io.cdap.cdap.internal.app.runtime.ProgramMessagePublisher Maven / Gradle / Ivy
/*
* Copyright © 2017-2018 Cask Data, Inc.
*
* 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 io.cdap.cdap.internal.app.runtime;
import io.cdap.cdap.api.messaging.MessagePublisher;
import io.cdap.cdap.api.messaging.TopicNotFoundException;
import io.cdap.cdap.api.security.AccessException;
import io.cdap.cdap.messaging.context.AbstractMessagePublisher;
import io.cdap.cdap.proto.id.NamespaceId;
import io.cdap.cdap.proto.id.TopicId;
import java.io.IOException;
import java.util.Iterator;
/**
* A {@link MessagePublisher} for program to use, which doesn't allow publishing to system namespace.
*/
final class ProgramMessagePublisher extends AbstractMessagePublisher {
private final MessagePublisher delegate;
ProgramMessagePublisher(MessagePublisher delegate) {
this.delegate = delegate;
}
@Override
protected void publish(TopicId topicId, Iterator payloads)
throws IOException, TopicNotFoundException, AccessException {
if (NamespaceId.SYSTEM.equals(topicId.getNamespaceId())) {
throw new IllegalArgumentException("Publish to '" + topicId.getNamespace() + "' namespace is not allowed");
}
delegate.publish(topicId.getNamespace(), topicId.getTopic(), payloads);
}
}