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pre-process speed: read pbf while it is written

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This commit is contained in:
Arndt Brenschede 2019-09-28 13:00:46 +02:00
parent 98b3f62efb
commit e30ea90c0e
1 changed files with 38 additions and 0 deletions
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38
misc/pbfparser/OsmParser.java
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@ -33,13 +33,49 @@ public class OsmParser extends MapCreatorBase
// once more for testing
int rawBlobCount = 0;
long bytesRead = 0L;
// wait for file to become available
while( !mapFile.exists() )
{
System.out.println( "--- waiting for " + mapFile + " to become available" );
Thread.sleep( 10000 );
}
long currentSize = mapFile.length();
long currentSizeTime = System.currentTimeMillis();
DataInputStream dis = new DataInputStream( new BufferedInputStream ( new FileInputStream( mapFile ) ) );
for(;;)
{
// continue reading if either more then a 100 MB unread, or the current-size is known for more then 2 Minutes
while ( currentSize-bytesRead < 100000000L )
{
long newSize = mapFile.length();
if ( newSize != currentSize )
{
currentSize = newSize;
currentSizeTime = System.currentTimeMillis();
}
else if ( System.currentTimeMillis() - currentSizeTime > 120000 )
{
break;
}
if ( currentSize-bytesRead < 100000000L )
{
System.out.println( "--- waiting for more data, currentSize=" + currentSize + " bytesRead=" + bytesRead );
Thread.sleep( 10000 );
}
}
int headerLength;
try
{
headerLength = dis.readInt();
bytesRead += 4;
}
catch (EOFException e)
{
@ -48,10 +84,12 @@ public class OsmParser extends MapCreatorBase
byte[] headerBuffer = new byte[headerLength];
dis.readFully(headerBuffer);
bytesRead += headerLength;
Fileformat.BlobHeader blobHeader = Fileformat.BlobHeader.parseFrom(headerBuffer);
byte[] blobData = new byte[blobHeader.getDatasize()];
dis.readFully(blobData);
bytesRead += blobData.length;
new BPbfBlobDecoder( blobHeader.getType(), blobData, this ).process();