| /* |
| * 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.drill.exec.testing; |
| |
| import com.fasterxml.jackson.annotation.JsonAutoDetect; |
| import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility; |
| import com.fasterxml.jackson.annotation.JsonCreator; |
| import com.fasterxml.jackson.annotation.JsonProperty; |
| |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationTargetException; |
| |
| /** |
| * Injection for a single exception. Specifies how many times to inject it, and how many times to skip |
| * injecting it before the first injection. This class is used internally for tracking injected |
| * exceptions; injected exceptions are specified via the |
| * {@link org.apache.drill.exec.ExecConstants#DRILLBIT_CONTROL_INJECTIONS} session option. |
| */ |
| @JsonAutoDetect(fieldVisibility = Visibility.ANY) |
| public class ExceptionInjection extends Injection { |
| |
| private final Class<? extends Throwable> exceptionClass; |
| |
| @JsonCreator // ensures instances are created only through JSON |
| private ExceptionInjection(@JsonProperty("address") final String address, |
| @JsonProperty("port") final int port, |
| @JsonProperty("siteClass") final String siteClass, |
| @JsonProperty("desc") final String desc, |
| @JsonProperty("nSkip") final int nSkip, |
| @JsonProperty("nFire") final int nFire, |
| @JsonProperty("exceptionClass") String classString) throws InjectionConfigurationException { |
| super(address, port, siteClass, desc, nSkip, nFire, 0L); |
| final Class<?> clazz; |
| try { |
| clazz = Class.forName(classString); |
| } catch (ClassNotFoundException e) { |
| throw new InjectionConfigurationException("Injected exceptionClass not found.", e); |
| } |
| |
| if (!Throwable.class.isAssignableFrom(clazz)) { |
| throw new InjectionConfigurationException("Injected exceptionClass is not a Throwable."); |
| } |
| |
| @SuppressWarnings("unchecked") |
| final Class<? extends Throwable> exceptionClazz = (Class<? extends Throwable>) clazz; |
| this.exceptionClass = exceptionClazz; |
| } |
| |
| /** |
| * Constructs the exception to throw, if it is time to throw it. |
| * |
| * @return the exception to throw, or null if it isn't time to throw it |
| */ |
| private Throwable constructException() { |
| if (! injectNow()) { |
| return null; |
| } |
| |
| // if we get here, we should throw the specified exception |
| final Constructor<?> constructor; |
| try { |
| constructor = exceptionClass.getConstructor(String.class); |
| } catch (NoSuchMethodException e) { |
| // this should not throw; validated already. |
| throw new RuntimeException("No constructor found that takes a single String argument."); |
| } |
| |
| final Throwable throwable; |
| try { |
| throwable = (Throwable) constructor.newInstance(getDesc()); |
| } catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) { |
| // this should not throw; validated already. |
| throw new IllegalStateException("Couldn't construct exception instance.", e); |
| } |
| |
| return throwable; |
| } |
| |
| /** |
| * Throw the unchecked exception specified by this injection. |
| * |
| * @throws IllegalStateException if it's time to throw, and the injection specified a checked exception |
| */ |
| public void throwUnchecked() { |
| final Throwable throwable = constructException(); |
| if (throwable == null) { |
| return; |
| } |
| |
| if (throwable instanceof RuntimeException) { |
| final RuntimeException e = (RuntimeException) throwable; |
| throw e; |
| } |
| if (throwable instanceof Error) { |
| final Error e = (Error) throwable; |
| throw e; |
| } |
| |
| throw new IllegalStateException("Throwable was not an unchecked exception."); |
| } |
| |
| /** |
| * Throw the checked exception specified by this injection. |
| * |
| * @param exceptionClass the class of the exception to throw |
| * @throws T if it is time to throw the exception |
| * @throws IllegalStateException if it is time to throw the exception, and the exception's class |
| * is incompatible with the class specified by the injection |
| */ |
| public <T extends Throwable> void throwChecked(final Class<T> exceptionClass) throws T { |
| final Throwable throwable = constructException(); |
| if (throwable == null) { |
| return; |
| } |
| |
| if (exceptionClass.isAssignableFrom(throwable.getClass())) { |
| final T exception = exceptionClass.cast(throwable); |
| throw exception; |
| } |
| |
| throw new IllegalStateException("Constructed Throwable(" + throwable.getClass().getName() |
| + ") is incompatible with exceptionClass(" + exceptionClass.getName() + ")"); |
| } |
| } |