/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.hadoop.yarn.server.utils;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.IOException;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import org.iq80.leveldb.DBException;
import org.iq80.leveldb.DBIterator;
import org.junit.Test;
public class TestLeveldbIterator {
private static class CallInfo {
String methodName;
Object[] args;
Class<?>[] argTypes;
public CallInfo(String methodName, Object... args) {
this.methodName = methodName;
this.args = args;
argTypes = new Class[args.length];
for (int i = 0; i < args.length; ++i) {
argTypes[i] = args[i].getClass();
}
}
}
// array of methods that should throw DBException instead of raw
// runtime exceptions
private static CallInfo[] RTEXC_METHODS = new CallInfo[] {
new CallInfo("seek", new byte[0]),
new CallInfo("seekToFirst"),
new CallInfo("seekToLast"),
new CallInfo("hasNext"),
new CallInfo("next"),
new CallInfo("peekNext"),
new CallInfo("hasPrev"),
new CallInfo("prev"),
new CallInfo("peekPrev"),
new CallInfo("remove")
};
@Test
public void testExceptionHandling() throws Exception {
InvocationHandler rtExcHandler = new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
throw new RuntimeException("forced runtime error");
}
};
DBIterator dbiter = (DBIterator) Proxy.newProxyInstance(
DBIterator.class.getClassLoader(), new Class[] { DBIterator.class },
rtExcHandler);
LeveldbIterator iter = new LeveldbIterator(dbiter);
for (CallInfo ci : RTEXC_METHODS) {
Method method = iter.getClass().getMethod(ci.methodName, ci.argTypes);
assertNotNull("unable to locate method " + ci.methodName, method);
try {
method.invoke(iter, ci.args);
fail("operation should have thrown");
} catch (InvocationTargetException ite) {
Throwable exc = ite.getTargetException();
assertTrue("Method " + ci.methodName + " threw non-DBException: "
+ exc, exc instanceof DBException);
assertFalse("Method " + ci.methodName + " double-wrapped DBException",
exc.getCause() instanceof DBException);
}
}
// check close() throws IOException
try {
iter.close();
fail("operation shoul have thrown");
} catch (IOException e) {
// expected
}
}
}