Jmeter 二次开发 将CSV Data Set Config添加从哪一行开始读数据

经常遇到性能测试的时候，有100万条数据，才用了5万条，中途因为某些原因停止了，继续用的时候，

要么要清除DB中数据，要么要清除数据源中的数据，

觉得特别麻烦，

希望改写下代码，将

Ignore first line (only used if Variable Names is not empty)一列变成开始圆形需要选择的行数， StartLineNumber或者新增一个属性，StartLineNumber，原有的属性不需要更改。

看了一下大概涉及的java文件如下：config目录下的CSVDataSet和CSVDataSetBeanInfo，以及gui页面上的信息，gui又有几个语言版本，都要稍加修改。

Core目录下的Services目录下的FileServer， 其中Readline方法

要采取第一种，改写Ignore first line 为StartLineNumber. 我觉得这种比较合理，一个忽略第一行，从第二行开始；另一个直接设置开始的行数。

初步想法：

1. 为空，则从第一行开始

2. 有值，必须在【0，文件的行数-1】区间，从设置的行数开始。

3. 如果选择Recyle on EOF， 首次从N行开始，接下去从0行开始取值？。。。。【其实从N行开始取值，就不应当可循环】

更新20180828， 改好了，如下，有点丑

页面布局没有注意，放到了最上面，并且ignoreFirstLine没有去除

自己测试了下，用了一个BeanShell Sampler

查看结果树看到的确是从20开始取值的

修改的代码：

CSVDataSet

/*
 * 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.jmeter.config;

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.io.IOException;
import java.util.ResourceBundle;

import org.apache.commons.lang3.StringUtils;
import org.apache.jmeter.engine.event.LoopIterationEvent;
import org.apache.jmeter.engine.event.LoopIterationListener;
import org.apache.jmeter.engine.util.NoConfigMerge;
import org.apache.jmeter.gui.GUIMenuSortOrder;
import org.apache.jmeter.save.CSVSaveService;
import org.apache.jmeter.services.FileServer;
import org.apache.jmeter.testbeans.TestBean;
import org.apache.jmeter.testbeans.gui.GenericTestBeanCustomizer;
import org.apache.jmeter.testelement.property.JMeterProperty;
import org.apache.jmeter.testelement.property.StringProperty;
import org.apache.jmeter.threads.JMeterContext;
import org.apache.jmeter.threads.JMeterVariables;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jorphan.util.JMeterStopThreadException;
import org.apache.jorphan.util.JOrphanUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Read lines from a file and split int variables.
 *
 * The iterationStart() method is used to set up each set of values.
 *
 * By default, the same file is shared between all threads
 * (and other thread groups, if they use the same file name).
 *
 * The shareMode can be set to:
 * <ul>
 * <li>All threads - default, as described above</li>
 * <li>Current thread group</li>
 * <li>Current thread</li>
 * <li>Identifier - all threads sharing the same identifier</li>
 * </ul>
 *
 * The class uses the FileServer alias mechanism to provide the different share modes.
 * For all threads, the file alias is set to the file name.
 * Otherwise, a suffix is appended to the filename to make it unique within the required context.
 * For current thread group, the thread group identityHashcode is used;
 * for individual threads, the thread hashcode is used as the suffix.
 * Or the user can provide their own suffix, in which case the file is shared between all
 * threads with the same suffix.
 *
 */
@GUIMenuSortOrder(1)
public class CSVDataSet extends ConfigTestElement
        implements TestBean, LoopIterationListener, NoConfigMerge {
    private static final Logger log = LoggerFactory.getLogger(CSVDataSet.class);

    private static final long serialVersionUID = 233L;

    private static final String EOFVALUE = // value to return at EOF
            JMeterUtils.getPropDefault("csvdataset.eofstring", "<EOF>"); //$NON-NLS-1$ //$NON-NLS-2$

    private transient String filename;

    private transient String fileEncoding;

    private transient String variableNames;

    private transient String delimiter;

    private transient boolean quoted;

    private transient boolean recycle = true;

    private transient boolean stopThread;

    private transient String[] vars;

    private transient String alias;
    private transient String linenumber;

    private transient String shareMode;

    private boolean firstLineIsNames = false;

    private boolean ignoreFirstLine = false;

    private Object readResolve(){
        recycle = true;
        return this;
    }

    /**
     * Override the setProperty method in order to convert
     * the original String shareMode property.
     * This used the locale-dependent display value, so caused
     * problems when the language was changed.
     * If the "shareMode" value matches a resource value then it is converted
     * into the resource key.
     * To reduce the need to look up resources, we only attempt to
     * convert values with spaces in them, as these are almost certainly
     * not variables (and they are definitely not resource keys).
     */
    @Override
    public void setProperty(JMeterProperty property) {
        if (property instanceof StringProperty) {
            final String propName = property.getName();
            if ("shareMode".equals(propName)) { // The original name of the property
                final String propValue = property.getStringValue();
                if (propValue.contains(" ")){ // variables are unlikely to contain spaces, so most likely a translation
                    try {
                        final BeanInfo beanInfo = Introspector.getBeanInfo(this.getClass());
                        final ResourceBundle rb = (ResourceBundle) beanInfo.getBeanDescriptor().getValue(GenericTestBeanCustomizer.RESOURCE_BUNDLE);
                        for(String resKey : CSVDataSetBeanInfo.getShareTags()) {
                            if (propValue.equals(rb.getString(resKey))) {
                                if (log.isDebugEnabled()) {
                                    log.debug("Converted {}={} to {} using Locale: {}", propName, propValue, resKey, rb.getLocale());
                                }
                                ((StringProperty) property).setValue(resKey); // reset the value
                                super.setProperty(property);
                                return;
                            }
                        }
                        // This could perhaps be a variable name
                        log.warn("Could not translate {}={} using Locale: {}", propName, propValue, rb.getLocale());
                    } catch (IntrospectionException e) {
                        log.error("Could not find BeanInfo; cannot translate shareMode entries", e);
                    }
                }
            }
        }
        super.setProperty(property);
    }

    @Override
    public void iterationStart(LoopIterationEvent iterEvent) {
        FileServer server = FileServer.getFileServer();
        final JMeterContext context = getThreadContext();
        String delim = getDelimiter();
        if ("\\t".equals(delim)) { // $NON-NLS-1$
            delim = "\t";// Make it easier to enter a Tab // $NON-NLS-1$
        } else if (delim.isEmpty()){
            log.debug("Empty delimiter, will use ‘,‘");
            delim=",";
        }
        if (vars == null) {
            String fileName = getFilename().trim();
            String mode = getShareMode();
            int modeInt = CSVDataSetBeanInfo.getShareModeAsInt(mode);
            switch(modeInt){
                case CSVDataSetBeanInfo.SHARE_ALL:
                    alias = fileName;
                    break;
                case CSVDataSetBeanInfo.SHARE_GROUP:
                    alias = fileName+"@"+System.identityHashCode(context.getThreadGroup());
                    break;
                case CSVDataSetBeanInfo.SHARE_THREAD:
                    alias = fileName+"@"+System.identityHashCode(context.getThread());
                    break;
                default:
                    alias = fileName+"@"+mode; // user-specified key
                    break;
            }
            final String names = getVariableNames();
            if (StringUtils.isEmpty(names)) {
                String header = server.reserveFile(fileName, getFileEncoding(), alias, true);
                try {
                    vars = CSVSaveService.csvSplitString(header, delim.charAt(0));
                    firstLineIsNames = true;
                } catch (IOException e) {
                    throw new IllegalArgumentException("Could not split CSV header line from file:" + fileName,e);
                }
            } else {
                server.reserveFile(fileName, getFileEncoding(), alias, ignoreFirstLine);
                vars = JOrphanUtils.split(names, ","); // $NON-NLS-1$
            }
            trimVarNames(vars);
        }

        // TODO: fetch this once as per vars above?
        JMeterVariables threadVars = context.getVariables();
        String[] lineValues = {};
        try {
            if (getQuotedData()) {
                lineValues = server.getParsedLine(alias, recycle,linenumber, delim.charAt(0));
            } else {
                //String line = server.readLine(alias, recycle,firstLineIsNames || ignoreFirstLine);
                String line = server.readLine(alias, recycle,linenumber);
                lineValues = JOrphanUtils.split(line, delim, false);
            }
            for (int a = 0; a < vars.length && a < lineValues.length; a++) {
                threadVars.put(vars[a], lineValues[a]);
            }
        } catch (IOException e) { // treat the same as EOF
            log.error(e.toString());
        }
        if (lineValues.length == 0) {// i.e. EOF
            if (getStopThread()) {
                throw new JMeterStopThreadException("End of file:"+ getFilename()+" detected for CSV DataSet:"
                        +getName()+" configured with stopThread:"+ getStopThread()+", recycle:" + getRecycle());
            }
            for (String var :vars) {
                threadVars.put(var, EOFVALUE);
            }
        }
    }

    /**
     * trim content of array varNames
     * @param varsNames
     */
    private void trimVarNames(String[] varsNames) {
        for (int i = 0; i < varsNames.length; i++) {
            varsNames[i] = varsNames[i].trim();
        }
    }

    /**
     * @return Returns the filename.
     */
    public String getFilename() {
        return filename;
    }

    public String getLinenumber() {
        return linenumber;
    }

    public void setLinenumber(String linenumber) {
        this.linenumber = linenumber;
    }

    /**
     * @param filename
     *            The filename to set.
     */
    public void setFilename(String filename) {
        this.filename = filename;
    }

    /**
     * @return Returns the file encoding.
     */
    public String getFileEncoding() {
        return fileEncoding;
    }

    /**
     * @param fileEncoding
     *            The fileEncoding to set.
     */
    public void setFileEncoding(String fileEncoding) {
        this.fileEncoding = fileEncoding;
    }

    /**
     * @return Returns the variableNames.
     */
    public String getVariableNames() {
        return variableNames;
    }

    /**
     * @param variableNames
     *            The variableNames to set.
     */
    public void setVariableNames(String variableNames) {
        this.variableNames = variableNames;
    }

    public String getDelimiter() {
        return delimiter;
    }

    public void setDelimiter(String delimiter) {
        this.delimiter = delimiter;
    }

    public boolean getQuotedData() {
        return quoted;
    }

    public void setQuotedData(boolean quoted) {
        this.quoted = quoted;
    }

    public boolean getRecycle() {
        return recycle;
    }

    public void setRecycle(boolean recycle) {
        this.recycle = recycle;
    }

    public boolean getStopThread() {
        return stopThread;
    }

    public void setStopThread(boolean value) {
        this.stopThread = value;
    }

    public String getShareMode() {
        return shareMode;
    }

    public void setShareMode(String value) {
        this.shareMode = value;
    }

    /**
     * @return the ignoreFirstLine
     */
    public boolean isIgnoreFirstLine() {
        return ignoreFirstLine;
    }

    /**
     * @param ignoreFirstLine the ignoreFirstLine to set
     */
    public void setIgnoreFirstLine(boolean ignoreFirstLine) {
        this.ignoreFirstLine = ignoreFirstLine;
    }
}

CSVDataSetBeanInfo

/*
 * 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.jmeter.config;

import java.beans.PropertyDescriptor;

import org.apache.jmeter.testbeans.BeanInfoSupport;
import org.apache.jmeter.testbeans.gui.FileEditor;
import org.apache.jmeter.testbeans.gui.TypeEditor;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jorphan.util.JOrphanUtils;

public class CSVDataSetBeanInfo extends BeanInfoSupport {

    // These names must agree case-wise with the variable and property names
    private static final String FILENAME = "filename";               //$NON-NLS-1$
    private static final String FILE_ENCODING = "fileEncoding";      //$NON-NLS-1$
    private static final String VARIABLE_NAMES = "variableNames";    //$NON-NLS-1$
    private static final String IGNORE_FIRST_LINE = "ignoreFirstLine";    //$NON-NLS-1$
    private static final String DELIMITER = "delimiter";             //$NON-NLS-1$
    private static final String RECYCLE = "recycle";                 //$NON-NLS-1$
    private static final String STOPTHREAD = "stopThread";           //$NON-NLS-1$
    private static final String QUOTED_DATA = "quotedData";          //$NON-NLS-1$
    private static final String SHAREMODE = "shareMode";             //$NON-NLS-1$
    private static final String LINE_NUMBER = "linenumber";

    // Access needed from CSVDataSet
    private static final String[] SHARE_TAGS = new String[3];
    static final int SHARE_ALL    = 0;
    static final int SHARE_GROUP  = 1;
    static final int SHARE_THREAD = 2;

    // Store the resource keys
    static {
        SHARE_TAGS[SHARE_ALL]    = "shareMode.all"; //$NON-NLS-1$
        SHARE_TAGS[SHARE_GROUP]  = "shareMode.group"; //$NON-NLS-1$
        SHARE_TAGS[SHARE_THREAD] = "shareMode.thread"; //$NON-NLS-1$
    }

    public CSVDataSetBeanInfo() {
        super(CSVDataSet.class);

        createPropertyGroup("csv_data",             //$NON-NLS-1$
                new String[] { FILENAME, FILE_ENCODING, VARIABLE_NAMES,
                        IGNORE_FIRST_LINE, DELIMITER, QUOTED_DATA,
                        RECYCLE, STOPTHREAD, SHAREMODE });

        PropertyDescriptor p = property(FILENAME);
        p.setValue(NOT_UNDEFINED, Boolean.TRUE);
        p.setValue(DEFAULT, "");        //$NON-NLS-1$
        p.setValue(NOT_EXPRESSION, Boolean.TRUE);
        p.setPropertyEditorClass(FileEditor.class);

        p = property(FILE_ENCODING, TypeEditor.ComboStringEditor);
        p.setValue(NOT_UNDEFINED, Boolean.TRUE);
        p.setValue(DEFAULT, "");        //$NON-NLS-1$
        p.setValue(TAGS, getListFileEncoding());

        p = property(VARIABLE_NAMES);
        p.setValue(NOT_UNDEFINED, Boolean.TRUE);
        p.setValue(DEFAULT, "");        //$NON-NLS-1$
        p.setValue(NOT_EXPRESSION, Boolean.TRUE);

        p = property(IGNORE_FIRST_LINE);
        p.setValue(NOT_UNDEFINED, Boolean.TRUE);
        p.setValue(DEFAULT, Boolean.FALSE);

        //添加LINE_number的配置
        p = property(LINE_NUMBER);
        p.setValue(NOT_UNDEFINED, Boolean.TRUE);
        p.setValue(DEFAULT, "");
        p.setValue(NOT_EXPRESSION, Boolean.TRUE);

        p = property(DELIMITER);
        p.setValue(NOT_UNDEFINED, Boolean.TRUE);
        p.setValue(DEFAULT, ",");        //$NON-NLS-1$
        p.setValue(NOT_EXPRESSION, Boolean.TRUE);

        p = property(QUOTED_DATA);
        p.setValue(NOT_UNDEFINED, Boolean.TRUE);
        p.setValue(DEFAULT, Boolean.FALSE);

        p = property(RECYCLE);
        p.setValue(NOT_UNDEFINED, Boolean.TRUE);
        p.setValue(DEFAULT, Boolean.TRUE);

        p = property(STOPTHREAD);
        p.setValue(NOT_UNDEFINED, Boolean.TRUE);
        p.setValue(DEFAULT, Boolean.FALSE);

        p = property(SHAREMODE, TypeEditor.ComboStringEditor);
        p.setValue(RESOURCE_BUNDLE, getBeanDescriptor().getValue(RESOURCE_BUNDLE));
        p.setValue(NOT_UNDEFINED, Boolean.TRUE);
        p.setValue(DEFAULT, SHARE_TAGS[SHARE_ALL]);
        p.setValue(NOT_OTHER, Boolean.FALSE);
        p.setValue(NOT_EXPRESSION, Boolean.FALSE);
        p.setValue(TAGS, SHARE_TAGS);
    }

    public static int getShareModeAsInt(String mode) {
        if (mode == null || mode.length() == 0){
            return SHARE_ALL; // default (e.g. if test plan does not have definition)
        }
        for (int i = 0; i < SHARE_TAGS.length; i++) {
            if (SHARE_TAGS[i].equals(mode)) {
                return i;
            }
        }
        return -1;
    }

    /**
     * @return array of String for possible sharing modes
     */
    public static String[] getShareTags() {
        String[] copy = new String[SHARE_TAGS.length];
        System.arraycopy(SHARE_TAGS, 0, copy, 0, SHARE_TAGS.length);
        return copy;
    }

    /**
     * Get the mains file encoding
     * list from https://docs.oracle.com/javase/8/docs/technotes/guides/intl/encoding.doc.html
     * @return a String[] with the list of file encoding
     */
    private String[] getListFileEncoding() {
        return JOrphanUtils.split(JMeterUtils.getPropDefault("csvdataset.file.encoding_list", ""), "|"); //$NON-NLS-1$
    }

}

CSVDataSetResources.properties

#   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.
#   LINE_NUMBER=StartFromLineNumber

displayName=CSV Data Set Config
csv_data.displayName=Configure the CSV Data Source
filename.displayName=Filename
filename.shortDescription=Name of the file that holds the cvs data (relative or absolute filename)
fileEncoding.displayName=File encoding
fileEncoding.shortDescription=The character set encoding used in the file
#   ignoreFirstLine.displayName=Ignore first line (only used if Variable Names is not empty)
linenumber.displayName=StartFromLineNumber
linenumber.shortDescription=if linenumber blank, all the data would be involved;if linenum has value N, will read data from row N
#   ignoreFirstLine.shortDescription=Ignore first line of CSV file, it will only be used used if Variable Names is not empty, if Variable Names is empty the first line must contain the headers.
variableNames.displayName=Variable Names (comma-delimited)
variableNames.shortDescription=List your variable names in order to match the order of columns in your csv data. Keep it empty to use the first line of the file for variable names.
delimiter.displayName=Delimiter (use ‘\\t‘ for tab)
delimiter.shortDescription=Enter the delimiter (‘\\t‘ for tab)
quotedData.displayName=Allow quoted data?
quotedData.shortDescription=Allow CSV data values to be quoted?
recycle.displayName=Recycle on EOF ?
recycle.shortDescription=Should the file be re-read from the start on reaching EOF ?
stopThread.displayName=Stop thread on EOF ?
stopThread.shortDescription=Should the thread be stopped on reaching EOF (if Recycle is false) ?
shareMode.displayName=Sharing mode
shareMode.shortDescription=Select which threads share the same file pointer
shareMode.all=All threads
shareMode.group=Current thread group
shareMode.thread=Current thread

FileServer

/*
 * 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.jmeter.services;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.Closeable;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ThreadLocalRandom;

import org.apache.commons.collections.ArrayStack;
import org.apache.jmeter.gui.JMeterFileFilter;
import org.apache.jmeter.save.CSVSaveService;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jorphan.util.JOrphanUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This class provides thread-safe access to files, and to
 * provide some simplifying assumptions about where to find files and how to
 * name them. For instance, putting supporting files in the same directory as
 * the saved test plan file allows users to refer to the file with just it‘s
 * name - this FileServer class will find the file without a problem.
 * Eventually, I want all in-test file access to be done through here, with the
 * goal of packaging up entire test plans as a directory structure that can be
 * sent via rmi to remote servers (currently, one must make sure the remote
 * server has all support files in a relative-same location) and to package up
 * test plans to execute on unknown boxes that only have Java installed.
 */
public class FileServer {

    private static final Logger log = LoggerFactory.getLogger(FileServer.class);

    /**
     * The default base used for resolving relative files, i.e.<br/>
     * {@code System.getProperty("user.dir")}
     */
    private static final String DEFAULT_BASE = System.getProperty("user.dir");// $NON-NLS-1$

    /** Default base prefix: {@value} */
    private static final String BASE_PREFIX_DEFAULT = "~/"; // $NON-NLS-1$

    private static final String BASE_PREFIX =
            JMeterUtils.getPropDefault("jmeter.save.saveservice.base_prefix", // $NON-NLS-1$
                    BASE_PREFIX_DEFAULT);

    private File base;

    private final Map<String, FileEntry> files = new HashMap<>();

    private static final FileServer server = new FileServer();

    // volatile needed to ensure safe publication
    private volatile String scriptName;

    // Cannot be instantiated
    private FileServer() {
        base = new File(DEFAULT_BASE);
        log.info("Default base=‘{}‘", DEFAULT_BASE);
    }

    /**
     * @return the singleton instance of the server.
     */
    public static FileServer getFileServer() {
        return server;
    }

    /**
     * Resets the current base to {@link #DEFAULT_BASE}.
     */
    public synchronized void resetBase() {
        checkForOpenFiles();
        base = new File(DEFAULT_BASE);
        log.info("Reset base to ‘{}‘", base);
    }

    /**
     * Sets the current base directory for relative file names from the provided path.
     * If the path does not refer to an existing directory, then its parent is used.
     * Normally the provided path is a file, so using the parent directory is appropriate.
     *
     * @param basedir the path to set, or {@code null} if the GUI is being cleared
     * @throws IllegalStateException if files are still open
     */
    public synchronized void setBasedir(String basedir) {
        checkForOpenFiles(); // TODO should this be called if basedir == null?
        if (basedir != null) {
            File newBase = new File(basedir);
            if (!newBase.isDirectory()) {
                newBase = newBase.getParentFile();
            }
            base = newBase;
            log.info("Set new base=‘{}‘", base);
        }
    }

    /**
     * Sets the current base directory for relative file names from the provided script file.
     * The parameter is assumed to be the path to a JMX file, so the base directory is derived
     * from its parent.
     *
     * @param scriptPath the path of the script file; must be not be {@code null}
     * @throws IllegalStateException if files are still open
     * @throws IllegalArgumentException if scriptPath parameter is null
     */
    public synchronized void setBaseForScript(File scriptPath) {
        if (scriptPath == null){
            throw new IllegalArgumentException("scriptPath must not be null");
        }
        setScriptName(scriptPath.getName());
        // getParentFile() may not work on relative paths
        setBase(scriptPath.getAbsoluteFile().getParentFile());
    }

    /**
     * Sets the current base directory for relative file names.
     *
     * @param jmxBase the path of the script file base directory, cannot be null
     * @throws IllegalStateException if files are still open
     * @throws IllegalArgumentException if {@code basepath} is null
     */
    public synchronized void setBase(File jmxBase) {
        if (jmxBase == null) {
            throw new IllegalArgumentException("jmxBase must not be null");
        }
        checkForOpenFiles();
        base = jmxBase;
        log.info("Set new base=‘{}‘", base);
    }

    /**
     * Check if there are entries in use.
     * <p>
     * Caller must ensure that access to the files map is single-threaded as
     * there is a window between checking the files Map and clearing it.
     *
     * @throws IllegalStateException if there are any entries still in use
     */
    private void checkForOpenFiles() throws IllegalStateException {
        if (filesOpen()) { // checks for entries in use
            throw new IllegalStateException("Files are still open, cannot change base directory");
        }
        files.clear(); // tidy up any unused entries
    }

    public synchronized String getBaseDir() {
        return base.getAbsolutePath();
    }

    public static String getDefaultBase(){
        return DEFAULT_BASE;
    }

    /**
     * Calculates the relative path from {@link #DEFAULT_BASE} to the current base,
     * which must be the same as or a child of the default.
     *
     * @return the relative path, or {@code "."} if the path cannot be determined
     */
    public synchronized File getBaseDirRelative() {
        // Must first convert to absolute path names to ensure parents are available
        File parent = new File(DEFAULT_BASE).getAbsoluteFile();
        File f = base.getAbsoluteFile();
        ArrayStack l = new ArrayStack();
        while (f != null) {
            if (f.equals(parent)){
                if (l.isEmpty()){
                    break;
                }
                File rel = new File((String) l.pop());
                while(!l.isEmpty()) {
                    rel = new File(rel, (String) l.pop());
                }
                return rel;
            }
            l.push(f.getName());
            f = f.getParentFile();
        }
        return new File(".");
    }

    /**
     * Creates an association between a filename and a File inputOutputObject,
     * and stores it for later use - unless it is already stored.
     *
     * @param filename - relative (to base) or absolute file name (must not be null)
     */
    public void reserveFile(String filename) {
        reserveFile(filename,null);
    }

    /**
     * Creates an association between a filename and a File inputOutputObject,
     * and stores it for later use - unless it is already stored.
     *
     * @param filename - relative (to base) or absolute file name (must not be null)
     * @param charsetName - the character set encoding to use for the file (may be null)
     */
    public void reserveFile(String filename, String charsetName) {
        reserveFile(filename, charsetName, filename, false);
    }

    /**
     * Creates an association between a filename and a File inputOutputObject,
     * and stores it for later use - unless it is already stored.
     *
     * @param filename - relative (to base) or absolute file name (must not be null)
     * @param charsetName - the character set encoding to use for the file (may be null)
     * @param alias - the name to be used to access the object (must not be null)
     */
    public void reserveFile(String filename, String charsetName, String alias) {
        reserveFile(filename, charsetName, alias, false);
    }

    /**
     * Creates an association between a filename and a File inputOutputObject,
     * and stores it for later use - unless it is already stored.
     *
     * @param filename - relative (to base) or absolute file name (must not be null or empty)
     * @param charsetName - the character set encoding to use for the file (may be null)
     * @param alias - the name to be used to access the object (must not be null)
     * @param hasHeader true if the file has a header line describing the contents
     * @return the header line; may be null
     * @throws IllegalArgumentException if header could not be read or filename is null or empty
     */
    public synchronized String reserveFile(String filename, String charsetName, String alias, boolean hasHeader) {
        if (filename == null || filename.isEmpty()){
            throw new IllegalArgumentException("Filename must not be null or empty");
        }
        if (alias == null){
            throw new IllegalArgumentException("Alias must not be null");
        }
        FileEntry fileEntry = files.get(alias);
        if (fileEntry == null) {
            fileEntry = new FileEntry(resolveFileFromPath(filename), null, charsetName);
            if (filename.equals(alias)){
                log.info("Stored: {}", filename);
            } else {
                log.info("Stored: {} Alias: {}", filename, alias);
            }
            files.put(alias, fileEntry);
            if (hasHeader) {
                try {
                    fileEntry.headerLine = readLine(alias, false);
                    if (fileEntry.headerLine == null) {
                        fileEntry.exception = new EOFException("File is empty: " + fileEntry.file);
                    }
                } catch (IOException | IllegalArgumentException e) {
                    fileEntry.exception = e;
                }
            }
        }
        if (hasHeader && fileEntry.headerLine == null) {
            throw new IllegalArgumentException("Could not read file header line for file " + filename,
                    fileEntry.exception);
        }
        return fileEntry.headerLine;
    }

    /**
     * Resolves file name into {@link File} instance.
     * When filename is not absolute and not found from current working dir,
     * it tries to find it under current base directory
     * @param filename original file name
     * @return {@link File} instance
     */
    private File resolveFileFromPath(String filename) {
        File f = new File(filename);
        if (f.isAbsolute() || f.exists()) {
            return f;
        } else {
            return new File(base, filename);
        }
    }

    /**
     * Get the next line of the named file, recycle by default.
     *
     * @param filename the filename or alias that was used to reserve the file
     * @return String containing the next line in the file
     * @throws IOException when reading of the file fails, or the file was not reserved properly
     */
    public String readLine(String filename) throws IOException {
        return readLine(filename, true);
    }

    /**
     * Get the next line of the named file, first line is name to false
     *
     * @param filename the filename or alias that was used to reserve the file
     * @param recycle - should file be restarted at EOF?
     * @return String containing the next line in the file (null if EOF reached and not recycle)
     * @throws IOException when reading of the file fails, or the file was not reserved properly
     */
    public String readLine(String filename, boolean recycle) throws IOException {
        return readLine(filename, recycle, "1");
    }
    /**
     * Get the next line of the named file
     *
     * @param filename the filename or alias that was used to reserve the file
     * @param recycle - should file be restarted at EOF?
     * //@param ignoreFirstLine - Ignore first line
     * @return String containing the next line in the file (null if EOF reached and not recycle)
     * @throws IOException when reading of the file fails, or the file was not reserved properly
     */
    public synchronized String readLine(String filename, boolean recycle,String linenum) throws IOException {
        FileEntry fileEntry = files.get(filename);
        String line ="";
        if (fileEntry != null) {
            if (fileEntry.inputOutputObject == null) {
                fileEntry.inputOutputObject = createBufferedReader(fileEntry);
                BufferedReader reader = (BufferedReader) fileEntry.inputOutputObject;
                if(linenum!=""){
                    for(int i=0;i<Integer.parseInt(linenum)-1;i++){
                        reader.readLine();
                    }
                }
            } else if (!(fileEntry.inputOutputObject instanceof Reader)) {
                throw new IOException("File " + filename + " already in use");
            }
            BufferedReader reader = (BufferedReader) fileEntry.inputOutputObject;
            line = reader.readLine();
            if (line == null && recycle) {
                reader.close();
                reader = createBufferedReader(fileEntry);
                fileEntry.inputOutputObject = reader;
                //if (ignoreFirstLine) {
                    // read first line and forget
                  //  reader.readLine();//NOSONAR
                //}
                line = reader.readLine();
            }
            log.debug("Read:{}", line);
            return line;
        }
        throw new IOException("File never reserved: "+filename);
    }

    /**
     *
     * @param alias the file name or alias
     * @param recycle whether the file should be re-started on EOF
    // * @param ignoreFirstLine whether the file contains a file header which will be ignored
     * @param delim the delimiter to use for parsing
     * @return the parsed line, will be empty if the file is at EOF
     * @throws IOException when reading of the aliased file fails, or the file was not reserved properly
     */
    public synchronized String[] getParsedLine(String alias, boolean recycle, String linenum, char delim) throws IOException {
        BufferedReader reader = getReader(alias, recycle, linenum);
        return CSVSaveService.csvReadFile(reader, delim);
    }

    /**
     * Return BufferedReader handling close if EOF reached and recycle is true
     * and ignoring first line if ignoreFirstLine is true
     *
     * @param alias           String alias
     * @param recycle         Recycle at eof
     //* @param ignoreFirstLine Ignore first line
     * @return {@link BufferedReader}
     */
    private BufferedReader getReader(String alias, boolean recycle, String linenum) throws IOException {
        FileEntry fileEntry = files.get(alias);
        if (fileEntry != null) {
            BufferedReader reader;
            if (fileEntry.inputOutputObject == null) {
                reader = createBufferedReader(fileEntry);
                fileEntry.inputOutputObject = reader;
                 if(linenum!=""){
                    for(int i=0;i<Integer.parseInt(linenum)-1;i++){
                        reader.readLine();
                    }
                 }
            } else if (!(fileEntry.inputOutputObject instanceof Reader)) {
                throw new IOException("File " + alias + " already in use");
            } else {
                reader = (BufferedReader) fileEntry.inputOutputObject;
                if (recycle) { // need to check if we are at EOF already
                    reader.mark(1);
                    int peek = reader.read();
                    if (peek == -1) { // already at EOF
                        reader.close();
                        reader = createBufferedReader(fileEntry);
                        fileEntry.inputOutputObject = reader;
                        if(linenum!=""){
                            for(int i=0;i<Integer.parseInt(linenum)-1;i++){
                                reader.readLine();
                            }
                        }
                    } else { // OK, we still have some data, restore it
                        reader.reset();
                    }
                }
            }
            return reader;
        } else {
            throw new IOException("File never reserved: "+alias);
        }
    }

    private BufferedReader createBufferedReader(FileEntry fileEntry) throws IOException {
        if (!fileEntry.file.canRead() || !fileEntry.file.isFile()) {
            throw new IllegalArgumentException("File "+ fileEntry.file.getName()+ " must exist and be readable");
        }
        FileInputStream fis = new FileInputStream(fileEntry.file);
        InputStreamReader isr = null;
        // If file encoding is specified, read using that encoding, otherwise use default platform encoding
        String charsetName = fileEntry.charSetEncoding;
        if(!JOrphanUtils.isBlank(charsetName)) {
            isr = new InputStreamReader(fis, charsetName);
        } else {
            isr = new InputStreamReader(fis);
        }
        return new BufferedReader(isr);
    }

    public synchronized void write(String filename, String value) throws IOException {
        FileEntry fileEntry = files.get(filename);
        if (fileEntry != null) {
            if (fileEntry.inputOutputObject == null) {
                fileEntry.inputOutputObject = createBufferedWriter(fileEntry);
            } else if (!(fileEntry.inputOutputObject instanceof Writer)) {
                throw new IOException("File " + filename + " already in use");
            }
            BufferedWriter writer = (BufferedWriter) fileEntry.inputOutputObject;
            log.debug("Write:{}", value);
            writer.write(value);
        } else {
            throw new IOException("File never reserved: "+filename);
        }
    }

    private BufferedWriter createBufferedWriter(FileEntry fileEntry) throws IOException {
        FileOutputStream fos = new FileOutputStream(fileEntry.file);
        OutputStreamWriter osw;
        // If file encoding is specified, write using that encoding, otherwise use default platform encoding
        String charsetName = fileEntry.charSetEncoding;
        if(!JOrphanUtils.isBlank(charsetName)) {
            osw = new OutputStreamWriter(fos, charsetName);
        } else {
            osw = new OutputStreamWriter(fos);
        }
        return new BufferedWriter(osw);
    }

    public synchronized void closeFiles() throws IOException {
        for (Map.Entry<String, FileEntry> me : files.entrySet()) {
            closeFile(me.getKey(),me.getValue() );
        }
        files.clear();
    }

    /**
     * @param name the name or alias of the file to be closed
     * @throws IOException when closing of the aliased file fails
     */
    public synchronized void closeFile(String name) throws IOException {
        FileEntry fileEntry = files.get(name);
        closeFile(name, fileEntry);
    }

    private void closeFile(String name, FileEntry fileEntry) throws IOException {
        if (fileEntry != null && fileEntry.inputOutputObject != null) {
            log.info("Close: {}", name);
            fileEntry.inputOutputObject.close();
            fileEntry.inputOutputObject = null;
        }
    }

    boolean filesOpen() { // package access for test code only
        return files.values().stream()
                .anyMatch(fileEntry -> fileEntry.inputOutputObject != null);
    }

    /**
     * Method will get a random file in a base directory
     * <p>
     * TODO hey, not sure this method belongs here.
     * FileServer is for thread safe File access relative to current test‘s base directory.
     *
     * @param basedir    name of the directory in which the files can be found
     * @param extensions array of allowed extensions, if <code>null</code> is given,
     *                   any file be allowed
     * @return a random File from the <code>basedir</code> that matches one of
     * the extensions
     */
    public File getRandomFile(String basedir, String[] extensions) {
        File input = null;
        if (basedir != null) {
            File src = new File(basedir);
            File[] lfiles = src.listFiles(new JMeterFileFilter(extensions));
            if (lfiles != null) {
                // lfiles cannot be null as it has been checked before
                int count = lfiles.length;
                input = lfiles[ThreadLocalRandom.current().nextInt(count)];
            }
        }
        return input;
    }

    /**
     * Get {@link File} instance for provided file path,
     * resolve file location relative to base dir or script dir when needed
     *
     * @param path original path to file, maybe relative
     * @return {@link File} instance
     */
    public File getResolvedFile(String path) {
        reserveFile(path);
        return files.get(path).file;
    }

    private static class FileEntry{
        private String headerLine;
        private Throwable exception;
        private final File file;
        private Closeable inputOutputObject;
        private final String charSetEncoding;

        FileEntry(File f, Closeable o, String e) {
            file = f;
            inputOutputObject = o;
            charSetEncoding = e;
        }
    }

    /**
     * Resolve a file name that may be relative to the base directory. If the
     * name begins with the value of the JMeter property
     * "jmeter.save.saveservice.base_prefix" - default "~/" - then the name is
     * assumed to be relative to the basename.
     *
     * @param relativeName
     *            filename that should be checked for
     *            <code>jmeter.save.saveservice.base_prefix</code>
     * @return the updated filename
     */
    public static String resolveBaseRelativeName(String relativeName) {
        if (relativeName.startsWith(BASE_PREFIX)){
            String newName = relativeName.substring(BASE_PREFIX.length());
            return new File(getFileServer().getBaseDir(),newName).getAbsolutePath();
        }
        return relativeName;
    }

    /**
     * @return JMX Script name
     * @since 2.6
     */
    public String getScriptName() {
        return scriptName;
    }

    /**
     * @param scriptName Script name
     * @since 2.6
     */
    public void setScriptName(String scriptName) {
        this.scriptName = scriptName;
    }
}

原文地址：https://www.cnblogs.com/qianjinyan/p/9543879.html