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SPVBlockStore: lock the store file as early as possible

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This commit is contained in:
Andreas Schildbach 2024-06-29 09:08:07 +02:00
parent ce126353a2
commit 147e479e63
1 changed files with 9 additions and 6 deletions
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15
core/src/main/java/org/bitcoinj/store/SPVBlockStore.java
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@ -117,8 +117,16 @@ public class SPVBlockStore implements BlockStore {
checkArgument(capacity > 0);
try {
boolean exists = file.exists();
// Set up the backing file.
// Set up the backing file, empty if it doesn't exist.
randomAccessFile = new RandomAccessFile(file, "rw");
FileChannel channel = randomAccessFile.getChannel();
// Lock the file.
fileLock = channel.tryLock();
if (fileLock == null)
throw new ChainFileLockedException("Store file is already locked by another process");
// Ensure expected file size, grow if desired.
fileLength = getFileSize(capacity);
if (!exists) {
log.info("Creating new SPV block chain file " + file);
@ -140,11 +148,6 @@ public class SPVBlockStore implements BlockStore {
}
}
FileChannel channel = randomAccessFile.getChannel();
fileLock = channel.tryLock();
if (fileLock == null)
throw new ChainFileLockedException("Store file is already locked by another process");
// Map it into memory read/write. The kernel will take care of flushing writes to disk at the most
// efficient times, which may mean that until the map is deallocated the data on disk is randomly
// inconsistent. However the only process accessing it is us, via this mapping, so our own view will