org.bndly.rest.controller.impl.DelegatingExceptionMapper Maven / Gradle / Ivy
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package org.bndly.rest.controller.impl;
/*-
* #%L
* REST Controller Impl
* %%
* Copyright (C) 2013 - 2020 Cybercon GmbH
* %%
* 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.
* #L%
*/
import org.bndly.rest.controller.api.ExceptionMapper;
import org.bndly.rest.controller.api.Response;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
public class DelegatingExceptionMapper implements ExceptionMapper {
private final List> mappers = new ArrayList<>();
private final ReadWriteLock mappserLock = new ReentrantReadWriteLock();
@Override
public Response toResponse(T throwable) {
Response r = null;
mappserLock.readLock().lock();
try {
for (ExceptionMapper exceptionMapper : mappers) {
try {
r = exceptionMapper.toResponse(throwable);
if (r != null) {
break;
}
} catch (ClassCastException ex) {
// no handling. hence return an empty response
}
}
return r;
} finally {
mappserLock.readLock().unlock();
}
}
public void clear() {
mappserLock.writeLock().lock();
try {
mappers.clear();
} finally {
mappserLock.writeLock().unlock();
}
}
public void registerMapper(ExceptionMapper mapper) {
mappserLock.writeLock().lock();
try {
mappers.add(0, mapper);
} finally {
mappserLock.writeLock().unlock();
}
}
public void unregisterMapper(ExceptionMapper mapper) {
mappserLock.writeLock().lock();
try {
mappers.remove(mapper);
} finally {
mappserLock.writeLock().unlock();
}
}
}