org.elasticsearch.client.support.Headers Maven / Gradle / Ivy
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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.client.support;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.transport.TransportMessage;
/**
* Client request headers picked up from the client settings. Applied to every
* request sent by the client (both transport and node clients)
*/
public class Headers {
public static final String PREFIX = "request.headers";
public static final Headers EMPTY = new Headers(Settings.EMPTY) {
@Override
public > M applyTo(M message) {
return message;
}
};
private final Settings headers;
@Inject
public Headers(Settings settings) {
headers = resolveHeaders(settings);
}
public > M applyTo(M message) {
for (String key : headers.names()) {
if (!message.hasHeader(key)) {
message.putHeader(key, headers.get(key));
}
}
return message;
}
public Settings headers() {
return headers;
}
static Settings resolveHeaders(Settings settings) {
Settings headers = settings.getAsSettings(PREFIX);
return headers != null ? headers : Settings.EMPTY;
}
}