| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.jshell.execution; |
| |
| import java.io.PrintWriter; |
| import java.io.StringWriter; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| import jdk.jshell.spi.ExecutionControl; |
| import jdk.jshell.spi.ExecutionControlProvider; |
| import jdk.jshell.spi.ExecutionEnv; |
| |
| /** |
| * Tries other providers in sequence until one works. |
| * |
| * @since 9 |
| */ |
| public class FailOverExecutionControlProvider implements ExecutionControlProvider{ |
| |
| private Logger logger = null; |
| |
| /** |
| * Create an instance. The instance can be used to start and return an |
| * {@link ExecutionControl} instance by attempting to start a series of |
| * {@code ExecutionControl} specs, until one is successful. |
| * |
| * @see #generate(jdk.jshell.spi.ExecutionEnv, java.util.Map) |
| */ |
| public FailOverExecutionControlProvider() { |
| } |
| |
| /** |
| * The unique name of this {@code ExecutionControlProvider}. |
| * |
| * @return "failover" |
| */ |
| @Override |
| public String name() { |
| return "failover"; |
| } |
| |
| /** |
| * Create and return the default parameter map for this |
| * {@code ExecutionControlProvider}. There are ten parameters, "0" through |
| * "9", their values are {@code ExecutionControlProvider} specification |
| * strings, or empty string. |
| * |
| * @return a default parameter map |
| */ |
| @Override |
| public Map<String, String> defaultParameters() { |
| Map<String, String> dp = new HashMap<>(); |
| dp.put("0", "jdi"); |
| for (int i = 1; i <= 9; ++i) { |
| dp.put("" + i, ""); |
| } |
| return dp; |
| } |
| |
| /** |
| * Create and return a locally executing {@code ExecutionControl} instance. |
| * At least one parameter should have a spec. |
| * |
| * @param env the execution environment, provided by JShell |
| * @param parameters the modified parameter map. |
| * @return the execution engine |
| * @throws Throwable if all the given providers fail, the exception that |
| * occurred on the first attempt to create the execution engine. |
| */ |
| @Override |
| public ExecutionControl generate(ExecutionEnv env, Map<String, String> parameters) |
| throws Throwable { |
| Throwable thrown = null; |
| StringWriter dumpsw = new StringWriter(); |
| PrintWriter dump = new PrintWriter(dumpsw); |
| for (int i = 0; i <= 9; ++i) { |
| String param = parameters.get("" + i); |
| if (param != null && !param.isEmpty()) { |
| try { |
| ExecutionControl ec = ExecutionControl.generate(env, param); |
| logger().finest( |
| String.format("FailOverExecutionControlProvider: Success %s -- %d = %s\n", |
| name(), i, param)); |
| return ec; |
| } catch (Throwable ex) { |
| logger().warning( |
| String.format("FailOverExecutionControlProvider: Failure %s -- %d = %s -- %s\n", |
| name(), i, param, ex.toString())); |
| StringWriter writer = new StringWriter(); |
| PrintWriter log = new PrintWriter(writer); |
| log.println("FailOverExecutionControlProvider:"); |
| ex.printStackTrace(log); |
| log.flush(); |
| logger().fine(writer.toString()); |
| // if they all fail, use the last as cause and include info about prior in message |
| dump.printf("FailOverExecutionControlProvider: FAILED: %d:%s --%n", i, param); |
| dump.printf(" Exception: %s%n", ex); |
| var st = ex.getStackTrace(); |
| for (int k = 0; k < 5 && k < st.length; ++k) { |
| dump.printf(" %s%n", st[k]); |
| } |
| if (ex.getCause() != null) { |
| dump.printf(" cause: %s%n", ex.getCause()); |
| } |
| thrown = ex; |
| } |
| } |
| |
| } |
| logger().severe("FailOverExecutionControlProvider: Terminating, failovers exhausted"); |
| if (thrown == null) { |
| throw new IllegalArgumentException("All least one parameter must be set to a provider."); |
| } |
| throw new RuntimeException(dumpsw.toString(), thrown); |
| } |
| |
| private Logger logger() { |
| if (logger == null) { |
| logger = Logger.getLogger("jdk.jshell.execution"); |
| if (logger.getLevel() == null) { |
| // Logging has not been specifically requested, turn it off |
| logger.setLevel(Level.OFF); |
| } |
| } |
| return logger; |
| } |
| |
| } |