com.dianping.cat.report.page.business.graph.CustomDataCalculator.java Source code

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Here is the source code for com.dianping.cat.report.page.business.graph.CustomDataCalculator.java

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/*
 * Copyright (c) 2011-2018, Meituan Dianping. All Rights Reserved.
 *
 * 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 com.dianping.cat.report.page.business.graph;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.commons.jexl3.JexlBuilder;
import org.apache.commons.jexl3.JexlEngine;
import org.apache.commons.jexl3.JexlException;
import org.apache.commons.jexl3.JexlExpression;
import org.unidal.lookup.annotation.Inject;

import com.dianping.cat.Cat;
import com.dianping.cat.report.page.business.task.BusinessKeyHelper;

public class CustomDataCalculator {

    private static final String START = "${";

    private static final String END = "}";

    private static final String SPLITTER = ",";

    private final JexlEngine jexl = new JexlBuilder().cache(512).strict(true).silent(false).create();

    @Inject
    private BusinessKeyHelper m_keyHelper;

    public List<CustomInfo> translatePattern(String pattern) {
        List<CustomInfo> infos = new ArrayList<CustomInfo>();
        boolean result = true;
        int length = pattern.length();
        int start = -1;
        int end = -1;

        do {
            start = pattern.indexOf(START, end + 1);
            end = pattern.indexOf(END, end + 1);

            if (start >= 0 && end > 0 && start < end) {
                CustomInfo customInfo = new CustomInfo();

                String subStr = pattern.substring(start + 2, end);
                String[] strs = subStr.split(SPLITTER);

                if (strs != null && strs.length == 3) {
                    customInfo.setDomain(strs[0].trim());
                    customInfo.setKey(strs[1].trim());
                    customInfo.setType(strs[2].trim().toUpperCase());
                    customInfo.setPattern(pattern.substring(start, end + 1));

                    infos.add(customInfo);
                } else {
                    result = false;
                }
            } else {
                if (!(start < 0 && end < 0)) {
                    result = false;
                }
            }
        } while (end >= 0 && start >= 0 && end < length);

        if (!result) {
            throw new RuntimeException("Wrong Business Pattern!");
        }

        return infos;
    }

    public double[] calculate(String pattern, List<CustomInfo> customInfos, Map<String, double[]> businessItemData,
            int totalSize) {
        double[] result = new double[totalSize];

        for (int i = 0; i < totalSize; i++) {
            try {
                String expression = pattern;

                for (CustomInfo customInfo : customInfos) {
                    String customPattern = customInfo.getPattern();
                    String itemId = m_keyHelper.generateKey(customInfo.getKey(), customInfo.getDomain(),
                            customInfo.getType());
                    double[] sourceData = businessItemData.get(itemId);

                    if (sourceData != null) {
                        expression = expression.replace(customPattern, Double.toString(sourceData[i]));
                    }
                }

                result[i] = calculate(expression);
            } catch (JexlException ex) {
                // Ignore
            } catch (Exception e) {
                Cat.logError(e);
            }
        }
        return result;
    }

    private double calculate(String pattern) {
        JexlExpression e = jexl.createExpression(pattern);
        Number result = (Number) e.evaluate(null);
        return result.doubleValue();
    }

}