Really simple little function, but does anyone know how to sleep OS X from Java?
Cheers
System.exec("osascript -e 'tell application \"System Events\" to sleep'");
See: Making Mac OS X sleep from the command line
Create a script with the following:
#!/bin/bash
osascript << EOT
tell application "System Events"
sleep
end
EOT
And use system to exec it.
public void gotoSleep(){
try{
logger.finer("Zzz...");
if (preferences.getOS().equals("OSX") == true ){
Process p = Runtime.getRuntime().exec
("/bin/bash");
String command = "osascript -e 'tell application \"System Events\"' "
+ " -e \"sleep\" -e 'end tell'";
OutputStream stdin = p.getOutputStream();
stdin.write( command.getBytes() );
stdin.flush();
stdin.close();
}
}catch( Exception e ) {
logger.warning( e.toString() );
}
}
For Some reason while i was doing it it did not work without executing it through bash.
Related
I have a Java program where I am triggering a shell scripts.
Java Code Sample is :
ProcessBuilder pb = new ProcessBuilder(cmdList);
p = pb.start();
p.waitFor();
Where cmdList contains all required necessary input argument to execute the shell. This shell script is having a for loop inside and executing some DB scripts in that loop and printing result info & error logs in a file.
Below is sample shell script code :
#!/bin/bash
export PATH=/apps/PostgresPlus/as9.6/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
set -eE
#################################################### START
TIME_ELAPSED=""
TIME_ELAPSED_IN_HOURS=""
SCRIPT_START_TIME_FORMATTED=date '+%F %T'
SCRIPT_START_TIME_IN_SEC=date +%s
PROCESS_LOG_BASE_PATH="/data/logs/purge_log/"
PROCESS_LOG="$PROCESS_LOG_BASE_PATH/purge.log"
trap 'err=$?; logError 2>&1 "Error occurred during purging. Exiting with status $err at line $LINENO: ${BASH_COMMAND}. Please check logs for more info." >>$PROCESS_LOG' ERR
trap 'logError 2>&1 "Error occurred during purging. Exiting shell script execution as an external interrupt was received. Please check logs for more info." >>$PROCESS_LOG; trap ERR' INT
banner()
{
echo "+------------------------------------------------------------------------------------------------+"
printf "|tput bold[ %-40s tput sgr0|\n" "$1 ] tput setaf 2 $2"
echo "+------------------------------------------------------------------------------------------------+"
}
logError()
{
printf "[ProcessId- $$] [date "+%Y-%m-%d %H:%M:%S"] tput setaf 1 tput bold [ERROR] tput setaf 1 %-40s tput sgr0\n" "$#"
}
logInfo(){
printf "[ProcessId- $$] [date "+%Y-%m-%d %H:%M:%S"] tput setaf 6 bold [INFO] %-40s tput sgr0\n" "$#"
}
logWarn(){
printf "[ProcessId- $$] [date "+%Y-%m-%d %H:%M:%S"] tput setaf 3 tput bold [WARNING] %-40s tput sgr0\n" "$#"
}
logHint(){
printf "[ProcessId- $$] [date "+%Y-%m-%d %H:%M:%S"] tput setaf 5 tput sitm %-40s tput sgr0\n" "$#"
}
main()
{
banner "$SCRIPT_START_TIME_FORMATTED" "Started processing" | tee -a $PROCESS_LOG
logInfo "Started execution at $SCRIPT_START_TIME_FORMATTED" | tee -a $PROCESS_LOG
set PGPASSWORD=$DB_PASSWORD
export PGPASSWORD=$DB_PASSWORD
# Call DB function for audit and category wise data purging, population of schema names
SCHEMA_NAMES_RESULT=$(psql -h $HOST_NAME -d $DB_NAME -U $DB_USER -p $DB_PORT -At -c "SELECT $COMMON_SCHEMA_NAME.purge_audit_and_populate_schema_names('$COMMON_SCHEMA_NAME', $PURGE_DATA_INTERVAL_IN_DAYS,'$SCHEMA_NAMES',$NUM_TOP_CONTRIBUTING_TENANTS)")
SCHEMA_NAMES_RESULT=$(echo "$SCHEMA_NAMES_RESULT" | sed 's/{//g; s/}//g; s/"//g' )
SCHEMA_NAMES=$(echo $SCHEMA_NAMES_RESULT | rev | cut -d"," -f2- | rev)
#Convert comma separated string of tenants to array
SCHEMA_NAMES=($(echo "$SCHEMA_NAMES" | tr ',' '\n'))
# loop for multi schema
for element in "${SCHEMA_NAMES[#]}"
do
logInfo "Effective tenant - $element, Script start time - $SCRIPT_START_TIME_FORMATTED" | tee -a $PROCESS_LOG
# PGSQL call to DB function to execute purging
logInfo "Time elapsed since script execution started - $TIME_ELAPSED" | tee -a $PROCESS_LOG
done
#logInfo "Purge completed!" | tee -a $PROCESS_LOG
logInfo "Purge execution completed successfully at `date '+%F %T'`" | tee -a $PROCESS_LOG
exit 0
}
mkdir -p $PROCESS_LOG_BASE_PATH
main "$#"
#################################################### END
Following is my observation with this program.
When running shell script directly on putty it executes properly without any error.
When triggering shell script through above java program the following behavior I observed.
a. It hangs after a certain iteration in for loop.
b. As I reduce the number of logs entries from shell scripts, iteration (for loop) numbers keeps on increasing.
c. When I removed all info logs and keeps on printing only error log then it completed successfully.
Can someone please help in identifying the reason behind this behavior.
For now, I put check on the number of iteration in for loop but that problem can occur any time when I will start receiving multiple error log.
Regards
Kushagra
You have to consume the process streams or map err and out to file so the native buffers don't fill up. It works better if you create threads to consume each stream. The hacky single thread version is something like this:
ProcessBuilder pb = new ProcessBuilder(cmdList);
p = pb.start();
try (InputStream in = p.getInputStream();
InputStream err = p.getErrorStream();
OutputStream closeOnly = p.getOutputStream()) {
while (p.isAlive()) {
long skipped = 0L;
try {
skipped = in.skip(in.available())
+ err.skip(err.available());
} catch (IOException jdk8155808) {
byte[] b = new byte[2048];
int read = in.read(b, 0, Math.min(b.length, in.available());
if (read > 0) {
skipped += read;
}
read = err.read(b, 0, Math.min(b.length, err.available());
if (read > 0) {
skipped += read;
}
}
if(skipped == 0L) {
p.waitFor(5L, TimeUnit.MILLISECONDS);
}
}
} finally {
p.destroy();
}
The thread way works like this:
public void foo() {
class DevNull implements Runnable {
private final InputStream is;
DevNull(final InputStream is) {
is = Objects.requireNonNull(is);
}
public void run() {
byte[] b = new byte[64];
try {
while (is.read(b) >= 0);
} catch(IOException ignore) {
}
}
}
ExecutorService e = Executors.newCachedThreadPool();
ProcessBuilder pb = new ProcessBuilder(cmdList);
Process p = pb.start();
try (InputStream in = p.getInputStream();
InputStream err = p.getErrorStream();
OutputStream closeOnly = p.getOutputStream()) {
e.execute(new DevNull(in));
e.execute(new DevNull(err));
p.waitFor();
} finally {
p.destroy();
e.shutdown();
}
}
Thanks multi threading one worked for me.
For single thread option it got failed on skip().
Thanks again for helping in resolving the issue.
if (args.length == 0&&runningFromIntelliJ()==false) {
String OS = System.getProperty("os.name", "generic").toLowerCase(Locale.ENGLISH);
if (OS.indexOf("win") >= 0) {
String path = CODE.run.class.getProtectionDomain().getCodeSource().getLocation().getPath().substring(1);
String decodedPath = null;
try {
decodedPath = URLDecoder.decode(path, "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
try {
Runtime.getRuntime().exec("cmd"+" /c start java -jar \"" + decodedPath + "\" run");
} catch (IOException e) {
e.printStackTrace();
}
System.exit(0);
}
}
}
This Code is Starting a programm in cmd after i double clicked it. the problem is that it only works in windows And I want to run it on my raspberry pi. The problem now is that I habe no Idea how a can start a .jar with args in xterm.
runningFromIntelliJ() is just testing if I am running the programm in IntelliJ and skips that part if I do.
It seems like your app will do nothing once there's an argument passed to the jar.
if(args.length==0)
will be false hence the whole if. If you have other code to run with Arguments, try this:
java -jar yourJar.jar "arg 1" arg2#
Otherwise, review your code.
Here is one way to start a program with xterm.
xterm -hold -e '/bin/bash -c "ls -l"'
In this example, the program is simply the ls command, but it should be self-explanatory how to use it for java; just use the example found in another answer.
In your java code, what that looks like is:
Runtime.getRuntime().exec(String.format("xterm -hold -e '/bin/bash -c \"%s\"'", "java -jar '" + decodedPath + "' run"));
or without a shell:
Runtime.getRuntime().exec(String.format("xterm -hold -e 'java -jar \"%s\" run'", decodedPath));
I have created the shell script to add two numbers. I want to execute that shell script from java. Can you please help me on this.
first_num=0
second_num=0
echo -n "Enter the first number-->"
read first_num
echo -n "Enter the second number-->"
read second_num
echo "first number + second number = $ (( first_num + second_num ))"
And I need a piece of code based on the "jsch" library
you can do it by getting the runtime, as next
Process p = null;
Runtime rt = Runtime.getRuntime ();
String rutaFinal=path+carpeta+"/";
System.out.println("** Executing command *****");
p = rt.exec("chmod x process.sh");
p = rt.exec ("sh process.sh");
p.waitFor();
Also you can execute commands one by one, hope this help!!!
I wrote a java code to execute Vowpal Wabbit in the following way:
System.out.println("Executing command " + command);
final Runtime r = Runtime.getRuntime();
final Process p = r.exec(command);
System.out.println("waiting for the process");
try (final BufferedReader b = new BufferedReader(new InputStreamReader(p.getInputStream()))) {
String line;
while ((line = b.readLine()) != null) {
final T lineResult = textParser.parseLine(line);
parserResultCombiner.addToCombiner(lineResult);
}
}
p.waitFor();
System.out.println("done");
}
where the command is
vw -d input.txt --loss_function=logistic -f model.vw
The disadvantage of this is that it requires writing to disk. After some searching, I learned that vowpal wabbit supports reading data from standard input
example in R
I could not find any example to accomplish this in Java 1.8. Could anyone share one with me?
You need to start vw in daemon mode. This starts a process that listens on the port specified.
$ vw -i model.vw -t --daemon --quiet --port 26542
Once the daemon has started, you can send samples to predict using socket calls
$ echo " abc-example| a b c" | netcat localhost 26542
0.000000 abc-example
$ echo " xyz-example| x y z" | netcat localhost 26542
1.000000 xyz-example
source:
https://github.com/JohnLangford/vowpal_wabbit/wiki/daemon-example
Recently they pushed a java version of the code that interacts with vw using jni
https://github.com/JohnLangford/vowpal_wabbit/tree/master/java
I have written a shell script for automatic
1) start of hadoop services (namenode,datanode,jobtracker,tasktracker,secondary namenode),
2) dropping all tables from hive
3) again importing all tables in hive from SQL SERVER
And I am calling this shel script from java. Below is the code of Shell Script and Java Code
Shell Script:
export HADOOP_HOME=/home/hadoop/hadoop-0.20.2-cdh3u2/
export HIVE_HOME=/home/hadoop/hive-0.7.1/
export SQOOP_HOME=/home/hadoop/sqoop-1.3.0-cdh3u1/
export MSSQL_CONNECTOR_HOME=/home/hadoop/sqoop-sqlserver-1.0
export HBASE_HOME=/home/hadoop/hbase-0.90.1-cdh3u0
export ZOOKEEPER_HOME=/home/hadoop/zookeeper-3.3.1+10
export SQOOP_CONF_DIR=/home/hadoop/sqoop-1.3.0-cdh3u1/conf/
/home/hadoop/hadoop-0.20.2-cdh3u2/bin/hadoop/start-all.sh
/home/hadoop/hadoop-0.20.2-cdh3u2/bin/hadoop -rmr /user/hadoop/*
/home/hadoop/hive-0.7.1/bin/hive -e 'show tables' > TablesToDelete.txt
while read line1
do
echo 'drop table '$line1
/home/hadoop/hive-0.7.1/bin/hive -e 'drop table '$line1
done < TablesToDelete.txt
while read line
do
echo $line" ------------------------------"
/home/hadoop/sqoop-1.3.0-cdh3u1/bin/sqoop-import --connect 'jdbc:sqlserver://192.168.1.1;username=abcd;password=12345;database=HadoopTest' --table line --hive-table $line --create-hive-table --hive-import -m 1 --hive-drop-import-delims --hive-home /home/hadoop/hive-0.7.1 --verbose
done < /home/hadoop/sqoop-1.3.0-cdh3u1/bin/tables.txt
Java Code:
public class ImportTables
{
public static void main(String arsg[])
{
PrintWriter pw=null;
try
{
Formatter formatter = new Formatter();
String LogFile = "Log-"+ formatter.format("%1$tm%1$td-%1$tH%1$tM%1$tS", new Date());
File f=new File("/home/hadoop/"+LogFile);
FileWriter fw1=null;
pw=new PrintWriter(f);
String cmd = "/home/hadoop/sqoop-1.3.0-cdh3u1/bin/TablesToImport.sh"; // this is the command to execute in the Unix shell
// create a process for the shell
ProcessBuilder pb = new ProcessBuilder("bash", "-c", cmd);
pb.redirectErrorStream(true); // use this to capture messages sent to stderr
Process shell = pb.start();
InputStream shellIn = shell.getInputStream(); // this captures the output from the command
int shellExitStatus = shell.waitFor();
// wait for the shell to finish and get the return code
// at this point you can process the output issued by the command
// for instance, this reads the output and writes it to System.out:
int c;
while ((c = shellIn.read()) != -1)
{
System.out.write(c);
}
// close the stream
shellIn.close();
}
catch(Exception e)
{
e.printStackTrace();
e.printStackTrace(pw);
pw.flush();
System.exit(1);
}
}
}
But as I run the program I see nothiing on the console, and program remains in running mode.
And If I put the following code ion shell script:
/home/hadoop/hive-0.7.1/bin/hive -e 'show tables' > TablesToDelete.txt
while read line1
do
echo 'drop table '$line1
/home/hadoop/hive-0.7.1/bin/hive -e 'drop table '$line1
done < TablesToDelete.txt
Then the output come as:
Cannot find hadoop installation: $HADOOP_HOME must be set or hadoop must be in the path
What is the problem in my program/script? Where and How to set HADOOP_HOME and all that path in my script?
The call to waitFor is a blocking call, just as the name implies. It halts further execution until the process is done. But since your code is also the sink for the process's stdout, the whole thing blocks. Just move the waitFor to after you've processed the script's output.