/*
* Copyright 2014 the original author or authors.
*
* Licensed 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 ratpack.exec.internal;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import ratpack.exec.ExecInterceptor;
import ratpack.util.ExceptionUtils;
import java.util.List;
public abstract class InterceptedOperation {
private final static Logger LOGGER = LoggerFactory.getLogger(InterceptedOperation.class);
private final ExecInterceptor.ExecType type;
private final List<ExecInterceptor> interceptors;
private Throwable thrown;
private int i;
public InterceptedOperation(ExecInterceptor.ExecType type, List<ExecInterceptor> interceptors) {
this.type = type;
this.interceptors = interceptors;
i = 0;
}
public void run() throws Exception {
if (interceptors.isEmpty()) {
performOperation();
} else {
nextInterceptor();
if (thrown != null) {
throw ExceptionUtils.toException(thrown);
}
}
}
private void nextInterceptor() {
if (i < interceptors.size()) {
int iAtStart = i;
ExecInterceptor interceptor = interceptors.get(i);
Runnable continuation = () -> {
try {
++i;
nextInterceptor();
} catch (Exception ignore) {
// do nothing
}
};
try {
interceptor.intercept(type, continuation);
} catch (Throwable e) {
LOGGER.error("", e);
if (i == iAtStart) {
continuation.run();
}
}
} else {
try {
performOperation();
} catch (Throwable e) {
thrown = e;
}
}
}
abstract protected void performOperation() throws Exception;
}