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CommandLine.java
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Sun, Apr 28, 05:48

CommandLine.java
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/**
* Copyright (c) 2010 Yahoo! Inc. All rights reserved.
* <p>
* Licensed 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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. See accompanying
* LICENSE file.
*/
package com.yahoo.ycsb;
import com.yahoo.ycsb.workloads.CoreWorkload;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;
/**
* A simple command line client to a database, using the appropriate com.yahoo.ycsb.DB implementation.
*/
public final class CommandLine {
private CommandLine() {
//not used
}
public static final String DEFAULT_DB = "com.yahoo.ycsb.BasicDB";
public static void usageMessage() {
System.out.println("YCSB Command Line Client");
System.out.println("Usage: java com.yahoo.ycsb.CommandLine [options]");
System.out.println("Options:");
System.out.println(" -P filename: Specify a property file");
System.out.println(" -p name=value: Specify a property value");
System.out.println(" -db classname: Use a specified DB class (can also set the \"db\" property)");
System.out.println(" -table tablename: Use the table name instead of the default \"" +
CoreWorkload.TABLENAME_PROPERTY_DEFAULT + "\"");
System.out.println();
}
public static void help() {
System.out.println("Commands:");
System.out.println(" read key [field1 field2 ...] - Read a record");
System.out.println(" scan key recordcount [field1 field2 ...] - Scan starting at key");
System.out.println(" insert key name1=value1 [name2=value2 ...] - Insert a new record");
System.out.println(" update key name1=value1 [name2=value2 ...] - Update a record");
System.out.println(" delete key - Delete a record");
System.out.println(" table [tablename] - Get or [set] the name of the table");
System.out.println(" quit - Quit");
}
public static void main(String[] args) {
Properties props = new Properties();
Properties fileprops = new Properties();
parseArguments(args, props, fileprops);
for (Enumeration e = props.propertyNames(); e.hasMoreElements();) {
String prop = (String) e.nextElement();
fileprops.setProperty(prop, props.getProperty(prop));
}
props = fileprops;
System.out.println("YCSB Command Line client");
System.out.println("Type \"help\" for command line help");
System.out.println("Start with \"-help\" for usage info");
String table = props.getProperty(CoreWorkload.TABLENAME_PROPERTY, CoreWorkload.TABLENAME_PROPERTY_DEFAULT);
//create a DB
String dbname = props.getProperty(Client.DB_PROPERTY, DEFAULT_DB);
ClassLoader classLoader = CommandLine.class.getClassLoader();
DB db = null;
try {
Class dbclass = classLoader.loadClass(dbname);
db = (DB) dbclass.newInstance();
} catch (Exception e) {
e.printStackTrace();
System.exit(0);
}
db.setProperties(props);
try {
db.init();
} catch (DBException e) {
e.printStackTrace();
System.exit(0);
}
System.out.println("Connected.");
//main loop
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
for (;;) {
//get user input
System.out.print("> ");
String input = null;
try {
input = br.readLine();
} catch (IOException e) {
e.printStackTrace();
System.exit(1);
}
if (input.compareTo("") == 0) {
continue;
}
if (input.compareTo("help") == 0) {
help();
continue;
}
if (input.compareTo("quit") == 0) {
break;
}
String[] tokens = input.split(" ");
long st = System.currentTimeMillis();
//handle commands
if (tokens[0].compareTo("table") == 0) {
handleTable(tokens, table);
} else if (tokens[0].compareTo("read") == 0) {
handleRead(tokens, table, db);
} else if (tokens[0].compareTo("scan") == 0) {
handleScan(tokens, table, db);
} else if (tokens[0].compareTo("update") == 0) {
handleUpdate(tokens, table, db);
} else if (tokens[0].compareTo("insert") == 0) {
handleInsert(tokens, table, db);
} else if (tokens[0].compareTo("delete") == 0) {
handleDelete(tokens, table, db);
} else {
System.out.println("Error: unknown command \"" + tokens[0] + "\"");
}
System.out.println((System.currentTimeMillis() - st) + " ms");
}
}
private static void parseArguments(String[] args, Properties props, Properties fileprops) {
int argindex = 0;
while ((argindex < args.length) && (args[argindex].startsWith("-"))) {
if ((args[argindex].compareTo("-help") == 0) ||
(args[argindex].compareTo("--help") == 0) ||
(args[argindex].compareTo("-?") == 0) ||
(args[argindex].compareTo("--?") == 0)) {
usageMessage();
System.exit(0);
}
if (args[argindex].compareTo("-db") == 0) {
argindex++;
if (argindex >= args.length) {
usageMessage();
System.exit(0);
}
props.setProperty(Client.DB_PROPERTY, args[argindex]);
argindex++;
} else if (args[argindex].compareTo("-P") == 0) {
argindex++;
if (argindex >= args.length) {
usageMessage();
System.exit(0);
}
String propfile = args[argindex];
argindex++;
Properties myfileprops = new Properties();
try {
myfileprops.load(new FileInputStream(propfile));
} catch (IOException e) {
System.out.println(e.getMessage());
System.exit(0);
}
for (Enumeration e = myfileprops.propertyNames(); e.hasMoreElements();) {
String prop = (String) e.nextElement();
fileprops.setProperty(prop, myfileprops.getProperty(prop));
}
} else if (args[argindex].compareTo("-p") == 0) {
argindex++;
if (argindex >= args.length) {
usageMessage();
System.exit(0);
}
int eq = args[argindex].indexOf('=');
if (eq < 0) {
usageMessage();
System.exit(0);
}
String name = args[argindex].substring(0, eq);
String value = args[argindex].substring(eq + 1);
props.put(name, value);
argindex++;
} else if (args[argindex].compareTo("-table") == 0) {
argindex++;
if (argindex >= args.length) {
usageMessage();
System.exit(0);
}
props.put(CoreWorkload.TABLENAME_PROPERTY, args[argindex]);
argindex++;
} else {
System.out.println("Unknown option " + args[argindex]);
usageMessage();
System.exit(0);
}
if (argindex >= args.length) {
break;
}
}
if (argindex != args.length) {
usageMessage();
System.exit(0);
}
}
private static void handleDelete(String[] tokens, String table, DB db) {
if (tokens.length != 2) {
System.out.println("Error: syntax is \"delete keyname\"");
} else {
Status ret = db.delete(table, tokens[1]);
System.out.println("Return result: " + ret.getName());
}
}
private static void handleInsert(String[] tokens, String table, DB db) {
if (tokens.length < 3) {
System.out.println("Error: syntax is \"insert keyname name1=value1 [name2=value2 ...]\"");
} else {
HashMap<String, ByteIterator> values = new HashMap<>();
for (int i = 2; i < tokens.length; i++) {
String[] nv = tokens[i].split("=");
values.put(nv[0], new StringByteIterator(nv[1]));
}
Status ret = db.insert(table, tokens[1], values);
System.out.println("Result: " + ret.getName());
}
}
private static void handleUpdate(String[] tokens, String table, DB db) {
if (tokens.length < 3) {
System.out.println("Error: syntax is \"update keyname name1=value1 [name2=value2 ...]\"");
} else {
HashMap<String, ByteIterator> values = new HashMap<>();
for (int i = 2; i < tokens.length; i++) {
String[] nv = tokens[i].split("=");
values.put(nv[0], new StringByteIterator(nv[1]));
}
Status ret = db.update(table, tokens[1], values);
System.out.println("Result: " + ret.getName());
}
}
private static void handleScan(String[] tokens, String table, DB db) {
if (tokens.length < 3) {
System.out.println("Error: syntax is \"scan keyname scanlength [field1 field2 ...]\"");
} else {
Set<String> fields = null;
if (tokens.length > 3) {
fields = new HashSet<>();
fields.addAll(Arrays.asList(tokens).subList(3, tokens.length));
}
Vector<HashMap<String, ByteIterator>> results = new Vector<>();
Status ret = db.scan(table, tokens[1], Integer.parseInt(tokens[2]), fields, results);
System.out.println("Result: " + ret.getName());
int record = 0;
if (results.isEmpty()) {
System.out.println("0 records");
} else {
System.out.println("--------------------------------");
}
for (Map<String, ByteIterator> result : results) {
System.out.println("Record " + (record++));
for (Map.Entry<String, ByteIterator> ent : result.entrySet()) {
System.out.println(ent.getKey() + "=" + ent.getValue());
}
System.out.println("--------------------------------");
}
}
}
private static void handleRead(String[] tokens, String table, DB db) {
if (tokens.length == 1) {
System.out.println("Error: syntax is \"read keyname [field1 field2 ...]\"");
} else {
Set<String> fields = null;
if (tokens.length > 2) {
fields = new HashSet<>();
fields.addAll(Arrays.asList(tokens).subList(2, tokens.length));
}
HashMap<String, ByteIterator> result = new HashMap<>();
Status ret = db.read(table, tokens[1], fields, result);
System.out.println("Return code: " + ret.getName());
for (Map.Entry<String, ByteIterator> ent : result.entrySet()) {
System.out.println(ent.getKey() + "=" + ent.getValue());
}
}
}
private static void handleTable(String[] tokens, String table) {
if (tokens.length == 1) {
System.out.println("Using table \"" + table + "\"");
} else if (tokens.length == 2) {
table = tokens[1];
System.out.println("Using table \"" + table + "\"");
} else {
System.out.println("Error: syntax is \"table tablename\"");
}
}
}

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