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Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.rest.action;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.rest.RestChannel;
import org.elasticsearch.rest.RestResponse;
import org.elasticsearch.tasks.TaskCancelledException;
/**
* An action listener that requires {@link #processResponse(Object)} to be implemented
* and will automatically handle failures.
*/
public abstract class RestActionListener implements ActionListener {
// we use static here so we won't have to pass the actual logger each time for a very rare case of logging
// where the settings don't matter that much
private static final Logger logger = LogManager.getLogger(RestResponseListener.class);
protected final RestChannel channel;
protected RestActionListener(RestChannel channel) {
this.channel = channel;
}
@Override
public final void onResponse(Response response) {
try {
ensureOpen();
processResponse(response);
} catch (Exception e) {
onFailure(e);
}
}
protected abstract void processResponse(Response response) throws Exception;
protected void ensureOpen() {
if (channel.request().getHttpChannel().isOpen() == false) {
throw new TaskCancelledException("response channel [" + channel.request().getHttpChannel() + "] closed");
}
}
@Override
public final void onFailure(Exception e) {
try {
channel.sendResponse(new RestResponse(channel, e));
} catch (Exception inner) {
inner.addSuppressed(e);
logger.error("failed to send failure response", inner);
}
}
}