/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.flink.runtime.webmonitor.handlers;
import org.apache.flink.runtime.executiongraph.AccessExecution;
import org.apache.flink.runtime.executiongraph.AccessExecutionVertex;
import org.apache.flink.runtime.webmonitor.ExecutionGraphHolder;
import java.util.Map;
/**
* Base class for request handlers whose response depends on a specific subtask execution attempt
* (defined via the "attempt" parameter) of a specific subtask (defined via the
* "subtasknum" parameter) in a specific job vertex (defined via the "vertexid" parameter) in a
* specific job, defined via (defined voa the "jobid" parameter).
*/
public abstract class AbstractSubtaskAttemptRequestHandler extends AbstractSubtaskRequestHandler {
public AbstractSubtaskAttemptRequestHandler(ExecutionGraphHolder executionGraphHolder) {
super(executionGraphHolder);
}
@Override
public String handleRequest(AccessExecutionVertex vertex, Map<String, String> params) throws Exception {
final String attemptNumberString = params.get("attempt");
if (attemptNumberString == null) {
throw new RuntimeException("Attempt number parameter missing");
}
final int attempt;
try {
attempt = Integer.parseInt(attemptNumberString);
}
catch (NumberFormatException e) {
throw new RuntimeException("Invalid attempt number parameter");
}
final AccessExecution currentAttempt = vertex.getCurrentExecutionAttempt();
if (attempt == currentAttempt.getAttemptNumber()) {
return handleRequest(currentAttempt, params);
}
else if (attempt >= 0 && attempt < currentAttempt.getAttemptNumber()) {
AccessExecution exec = vertex.getPriorExecutionAttempt(attempt);
if (exec != null) {
return handleRequest(exec, params);
} else {
throw new RequestHandlerException("Execution for attempt " + attempt +
" has already been deleted.");
}
}
else {
throw new RuntimeException("Attempt does not exist: " + attempt);
}
}
public abstract String handleRequest(AccessExecution execAttempt, Map<String, String> params) throws Exception;
}