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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.filedistribution;
import com.yahoo.config.subscription.ConfigSourceSet;
import com.yahoo.jrt.Supervisor;
import com.yahoo.vespa.config.Connection;
import com.yahoo.vespa.config.JRTConnection;
import com.yahoo.vespa.config.JRTConnectionPool;
import java.util.List;
/**
* A pool of JRT connections to a set of file distribution source (one or more config servers).
* Used by file distribution clients, where the source that can serve a file reference might be
* different for each file reference (unlike config requests, where all requests should be served by the same source).
* A new connection is chosen randomly when calling {#link {@link #switchConnection(Connection failingConnection)}}.
* Unlike JRTConnectionPool there is no state that holds the 'current' connection, a new connection is picked
* randomly if {@link #getCurrent()} is called.
*
* @author hmusum
*/
public class FileDistributionConnectionPool extends JRTConnectionPool {
public FileDistributionConnectionPool(ConfigSourceSet sourceSet, Supervisor supervisor) {
super(sourceSet, supervisor);
}
@Override
public synchronized JRTConnection getCurrent() {
return pickNewConnectionRandomly(getSources());
}
@Override
public synchronized JRTConnection switchConnection(Connection failingConnection) {
if (getSources().size() <= 1) return getCurrent();
List<JRTConnection> sourceCandidates = getSources();
sourceCandidates.remove(failingConnection);
return pickNewConnectionRandomly(sourceCandidates);
}
}
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