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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.model.filedistribution;
import com.yahoo.config.FileReference;
import com.yahoo.config.model.api.FileDistribution;
import com.yahoo.config.application.api.FileRegistry;
import com.yahoo.vespa.model.Host;
import java.util.*;
import java.util.stream.Collectors;
import static java.util.Arrays.asList;
/**
* Responsible for directing distribution of files to hosts.
*
* @author tonytv
*/
public class FileDistributor {
private final FileRegistry fileRegistry;
/** A map from files to the hosts to which that file should be distributed */
private final Map<FileReference, Set<Host>> filesToHosts = new LinkedHashMap<>();
/**
* Adds the given file to the associated application packages' registry of file and marks the file
* for distribution to the given hosts.
* <b>Note: This class receives ownership of the given collection.</b>
*
* @return the reference to the file, created by the application package
*/
public FileReference sendFileToHosts(String relativePath, Collection<Host> hosts) {
FileReference reference = fileRegistry.addFile(relativePath);
addToFilesToDistribute(reference, hosts);
return reference;
}
/** Same as sendFileToHost(relativePath,Collections.singletonList(host) */
public FileReference sendFileToHost(String relativePath, Host host) {
return sendFileToHosts(relativePath, Arrays.asList(host));
}
private void addToFilesToDistribute(FileReference reference, Collection<Host> hosts) {
Set<Host> oldHosts = getHosts(reference);
oldHosts.addAll(hosts);
}
private Set<Host> getHosts(FileReference reference) {
Set<Host> hosts = filesToHosts.get(reference);
if (hosts == null) {
hosts = new HashSet<>();
filesToHosts.put(reference, hosts);
}
return hosts;
}
public FileDistributor(FileRegistry fileRegistry) {
this.fileRegistry = fileRegistry;
}
/** Returns the files which has been marked for distribution to the given host */
public Set<FileReference> filesToSendToHost(Host host) {
Set<FileReference> files = new HashSet<>();
for (Map.Entry<FileReference,Set<Host>> e : filesToHosts.entrySet()) {
if (e.getValue().contains(host)) {
files.add(e.getKey());
}
}
return files;
}
public Set<Host> getTargetHosts() {
Set<Host> hosts = new HashSet<>();
for (Set<Host> hostSubset: filesToHosts.values())
hosts.addAll(hostSubset);
return hosts;
}
public Set<String> getTargetHostnames() {
return getTargetHosts().stream().map(Host::getHostName).collect(Collectors.toSet());
}
/** Returns the host which is the source of the files */
public String fileSourceHost() {
return fileRegistry.fileSourceHost();
}
public Set<FileReference> allFilesToSend() {
return filesToHosts.keySet();
}
// should only be called during deploy
public void sendDeployedFiles(FileDistribution dbHandler) {
String fileSourceHost = fileSourceHost();
for (Host host : getTargetHosts()) {
if ( ! host.getHostName().equals(fileSourceHost)) {
dbHandler.sendDeployedFiles(host.getHostName(), filesToSendToHost(host));
}
}
dbHandler.sendDeployedFiles(fileSourceHost, allFilesToSend());
dbHandler.limitSendingOfDeployedFilesTo(union(getTargetHostnames(), fileSourceHost));
dbHandler.removeDeploymentsThatHaveDifferentApplicationId(getTargetHostnames());
}
// should only be called during deploy, and only once, since it leads to file distributor
// rescanning all files, which is very expensive ATM (April 2016)
public void reloadDeployFileDistributor(FileDistribution dbHandler) {
dbHandler.reloadDeployFileDistributor();
}
private Set<String> union(Set<String> hosts, String... additionalHosts) {
Set<String> result = new HashSet<>(hosts);
result.addAll(asList(additionalHosts));
return result;
}
}
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