core/src/test/java/io/grpc/internal/SerializeReentrantCallsDirectExecutorTest.java

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package io.grpc.internal;

import static java.util.Arrays.asList;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;

@RunWith(JUnit4.class)
public class SerializeReentrantCallsDirectExecutorTest {

  SerializeReentrantCallsDirectExecutor executor;

  @Before
  public void setup() {
    executor = new SerializeReentrantCallsDirectExecutor();
  }

  @Test public void reentrantCallsShouldBeSerialized() {
    final List<Integer> callOrder = new ArrayList<Integer>(4);
    executor.execute(new Runnable() {
      @Override
      public void run() {
        executor.execute(new Runnable() {
          @Override
          public void run() {
            executor.execute(new Runnable() {
              @Override public void run() {
                callOrder.add(3);
              }
            });

            callOrder.add(2);

            executor.execute(new Runnable() {
              @Override public void run() {
                callOrder.add(4);
              }
            });
          }
        });
        callOrder.add(1);
      }
    });

    assertEquals(asList(1, 2, 3, 4), callOrder);
  }

  @Test
  public void exceptionShouldNotCancelQueuedTasks() {
    final AtomicBoolean executed1 = new AtomicBoolean();
    final AtomicBoolean executed2 = new AtomicBoolean();
    executor.execute(new Runnable() {
      @Override
      public void run() {
        executor.execute(new Runnable() {
          @Override
          public void run() {
            executed1.set(true);
            throw new RuntimeException("Two");
          }
        });
        executor.execute(new Runnable() {
          @Override
          public void run() {
            executed2.set(true);
          }
        });

        throw new RuntimeException("One");
      }
    });

    assertTrue(executed1.get());
    assertTrue(executed2.get());
  }

  @Test(expected = NullPointerException.class)
  public void executingNullShouldFail() {
    executor.execute(null);
  }

  @Test
  public void executeCanBeRepeated() {
    final List<Integer> executes = new ArrayList<Integer>();
    executor.execute(new Runnable() {
      @Override
      public void run() {
        executes.add(1);
      }
    });
    executor.execute(new Runnable() {
      @Override
      public void run() {
        executes.add(2);
      }
    });

    assertEquals(asList(1,2), executes);
  }

  @Test
  public void interruptDoesNotAffectExecution() {
    final AtomicInteger callsExecuted = new AtomicInteger();

    Thread.currentThread().interrupt();

    executor.execute(new Runnable() {
      @Override
      public void run() {
        Thread.currentThread().interrupt();
        callsExecuted.incrementAndGet();
      }
    });

    executor.execute(new Runnable() {
      @Override
      public void run() {
        callsExecuted.incrementAndGet();
      }
    });

    // clear interrupted flag
    Thread.interrupted();
  }
}