/*
* 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 com.facebook.presto.execution;
import com.facebook.presto.Session;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;
public class QueryQueueDefinition
{
private static final Pattern USER_PATTERN = Pattern.compile(Pattern.quote("${USER}"));
private static final Pattern SOURCE_PATTERN = Pattern.compile(Pattern.quote("${SOURCE}"));
private final String template;
private final int maxConcurrent;
private final int maxQueued;
public QueryQueueDefinition(String template, int maxConcurrent, int maxQueued)
{
this.template = requireNonNull(template, "template is null");
Matcher matcher = Pattern.compile("\\$\\{(.*?)\\}").matcher(template);
while (matcher.find()) {
String group = matcher.group(1);
checkArgument(group.equals("USER") || group.equals("SOURCE"), "Unsupported template parameter: ${%s}", group);
}
checkArgument(maxConcurrent > 0, "maxConcurrent must be positive");
checkArgument(maxQueued > 0, "maxQueued must be positive");
this.maxConcurrent = maxConcurrent;
this.maxQueued = maxQueued;
}
public String getExpandedTemplate(Session session)
{
String expanded = USER_PATTERN.matcher(template).replaceAll(session.getUser());
return SOURCE_PATTERN.matcher(expanded).replaceAll(session.getSource().orElse(""));
}
String getTemplate()
{
return template;
}
public int getMaxConcurrent()
{
return maxConcurrent;
}
public int getMaxQueued()
{
return maxQueued;
}
}