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Delayed write to file (experimental)

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This commit is contained in:
snowleo 2013-04-22 23:31:11 +02:00
parent e291633ac8
commit 2588e20140
1 changed files with 89 additions and 28 deletions
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117
Essentials/src/com/earth2me/essentials/EssentialsConf.java
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@ -9,6 +9,9 @@ import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CoderResult;
import java.util.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.bukkit.*;
@ -24,21 +27,27 @@ import org.bukkit.util.Vector;
public class EssentialsConf extends YamlConfiguration
{
private static final Logger LOGGER = Logger.getLogger("Minecraft");
private transient File configFile;
private transient String templateName = null;
private transient Class<?> resourceClass = EssentialsConf.class;
private final File configFile;
private String templateName = null;
private Class<?> resourceClass = EssentialsConf.class;
private static final Charset UTF8 = Charset.forName("UTF-8");
private static final ExecutorService EXECUTOR_SERVICE = Executors.newSingleThreadExecutor();
private final AtomicInteger pendingDiskWrites = new AtomicInteger(0);
public EssentialsConf(final File configFile)
{
super();
this.configFile = configFile;
this.configFile = configFile.getAbsoluteFile();
}
private final byte[] bytebuffer = new byte[1024];
public synchronized void load()
{
configFile = configFile.getAbsoluteFile();
if (pendingDiskWrites.get() != 0)
{
LOGGER.log(Level.INFO, "File " + configFile + " not read, because it's not yet written to disk.");
return;
}
if (!configFile.getParentFile().exists())
{
if (!configFile.getParentFile().mkdirs())
@ -241,13 +250,12 @@ public class EssentialsConf extends YamlConfiguration
@Override
public synchronized void save(final File file) throws IOException
{
//long startTime = System.nanoTime();
if (file == null)
{
throw new IllegalArgumentException("File cannot be null");
}
Files.createParentDirs(file);
final String data = saveToString();
if (data.length() == 0)
@ -255,32 +263,85 @@ public class EssentialsConf extends YamlConfiguration
return;
}
if (!configFile.exists())
pendingDiskWrites.incrementAndGet();
EXECUTOR_SERVICE.submit(new WriteRunner(configFile, data, pendingDiskWrites));
//LOGGER.log(Level.INFO, configFile + " prepared for writing in " + (System.nanoTime() - startTime) + " nsec.");
}
private static class WriteRunner implements Runnable
{
private final File configFile;
private final String data;
private final AtomicInteger pendingDiskWrites;
private WriteRunner(final File configFile, final String data, final AtomicInteger pendingDiskWrites)
{
try
this.configFile = configFile;
this.data = data;
this.pendingDiskWrites = pendingDiskWrites;
}
@Override
public void run()
{
//long startTime = System.nanoTime();
synchronized (configFile)
{
LOGGER.log(Level.INFO, _("creatingEmptyConfig", configFile.toString()));
if (!configFile.createNewFile())
if (pendingDiskWrites.get() > 1)
{
LOGGER.log(Level.SEVERE, _("failedToCreateConfig", configFile.toString()));
// Writes can be skipped, because they are stored in a queue (in the executor).
// Only the last is actually written.
pendingDiskWrites.decrementAndGet();
//LOGGER.log(Level.INFO, configFile + " skipped writing in " + (System.nanoTime() - startTime) + " nsec.");
return;
}
try
{
Files.createParentDirs(configFile);
if (!configFile.exists())
{
try
{
LOGGER.log(Level.INFO, _("creatingEmptyConfig", configFile.toString()));
if (!configFile.createNewFile())
{
LOGGER.log(Level.SEVERE, _("failedToCreateConfig", configFile.toString()));
return;
}
}
catch (IOException ex)
{
LOGGER.log(Level.SEVERE, _("failedToCreateConfig", configFile.toString()), ex);
return;
}
}
final OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(configFile), UTF8);
try
{
writer.write(data);
}
finally
{
writer.close();
}
}
catch (IOException e)
{
LOGGER.log(Level.SEVERE, e.getMessage(), e);
}
finally
{
//LOGGER.log(Level.INFO, configFile + " written to disk in " + (System.nanoTime() - startTime) + " nsec.");
pendingDiskWrites.decrementAndGet();
}
}
catch (IOException ex)
{
LOGGER.log(Level.SEVERE, _("failedToCreateConfig", configFile.toString()), ex);
}
}
final OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(file), UTF8);
try
{
writer.write(data);
}
finally
{
writer.close();
}
}