flush();
    assertTrue(sfo.shouldDrainImmediately());

    sfo.pop(1);
    assertFalse(result.waitForFlush(0, TimeUnit.MILLISECONDS));

    sfo.pop(1);
    assertTrue(result.waitForFlush(0, TimeUnit.MILLISECONDS));
    assertFalse(sfo.shouldDrainImmediately());
  }

  public void testTimeout() throws InterruptedException {
    sfo.push();
    AsyncFlushResult result = sfo.flush();

    assertTrue(sfo.shouldDrainImmediately());
    assertFalse(result.waitForFlush(100, TimeUnit.MILLISECONDS));
    sfo.pop(1);
    
    assertTrue(result.waitForFlush(0, TimeUnit.MILLISECONDS));
    assertFalse(sfo.shouldDrainImmediately());
  }
  
  @Override
  protected void setUp() {
    events = new AtomicInteger(0);
    delivered = new AtomicInteger(0);
    sfo = new SignalledFlushObserver();
    AbstractHoplogOrganizer.JUNIT_TEST_RUN = true;
  }
  
  private int push() {
    return events.incrementAndGet();
  }
  
  private int pop() {
    return delivered.incrementAndGet();
  }
}