| /* |
| * 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.slider.providers.agent; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.regex.Pattern; |
| |
| class AgentLaunchParameter { |
| public static final Logger log = |
| LoggerFactory.getLogger(AgentLaunchParameter.class); |
| private static final String DEFAULT_PARAMETER = ""; |
| private static final String ANY_COMPONENT = "ANY"; |
| private static final String NONE_VALUE = "NONE"; |
| private final Map<String, CommandTracker> launchParameterTracker; |
| |
| public AgentLaunchParameter(String parameters) { |
| launchParameterTracker = parseExpectedLaunchParameters(parameters); |
| } |
| |
| /** |
| * Get command for the component type |
| * |
| * @param componentName |
| * |
| * @return |
| */ |
| public String getNextLaunchParameter(String componentName) { |
| if (launchParameterTracker != null) { |
| if (launchParameterTracker.containsKey(componentName) |
| || launchParameterTracker.containsKey(ANY_COMPONENT)) { |
| synchronized (this) { |
| CommandTracker indexTracker = null; |
| if (launchParameterTracker.containsKey(componentName)) { |
| indexTracker = launchParameterTracker.get(componentName); |
| } else { |
| indexTracker = launchParameterTracker.get(ANY_COMPONENT); |
| } |
| |
| return indexTracker.getNextCommand(); |
| } |
| } |
| } |
| |
| return DEFAULT_PARAMETER; |
| } |
| |
| /** |
| * Parse launch parameters of the form ANY:PARAM_FOR_FIRST:PARAM_FOR_SECOND:...:PARAM_FOR_REST|HBASE_MASTER:... |
| * |
| * E.g. ANY:DO_NOT_REGISTER:DO_NOT_HEARTBEAT:NONE For any container, first one gets DO_NOT_REGISTER second one gets |
| * DO_NOT_HEARTBEAT, then all of the rest get nothing |
| * |
| * E.g. HBASE_MASTER:FAIL_AFTER_START:NONE For HBASE_MASTER, first one gets FAIL_AFTER_START then "" for all |
| * |
| * @param launchParameters |
| * |
| * @return |
| */ |
| Map<String, CommandTracker> parseExpectedLaunchParameters(String launchParameters) { |
| Map<String, CommandTracker> trackers = null; |
| if (launchParameters != null && launchParameters.length() > 0) { |
| String[] componentSpecificParameters = launchParameters.split(Pattern.quote("|")); |
| for (String componentSpecificParameter : componentSpecificParameters) { |
| if (componentSpecificParameter.length() != 0) { |
| String[] parameters = componentSpecificParameter.split(Pattern.quote(":")); |
| |
| if (parameters.length > 1 && parameters[0].length() > 0) { |
| |
| for (int index = 1; index < parameters.length; index++) { |
| if (parameters[index].equals(NONE_VALUE)) { |
| parameters[index] = DEFAULT_PARAMETER; |
| } |
| } |
| |
| if (trackers == null) { |
| trackers = new HashMap<String, CommandTracker>(10); |
| } |
| String componentName = parameters[0]; |
| CommandTracker tracker = new CommandTracker(Arrays.copyOfRange(parameters, 1, parameters.length)); |
| trackers.put(componentName, tracker); |
| } |
| } |
| } |
| } |
| |
| return trackers; |
| } |
| |
| class CommandTracker { |
| private final int maxIndex; |
| private final String[] launchCommands; |
| private int currentIndex; |
| |
| CommandTracker(String[] launchCommands) { |
| this.currentIndex = 0; |
| this.maxIndex = launchCommands.length - 1; |
| this.launchCommands = launchCommands; |
| } |
| |
| String getNextCommand() { |
| String retVal = launchCommands[currentIndex]; |
| if (currentIndex != maxIndex) { |
| currentIndex++; |
| } |
| |
| return retVal; |
| } |
| } |
| } |