| /* |
| * 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.geode.internal.admin.statalerts; |
| |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| |
| import org.apache.geode.SystemFailure; |
| |
| /** |
| * This class acts as a helper for the AlertManager & AlertAggregator for the execution of the user |
| * specified functions |
| * |
| * This class also keeps a registry of all the functions which are supported, which should be used |
| * during creation of alert definition. |
| * |
| */ |
| |
| public class FunctionHelper { |
| |
| private static final short FUN_AVG = 1; |
| |
| private static final short FUN_MIN = 2; |
| |
| private static final short FUN_MAX = 3; |
| |
| private static final short FUN_SUM = 4; |
| |
| private static final String STR_AVG = "Average"; |
| |
| private static final String STR_MIN = "Min Value"; |
| |
| private static final String STR_MAX = "Max Value"; |
| |
| private static final String STR_ADD = "Sum"; |
| |
| /** |
| * This function returns the available function names. |
| * |
| * @return List of the function names. |
| */ |
| public static String[] getFunctionNames() { |
| return new String[] {STR_ADD, STR_AVG, STR_MIN, STR_MAX}; |
| } |
| |
| /** |
| * This method returns the function's name for the requested function identifier. |
| * |
| * @param functionId Identifier of the function |
| * @return Function name. |
| */ |
| public static String getFunctionName(short functionId) { |
| switch (functionId) { |
| case FUN_AVG: |
| return STR_AVG; |
| case FUN_MIN: |
| return STR_MIN; |
| case FUN_MAX: |
| return STR_MAX; |
| case FUN_SUM: |
| return STR_ADD; |
| default: |
| return null; |
| } |
| } |
| |
| /** |
| * This function returns the function identifier for the requested function name. |
| * |
| * @param qFunctionName Name of the function |
| * @return Function identifier. |
| */ |
| public static short getFunctionIdentifier(String qFunctionName) { |
| |
| if (qFunctionName == null) |
| return -1; |
| |
| if (qFunctionName.equalsIgnoreCase(STR_ADD)) |
| return FUN_SUM; |
| if (qFunctionName.equalsIgnoreCase(STR_AVG)) |
| return FUN_AVG; |
| if (qFunctionName.equalsIgnoreCase(STR_MIN)) |
| return FUN_MIN; |
| if (qFunctionName.equalsIgnoreCase(STR_MAX)) |
| return FUN_MAX; |
| |
| return -1; |
| } |
| |
| /** |
| * Apply the given function of the given list of numbers and returns result |
| * |
| * @param functorId Id of function to be applied |
| * @param vals List of number on which function will be applied |
| * |
| */ |
| public static Number[] applyFunction(short functorId, Number[] vals) { |
| Number[] res = new Number[1]; |
| switch (functorId) { |
| case FUN_SUM: |
| res[0] = SUM(vals); |
| return res; |
| case FUN_AVG: |
| res[0] = AVG(vals); |
| return res; |
| case FUN_MIN: |
| res[0] = MIN(vals); |
| return res; |
| case FUN_MAX: |
| res[0] = MAX(vals); |
| return res; |
| default: |
| return null; |
| } |
| } |
| |
| /** |
| * Apply the SUM function on given list of number |
| * |
| * @param vals Array of number |
| */ |
| public static Number SUM(Number[] vals) { |
| try { |
| double sum = 0.0; |
| for (int i = 0; i < vals.length; i++) { |
| sum = sum + vals[i].doubleValue(); |
| } |
| return Double.valueOf(sum); |
| } catch (VirtualMachineError err) { |
| SystemFailure.initiateFailure(err); |
| // If this ever returns, rethrow the error. We're poisoned |
| // now, so don't let this thread continue. |
| throw err; |
| } catch (Throwable t) { |
| // Whenever you catch Error or Throwable, you must also |
| // catch VirtualMachineError (see above). However, there is |
| // _still_ a possibility that you are dealing with a cascading |
| // error condition, so you also need to check to see if the JVM |
| // is still usable: |
| SystemFailure.checkFailure(); |
| return null; |
| } |
| } |
| |
| /** |
| * Apply the Average function on given list of number |
| * |
| * @param vals Array of number |
| */ |
| public static Number AVG(Number[] vals) { |
| try { |
| return Double.valueOf(SUM(vals).doubleValue() / vals.length); |
| } catch (VirtualMachineError err) { |
| SystemFailure.initiateFailure(err); |
| // If this ever returns, rethrow the error. We're poisoned |
| // now, so don't let this thread continue. |
| throw err; |
| } catch (Throwable ex) { |
| // Whenever you catch Error or Throwable, you must also |
| // catch VirtualMachineError (see above). However, there is |
| // _still_ a possibility that you are dealing with a cascading |
| // error condition, so you also need to check to see if the JVM |
| // is still usable: |
| SystemFailure.checkFailure(); |
| return null; |
| } |
| } |
| |
| /** |
| * Apply the Minimum function on given list of number |
| * |
| * @param vals Array of number |
| */ |
| public static Number MIN(Number[] vals) { |
| try { |
| Collection col = Arrays.asList(vals); |
| Number min = (Number) Collections.max(col); |
| |
| return min; |
| } catch (VirtualMachineError err) { |
| SystemFailure.initiateFailure(err); |
| // If this ever returns, rethrow the error. We're poisoned |
| // now, so don't let this thread continue. |
| throw err; |
| } catch (Throwable t) { |
| // Whenever you catch Error or Throwable, you must also |
| // catch VirtualMachineError (see above). However, there is |
| // _still_ a possibility that you are dealing with a cascading |
| // error condition, so you also need to check to see if the JVM |
| // is still usable: |
| SystemFailure.checkFailure(); |
| return null; |
| } |
| } |
| |
| /** |
| * Apply the Maximum function on given list of number |
| * |
| * @param vals Array of number |
| */ |
| public static Number MAX(Number[] vals) { |
| try { |
| Collection col = Arrays.asList(vals); |
| Number max = (Number) Collections.max(col); |
| |
| return max; |
| } catch (VirtualMachineError err) { |
| SystemFailure.initiateFailure(err); |
| // If this ever returns, rethrow the error. We're poisoned |
| // now, so don't let this thread continue. |
| throw err; |
| } catch (Throwable t) { |
| // Whenever you catch Error or Throwable, you must also |
| // catch VirtualMachineError (see above). However, there is |
| // _still_ a possibility that you are dealing with a cascading |
| // error condition, so you also need to check to see if the JVM |
| // is still usable: |
| SystemFailure.checkFailure(); |
| return null; |
| } |
| } |
| |
| } |