mirror of https://github.com/apache/jclouds.git
Merge pull request #1206 from jclouds/stop-test-failure
unbreak cloudbees
This commit is contained in:
Adrian Cole
commit
6c39fd2407
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@ -29,40 +29,35 @@ import java.util.concurrent.atomic.AtomicReference;
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import org.jclouds.rest.AuthorizationException;
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import com.google.common.base.Objects;
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import com.google.common.base.Optional;
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import com.google.common.base.Supplier;
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import com.google.common.cache.CacheBuilder;
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import com.google.common.cache.CacheLoader;
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import com.google.common.cache.LoadingCache;
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import com.google.common.collect.ForwardingObject;
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import com.google.common.util.concurrent.UncheckedExecutionException;
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/**
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* This will retry the supplier if it encounters a timeout exception, but not if it encounters an
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* AuthorizationException.
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* <p/>
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* A shared exception reference is used so that anyone who encounters an authorizationexception will
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* be short-circuited. This prevents accounts from being locked out.
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* A shared exception reference is used so that anyone who encounters an authorizationexception will be short-circuited.
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* This prevents accounts from being locked out.
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*
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* <h3>details</h3>
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* http://code.google.com/p/google-guice/issues/detail?id=483 guice doesn't remember when singleton
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* providers throw exceptions. in this case, if the supplier fails with an authorization exception,
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* it is called again for each provider method that depends on it. To short-circuit this, we
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* remember the last exception trusting that guice is single-threaded.
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* http://code.google.com/p/google-guice/issues/detail?id=483 guice doesn't remember when singleton providers throw
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* exceptions. in this case, if the supplier fails with an authorization exception, it is called again for each provider
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* method that depends on it. To short-circuit this, we remember the last exception trusting that guice is
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* single-threaded.
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*
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* Note this implementation is folded into the same class, vs being decorated as stacktraces are
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* exceptionally long and difficult to grok otherwise. We use {@link LoadingCache} to deal with
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* concurrency issues related to the supplier.
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* Note this implementation is folded into the same class, vs being decorated as stacktraces are exceptionally long and
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* difficult to grok otherwise. We use {@link LoadingCache} to deal with concurrency issues related to the supplier.
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*
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* @author Adrian Cole
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*/
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public class MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier<T> extends ForwardingObject implements
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Supplier<T> {
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static class NullValueException extends RuntimeException {
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}
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static class SetAndThrowAuthorizationExceptionSupplierBackedLoader<V> extends CacheLoader<String, V> {
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static class SetAndThrowAuthorizationExceptionSupplierBackedLoader<V> extends CacheLoader<String, Optional<V>> {
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private final Supplier<V> delegate;
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private final AtomicReference<AuthorizationException> authException;
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@ -74,14 +69,11 @@ public class MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier<T> ext
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}
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@Override
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public V load(String key) {
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public Optional<V> load(String key) {
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if (authException.get() != null)
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throw authException.get();
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try {
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V value = delegate.get();
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if (value == null)
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throw new NullValueException();
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return value;
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return Optional.fromNullable(delegate.get());
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} catch (Exception e) {
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AuthorizationException aex = getFirstThrowableOfType(e, AuthorizationException.class);
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if (aex != null) {
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@ -102,7 +94,7 @@ public class MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier<T> ext
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private final Supplier<T> delegate;
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private final long duration;
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private final TimeUnit unit;
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private final LoadingCache<String, T> cache;
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private final LoadingCache<String, Optional<T>> cache;
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public static <T> MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier<T> create(
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AtomicReference<AuthorizationException> authException, Supplier<T> delegate, long duration, TimeUnit unit) {
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@ -127,14 +119,7 @@ public class MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier<T> ext
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@Override
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public T get() {
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try {
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T returnVal = cache.get("FOO");
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return returnVal;
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} catch (UncheckedExecutionException e) {
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NullValueException nullV = getFirstThrowableOfType(e, NullValueException.class);
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if (nullV != null) {
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return null;
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}
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throw propagate(e.getCause());
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return cache.get("FOO").orNull();
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} catch (ExecutionException e) {
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throw propagate(e.getCause());
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}
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@ -18,52 +18,38 @@
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*/
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package org.jclouds.rest.suppliers;
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import static com.google.common.base.Preconditions.checkNotNull;
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import static com.google.common.base.Suppliers.ofInstance;
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import static com.google.common.util.concurrent.Atomics.newReference;
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import static org.testng.Assert.assertEquals;
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import static org.testng.Assert.assertSame;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.TimeoutException;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.concurrent.atomic.AtomicReference;
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import org.jclouds.rest.AuthorizationException;
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import org.jclouds.rest.suppliers.MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier.SetAndThrowAuthorizationExceptionSupplierBackedLoader;
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import org.testng.annotations.Test;
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import com.google.common.base.Function;
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import com.google.common.base.Supplier;
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import com.google.common.base.Suppliers;
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import com.google.common.util.concurrent.Atomics;
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/**
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*
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* @author Adrian Cole
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*/
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@SuppressWarnings({ "unchecked", "rawtypes" })
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@Test(groups = "unit", testName = "MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplierTest")
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public class MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplierTest {
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@Test
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public void testLoaderNormal() {
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AtomicReference<AuthorizationException> authException = Atomics.newReference();
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assertEquals(new SetAndThrowAuthorizationExceptionSupplierBackedLoader<String>(Suppliers.ofInstance("foo"),
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authException).load("KEY"), "foo");
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AtomicReference<AuthorizationException> authException = newReference();
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assertEquals(new SetAndThrowAuthorizationExceptionSupplierBackedLoader<String>(ofInstance("foo"),
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authException).load("KEY").get(), "foo");
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assertEquals(authException.get(), null);
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}
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@Test(expectedExceptions = AuthorizationException.class)
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public void testLoaderThrowsAuthorizationExceptionAndAlsoSetsExceptionType() {
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AtomicReference<AuthorizationException> authException = Atomics.newReference();
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AtomicReference<AuthorizationException> authException = newReference();
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try {
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new SetAndThrowAuthorizationExceptionSupplierBackedLoader<String>(new Supplier<String>() {
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@Override
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public String get() {
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throw new AuthorizationException();
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}
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@ -75,11 +61,9 @@ public class MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplierTest {
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@Test(expectedExceptions = AuthorizationException.class)
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public void testLoaderThrowsAuthorizationExceptionAndAlsoSetsExceptionTypeWhenNested() {
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AtomicReference<AuthorizationException> authException = Atomics.newReference();
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AtomicReference<AuthorizationException> authException = newReference();
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try {
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new SetAndThrowAuthorizationExceptionSupplierBackedLoader<String>(new Supplier<String>() {
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@Override
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public String get() {
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throw new RuntimeException(new ExecutionException(new AuthorizationException()));
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}
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@ -91,11 +75,9 @@ public class MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplierTest {
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@Test(expectedExceptions = RuntimeException.class)
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public void testLoaderThrowsOriginalExceptionAndAlsoSetsExceptionTypeWhenNestedAndNotAuthorizationException() {
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AtomicReference<AuthorizationException> authException = Atomics.newReference();
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AtomicReference<AuthorizationException> authException = newReference();
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try {
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new SetAndThrowAuthorizationExceptionSupplierBackedLoader<String>(new Supplier<String>() {
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@Override
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public String get() {
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throw new RuntimeException(new IllegalArgumentException("foo"));
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}
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@ -104,163 +86,4 @@ public class MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplierTest {
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assertEquals(authException.get().getClass(), RuntimeException.class);
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}
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}
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@Test
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public void testMemoizeKeepsValueForFullDurationWhenDelegateCallIsSlow() {
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final long SLEEP_TIME = 250;
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final long EXPIRATION_TIME = 200;
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Supplier<Integer> slowSupplier = new CountingSupplier() {
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@Override
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public Integer get() {
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try {
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Thread.sleep(SLEEP_TIME);
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} catch (InterruptedException e) {
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Thread.currentThread().interrupt();
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}
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return super.get();
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}
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};
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Supplier<Integer> memoizedSupplier = new MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier(
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new AtomicReference<AuthorizationException>(), slowSupplier, EXPIRATION_TIME, TimeUnit.MILLISECONDS);
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assertEquals(memoizedSupplier.get(), (Integer) 10);
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assertEquals(memoizedSupplier.get(), (Integer) 10);
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}
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// =================================
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//
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// TODO Everything below this point is taken from SuppliersTest, to test our version of the
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// Suppliers2.memoizeWithExpiration
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// It should be deleted when we can switch back to using the google
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// Supplier.memoizeWithExpiration.
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private static class CountingSupplier implements Supplier<Integer> {
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transient int calls = 0;
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@Override
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public Integer get() {
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calls++;
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return calls * 10;
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}
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}
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@Test
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public void testMemoizeWithExpiration() throws InterruptedException {
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CountingSupplier countingSupplier = new CountingSupplier();
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Supplier<Integer> memoizedSupplier = new MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier(
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new AtomicReference<AuthorizationException>(), countingSupplier, 75, TimeUnit.MILLISECONDS);
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checkExpiration(countingSupplier, memoizedSupplier);
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}
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private void checkExpiration(CountingSupplier countingSupplier, Supplier<Integer> memoizedSupplier)
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throws InterruptedException {
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// the underlying supplier hasn't executed yet
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assertEquals(0, countingSupplier.calls);
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assertEquals(10, (int) memoizedSupplier.get());
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// now it has
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assertEquals(1, countingSupplier.calls);
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assertEquals(10, (int) memoizedSupplier.get());
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// it still should only have executed once due to memoization
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assertEquals(1, countingSupplier.calls);
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Thread.sleep(150);
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assertEquals(20, (int) memoizedSupplier.get());
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// old value expired
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assertEquals(2, countingSupplier.calls);
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assertEquals(20, (int) memoizedSupplier.get());
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// it still should only have executed twice due to memoization
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assertEquals(2, countingSupplier.calls);
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}
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@Test
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public void testExpiringMemoizedSupplierThreadSafe() throws Throwable {
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Function<Supplier<Boolean>, Supplier<Boolean>> memoizer = new Function<Supplier<Boolean>, Supplier<Boolean>>() {
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@Override
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public Supplier<Boolean> apply(Supplier<Boolean> supplier) {
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return new MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier(
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new AtomicReference<AuthorizationException>(), supplier, Long.MAX_VALUE, TimeUnit.NANOSECONDS);
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}
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};
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supplierThreadSafe(memoizer);
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}
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private void supplierThreadSafe(Function<Supplier<Boolean>, Supplier<Boolean>> memoizer) throws Throwable {
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final AtomicInteger count = new AtomicInteger(0);
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final AtomicReference<Throwable> thrown = Atomics.newReference(null);
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final int numThreads = 3;
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final Thread[] threads = new Thread[numThreads];
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final long timeout = TimeUnit.SECONDS.toNanos(60);
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final Supplier<Boolean> supplier = new Supplier<Boolean>() {
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boolean isWaiting(Thread thread) {
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switch (thread.getState()) {
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case BLOCKED:
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case WAITING:
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case TIMED_WAITING:
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return true;
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default:
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return false;
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}
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}
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int waitingThreads() {
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int waitingThreads = 0;
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for (Thread thread : threads) {
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if (isWaiting(thread)) {
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waitingThreads++;
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}
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}
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return waitingThreads;
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}
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@Override
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public Boolean get() {
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// Check that this method is called exactly once, by the first
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// thread to synchronize.
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long t0 = System.nanoTime();
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while (waitingThreads() != numThreads - 1) {
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if (System.nanoTime() - t0 > timeout) {
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thrown.set(new TimeoutException("timed out waiting for other threads to block"
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+ " synchronizing on supplier"));
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break;
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}
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Thread.yield();
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}
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count.getAndIncrement();
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return Boolean.TRUE;
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}
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};
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final Supplier<Boolean> memoizedSupplier = memoizer.apply(supplier);
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for (int i = 0; i < numThreads; i++) {
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threads[i] = new Thread() {
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@Override
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public void run() {
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assertSame(Boolean.TRUE, memoizedSupplier.get());
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}
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};
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}
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for (Thread t : threads) {
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t.start();
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}
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for (Thread t : threads) {
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t.join();
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}
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if (thrown.get() != null) {
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throw thrown.get();
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}
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assertEquals(1, count.get());
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}
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}
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