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Iteration over a ListStore in Java Gxt


Iteration over a ListStore in Java Gxt

By : Duncan
Date : November 22 2020, 10:31 AM
should help you out As the javadoc shows List Store does not implement Iterable. So you cannot iterate over it using a for each loop.
Just use the getAll() method of List Store which returns you a java.util.List which properly implements Iterable.
code :
public void cycle(ListStore<String> line_data){

    List<String> lineListData = line_data.getAll();

    //for(LineObject line: lineListData){ <-- won't work since you are using Strings

    for(String line: lineListData){ // <-- this will work but probably not what you want
          //Other code goes here
    }

}
public void cycle(ListStore<LineObject> line_data){

    List<LineObject> lineListData = line_data.getAll();

    for(LineObject line: lineListData){
          //Other code goes here
    }

}


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java: ResultSet iteration vs List iteration : Is there a performance difference

java: ResultSet iteration vs List iteration : Is there a performance difference


By : user2104479
Date : March 29 2020, 07:55 AM
around this issue That is dependent on:
Hibernate version DBMS and version JDBC driver and version
code :
PreparedStatement stmt = con.prepareStatement(sql,
                                              ResultSet.TYPE_FORWARD_ONLY,
                                              ResultSet.CONCUR_READ_ONLY);
Kill the function in one iteration and proceed to the next iteration after X seconds in Java

Kill the function in one iteration and proceed to the next iteration after X seconds in Java


By : user3474840
Date : March 29 2020, 07:55 AM
will help you How to skip or kill a function in one iteration if it takes too long, and then proceed to the next iteration? , You could do something like:
code :
    final ExecutorService executorService = Executors.newSingleThreadExecutor();
    Future<?> future = null;
    try {
        future = executorService.submit(() -> {
            lookup(word);
        });
        future.get(2, TimeUnit.SECONDS);
    }catch(Exception e){
        if(future != null){
            future.cancel(true);
        }
        slowWordSet.add(word);     
    }
Java 8 - External Iteration performing better than Internal Iteration?

Java 8 - External Iteration performing better than Internal Iteration?


By : jabol240
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Even though the presented results are completely irrelevant, the observed effect actually takes place: the Stream API do has an overhead which for such simple tasks cannot be totally eliminated in real applications even after warm-up. Let's write a JMH benchmark:
code :
@Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
@Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@Fork(3)
@State(Scope.Benchmark)
public class IterativeSum {
    @Param({ "100", "10000", "1000000" })
    private int n;

    public static long iterativeSum(long n) {
        long sum = 0;

        for(long i=1; i<=n; i++) {
            sum+=i;
        }
        return sum;
    }

    @Benchmark
    public long is() {
        return iterativeSum(n);
    }
}
Benchmark             (n)  Mode  Cnt     Score     Error  Units
IterativeSum.is       100  avgt   30     0.074 ±   0.001  us/op
IterativeSum.is     10000  avgt   30     6.361 ±   0.009  us/op
IterativeSum.is   1000000  avgt   30   688.527 ±   0.910  us/op
public static long sequentialSumBoxed(long n) {
    return Stream.iterate(1L, i -> i+1).limit(n)
                 .reduce(0L, (i,j) -> i+j);
}

@Benchmark
public long ssb() {
    return sequentialSumBoxed(n);
}
Benchmark             (n)  Mode  Cnt     Score     Error  Units
IterativeSum.ssb      100  avgt   30     1.253 ±   0.084  us/op
IterativeSum.ssb    10000  avgt   30   134.959 ±   0.421  us/op
IterativeSum.ssb  1000000  avgt   30  9119.422 ±  22.817  us/op
public static long sequentialSum(long n) {
    return LongStream.iterate(1L, i -> i+1).limit(n)
                     .reduce(0L, (i,j) -> i+j);
}

@Benchmark
public long ss() {
    return sequentialSum(n);
}
Benchmark             (n)  Mode  Cnt     Score     Error  Units
IterativeSum.ss       100  avgt   30     0.661 ±   0.001  us/op
IterativeSum.ss     10000  avgt   30    67.498 ±   5.732  us/op
IterativeSum.ss   1000000  avgt   30  1982.687 ±  38.501  us/op
public static long rangeSum(long n) {
    return LongStream.rangeClosed(1, n).sum();
}

@Benchmark
public long rs() {
    return rangeSum(n);
}
Benchmark             (n)  Mode  Cnt     Score     Error  Units
IterativeSum.rs       100  avgt   30     0.316 ±   0.001  us/op
IterativeSum.rs     10000  avgt   30    28.646 ±   0.065  us/op
IterativeSum.rs   1000000  avgt   30  2158.962 ± 514.780  us/op
Benchmark             (n)  Mode  Cnt     Score     Error  Units
IterativeSum.rs       100  avgt   30     0.111 ±   0.001  us/op
IterativeSum.rs     10000  avgt   30     9.552 ±   0.017  us/op
IterativeSum.rs   1000000  avgt   30   729.935 ±  31.915  us/op
How can i skip a second iteration if the first iteration (for) is true? [java]

How can i skip a second iteration if the first iteration (for) is true? [java]


By : rtupling
Date : March 29 2020, 07:55 AM
I wish this help you You could use a boolean and only execute the second for loop if it's true...
How to add ListStore inside ListStore in Rust's gtk-rs bindings?

How to add ListStore inside ListStore in Rust's gtk-rs bindings?


By : reempe
Date : March 29 2020, 07:55 AM
help you fix your problem Type problems
If you want to store a gtk::ListStore in another gtk::ListStore, you don't specify gtk::Type::Pointer, you'll need to make use of the last variant, gtk::Type::Other(usize). You can get the type of gtk::ListStore with ToValue::to_value_type at runtime. I sadly could not find a method to do this at compile-time as the type number changes.
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