/**
* 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.camel.component.file;
import java.io.File;
import java.io.IOException;
import org.apache.camel.ContextTestSupport;
import org.apache.camel.Exchange;
import org.apache.camel.LoggingLevel;
import org.apache.camel.Processor;
import org.apache.camel.ProducerTemplate;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.impl.JndiRegistry;
import org.apache.camel.spi.ExceptionHandler;
/**
*
*/
public class FileConsumerCustomExceptionHandlerTest extends ContextTestSupport {
private MyReadLockStrategy myReadLockStrategy = new MyReadLockStrategy();
private MyExceptionHandler myExceptionHandler = new MyExceptionHandler();
public void testCustomExceptionHandler() throws Exception {
myExceptionHandler.setTemplate(context.createProducerTemplate());
getMockEndpoint("mock:result").expectedMessageCount(2);
getMockEndpoint("mock:error").expectedBodiesReceived("Error Forced to simulate no space on device");
template.sendBodyAndHeader("file:target/nospace", "Hello World", Exchange.FILE_NAME, "hello.txt");
template.sendBodyAndHeader("file:target/nospace", "Bye World", Exchange.FILE_NAME, "bye.txt");
assertMockEndpointsSatisfied();
assertEquals("Should pickup bye.txt file 2 times", 2, myReadLockStrategy.getCounter());
}
@Override
protected JndiRegistry createRegistry() throws Exception {
JndiRegistry jndi = super.createRegistry();
jndi.bind("myExceptionHandler", myExceptionHandler);
jndi.bind("myReadLockStrategy", myReadLockStrategy);
return jndi;
}
// START SNIPPET: e2
@Override
protected RouteBuilder createRouteBuilder() throws Exception {
return new RouteBuilder() {
@Override
public void configure() throws Exception {
// to handle any IOException being thrown
onException(IOException.class)
.handled(true)
.log("IOException occurred due: ${exception.message}")
// as we handle the exception we can send it to direct:file-error,
// where we could send out alerts or whatever we want
.to("direct:file-error");
// special route that handles file errors
from("direct:file-error")
.log("File error route triggered to deal with exception ${exception?.class}")
// as this is based on unit test just transform a message and send it to a mock
.transform().simple("Error ${exception.message}")
.to("mock:error");
// this is the file route that pickup files, notice how we use our custom exception handler on the consumer
// the exclusiveReadLockStrategy is only configured because this is from an unit test, so we use that to simulate exceptions
from("file:target/nospace?exclusiveReadLockStrategy=#myReadLockStrategy&consumer.exceptionHandler=#myExceptionHandler")
.convertBodyTo(String.class)
.to("mock:result");
}
};
}
// END SNIPPET: e2
// START SNIPPET: e1
/**
* Custom {@link ExceptionHandler} to be used on the file consumer, to send
* exceptions to a Camel route, to let Camel deal with the error.
*/
private static class MyExceptionHandler implements ExceptionHandler {
private ProducerTemplate template;
/**
* We use a producer template to send a message to the Camel route
*/
public void setTemplate(ProducerTemplate template) {
this.template = template;
}
@Override
public void handleException(Throwable exception) {
handleException(exception.getMessage(), exception);
}
@Override
public void handleException(String message, Throwable exception) {
handleException(exception.getMessage(), null, exception);
}
@Override
public void handleException(final String message, final Exchange originalExchange, final Throwable exception) {
// send the message to the special direct:file-error endpoint, which will trigger exception handling
//
template.send("direct:file-error", new Processor() {
@Override
public void process(Exchange exchange) throws Exception {
// set an exception on the message from the start so the error handling is triggered
exchange.setException(exception);
exchange.getIn().setBody(message);
}
});
}
}
// END SNIPPET: e1
// used for simulating exception during acquiring a lock on the file
private static class MyReadLockStrategy implements GenericFileExclusiveReadLockStrategy<File> {
private int counter;
@Override
public void prepareOnStartup(GenericFileOperations<File> operations, GenericFileEndpoint<File> endpoint) throws Exception {
// noop
}
@Override
public boolean acquireExclusiveReadLock(GenericFileOperations<File> operations, GenericFile<File> file, Exchange exchange) throws Exception {
if (file.getFileNameOnly().equals("bye.txt")) {
if (counter++ == 0) {
// force an exception on acquire attempt for the bye.txt file, on the first attempt
throw new IOException("Forced to simulate no space on device");
}
}
return true;
}
@Override
public void releaseExclusiveReadLock(GenericFileOperations<File> operations, GenericFile<File> file, Exchange exchange) throws Exception {
// noop
}
@Override
public void setTimeout(long timeout) {
// noop
}
@Override
public void setCheckInterval(long checkInterval) {
// noop
}
@Override
public void setReadLockLoggingLevel(LoggingLevel readLockLoggingLevel) {
// noop
}
public int getCounter() {
return counter;
}
}
}