问题:
在示例-CloudBalancing中，为什么此应用程序无法访问solver.getBestSolution()？该应用程序始终在solver.solve(unsolvedCloudBalance);上运行。
有什么建议？
这里的一些可能的解决方案是在solver.solve(unsolvedCloudBalance);处完成，然后获取solver.getBestSolution()？
/*
* Copyright 2012 JBoss Inc
*
......
*/
......
public class CloudBalancingHelloWorld {
public static void main(String[] args) {
// Build the Solver
SolverFactory solverFactory = SolverFactory.createFromXmlResource(
"org/optaplanner/examples/cloudbalancing/solver/cloudBalancingSolverConfig.xml");
Solver solver = solverFactory.buildSolver();
// Load a problem with 2 computers and 6 processes
CloudBalance unsolvedCloudBalance = new CloudBalancingGenerator().createCloudBalance(2, 6);
// Solve the problem
System.out.println("Test - solver - before");
solver.solve(unsolvedCloudBalance);
System.out.println("Test - solver - after");
// Display the result
CloudBalance solvedCloudBalance = (CloudBalance) solver.getBestSolution();
System.out.println("\nSolved cloudBalance with 2 computers and 6 processes:\n"
+ toDisplayString(solvedCloudBalance));
}
public static String toDisplayString(CloudBalance cloudBalance) {
StringBuilder displayString = new StringBuilder();
for (CloudProcess process : cloudBalance.getProcessList()) {
CloudComputer computer = process.getComputer();
displayString.append(" ").append(process.getLabel()).append(" -> ")
.append(computer == null ? null : computer.getLabel()).append("\n");
}
return displayString.toString();
}
}
最佳答案
我假设您没有编辑示例的规划求解配置XML文件。
如果查看XML文件，则正在加载Solver configuration from，它没有终止子句。基本上，您是在说规划求解要永远运行。
您可以编辑求解器配置XML文件，以使其在给定条件后终止。有关如何执行操作，请参见the documentation。
如果要以编程方式进行操作，请查看JavaDoc:SolverConfig类的SolverConfig#setTerminationConfig method和TerminationConfig class。加载XML文件后，您将需要编辑SolverFactory的SolverConfig:请参见SolverFactory#getSolverConfig方法。