Hello,
The target of the code below is to compose one presentation from several slides. The generation of the final presentation takes too much time. Is it a problem with our code or a problem of Aspose.Slides library. Actually, on this level of performance the Aspose.Slides library becomes relatively impossible to use in production.
The code is below and source PPTX’s are here (https://slidedeckdev.blob.core.windows.net/slidedeck/slidedeck/Archive.zip).
package com.luxoft.slidedeck.export.sandbox;
import com.aspose.slides.BlobManagementOptions;
import com.aspose.slides.IBlobManagementOptions;
import com.aspose.slides.LoadOptions;
import com.aspose.slides.Presentation;
import com.aspose.slides.SaveFormat;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.io.ByteStreams;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;
import java.util.List;
import java.util.Objects;
import java.util.Stack;
import java.util.logging.Logger;
public class TestExport {
public static void main(String[] args) throws IOException {
System.out.println("Working...");
new TestExport().run();
}
private final Stack<LocalDateTime> timeLine = new Stack<>();
private final StringBuilder log = new StringBuilder();
public TestExport() {
}
public void run() throws IOException {
byte[] dstPresentationContent = readResource("master.pptx");
List<byte[]> srcPresentationsContent = ImmutableList.of(
readResource("slide1.pptx"),
readResource("slide2.pptx"),
readResource("slide3.pptx"),
readResource("slide4.pptx"),
readResource("slide5.pptx")
);
ByteArrayOutputStream resultOutputStream = new ByteArrayOutputStream((srcPresentationsContent.size() + 1) * 10 * 1024 * 1024);
begin("entire process");
begin("open master");
LoadOptions lo = new LoadOptions();
IBlobManagementOptions bmo = new BlobManagementOptions();
lo.setBlobManagementOptions(bmo);
bmo.setTemporaryFilesAllowed(false);
Presentation dstPresentation = new Presentation(new ByteArrayInputStream(dstPresentationContent), lo);
end("open master");
for (byte[] srcPresentationContent : srcPresentationsContent) {
begin("open slide");
Presentation srcPresentation = new Presentation(new ByteArrayInputStream(srcPresentationContent), lo);
end("open slide");
begin("clone slide");
dstPresentation.getSlides().addClone(srcPresentation.getSlides().get_Item(0));
end("clone slide");
begin("dispose slide");
srcPresentation.dispose();
end("dispose slide");
}
begin("write result");
dstPresentation.save(resultOutputStream, SaveFormat.Pptx);
end("write result");
begin("dispose master");
dstPresentation.dispose();
end("dispose master");
end("entire process");
// TODO write result to file
Preconditions.checkState(timeLine.isEmpty());
Logger.getLogger("com.luxoft.slidedeck.api.controllers.CategoriesController").info(log.toString());
}
private void begin(String actionName) {
LocalDateTime now = LocalDateTime.now();
if (timeLine.isEmpty()) {
log.append("\n");
}
timeLine.push(now);
log.append(String.format("%s started\n", actionName));
}
private void end(String actionName) {
LocalDateTime now = LocalDateTime.now();
LocalDateTime than = timeLine.pop();
log.append(String.format("%s ended took %8.2f seconds\n", actionName, ((float) ChronoUnit.MILLIS.between(than, now)) / 1000));
if (timeLine.isEmpty()) {
log.append("------------------------------\n");
}
}
private byte[] readResource(String name) throws IOException {
InputStream inputStream = getClass().getClassLoader().getResourceAsStream(name);
ByteArrayOutputStream outputStream = new ByteArrayOutputStream(1024 * 1024);
ByteStreams.copy(Objects.requireNonNull(inputStream), outputStream);
return outputStream.toByteArray();
}
}