/**
* Removes a block from this storage dir or throws IOException.
*
* @param blockMeta the meta data of the block
* @throws IOException if no block is found
*/
public void removeBlockMeta(BlockMeta blockMeta) throws IOException {
Preconditions.checkNotNull(blockMeta);
long blockId = blockMeta.getBlockId();
BlockMeta deletedBlockMeta = mBlockIdToBlockMap.remove(blockId);
if (deletedBlockMeta == null) {
throw new IOException("Failed to remove BlockMeta: blockId " + blockId + " not found");
}
reclaimSpace(blockMeta.getBlockSize(), true);
}
/**
* Get evictable bytes for this dir, i.e., the total bytes of total evictable blocks
*
* @return evictable bytes for this dir
*/
public long getEvitableBytes() {
long bytes = 0;
for (BlockMeta blockMeta : mDir.getBlocks()) {
long blockId = blockMeta.getBlockId();
if (mManagerView.isBlockEvictable(blockId)) {
bytes += blockMeta.getBlockSize();
}
}
return bytes;
}
/**
* Get a filtered list of block metadata, for blocks that are neither pinned or being blocked.
*
* @return a list of metadata for all evictable blocks
*/
public List<BlockMeta> getEvictableBlocks() {
List<BlockMeta> filteredList = new ArrayList<BlockMeta>();
for (BlockMeta blockMeta : mDir.getBlocks()) {
long blockId = blockMeta.getBlockId();
if (mManagerView.isBlockEvictable(blockId)) {
filteredList.add(blockMeta);
}
}
return filteredList;
}
/**
* Adds the metadata of a new block into this storage dir or throws IOException.
*
* @param blockMeta the meta data of the block
* @throws IOException if blockId already exists or not enough space
*/
public void addBlockMeta(BlockMeta blockMeta) throws IOException {
Preconditions.checkNotNull(blockMeta);
long blockId = blockMeta.getBlockId();
long blockSize = blockMeta.getBlockSize();
if (getAvailableBytes() < blockSize) {
throw new IOException(
"Failed to add BlockMeta: blockId "
+ blockId
+ " is "
+ blockSize
+ " bytes, but only "
+ getAvailableBytes()
+ " bytes available");
}
if (hasBlockMeta(blockId)) {
throw new IOException("Failed to add BlockMeta: blockId " + blockId + " exists");
}
mBlockIdToBlockMap.put(blockId, blockMeta);
reserveSpace(blockSize, true);
}