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@Override
public TempBlockMeta allocateBlock(long userId, long blockId, long blockSize,
BlockStoreLocation location) throws IOException {
StorageDir candidateDir = null;5
long maxFreeBytes = blockSize;6
if (location.equals(BlockStoreLocation.anyTier())) {7
for (StorageTier tier : mMetaManager.getTiers()) {8
for (StorageDir dir : tier.getStorageDirs()) {9
if (dir.getAvailableBytes() >= maxFreeBytes) {10
maxFreeBytes = dir.getAvailableBytes();11
candidateDir = dir;12
}13
}14
}15 16 17
} else if (location.equals(BlockStoreLocation.anyDirInTier(location.tierAlias()))) {
StorageTier tier = mMetaManager.getTier(location.tierAlias());18
for (StorageDir dir : tier.getStorageDirs()) {19
if (dir.getAvailableBytes() >= maxFreeBytes) {20
maxFreeBytes = dir.getAvailableBytes();21
candidateDir = dir;22
}23
}24 25 26 27
}
return candidateDir != null ?
new TempBlockMeta(userId, blockId, blockSize, candidateDir) : null;
}1 2 3 4 5 6
@Override
public TempBlockMeta allocateBlock(long userId, long blockId, long blockSize,
BlockStoreLocation location) throws IOException {
StorageDir candidateDir = null;
if (location.equals(BlockStoreLocation.anyTier())) {
for (StorageTier tier : mMetaManager.getTiers()) {7
candidateDir = getCandidateDirInTier(tier, blockSize);8
if (candidateDir != null) {9
return new TempBlockMeta(userId, blockId, blockSize, candidateDir);10 11 12 13 14
}
}
} else if (location.equals(BlockStoreLocation.anyDirInTier(location.tierAlias()))) {
StorageTier tier = mMetaManager.getTier(location.tierAlias());15
candidateDir = getCandidateDirInTier(tier, blockSize);16 17 18 19
}
return candidateDir != null ?
new TempBlockMeta(userId, blockId, blockSize, candidateDir) : null;
}98
private StorageDir getCandidateDirInTier(StorageTier tier, long blockSize) {99
StorageDir candidateDir = null;100
long maxFreeBytes = blockSize - 1;101
for (StorageDir dir : tier.getStorageDirs()) {102
if (dir.getAvailableBytes() > maxFreeBytes) {103
maxFreeBytes = dir.getAvailableBytes();104
candidateDir = dir;105
}106
}107
return candidateDir;108
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