added docs and license headers

ethcore/src/blockchain/update.rs

@@ -0,0 +1,23 @@
+use std::collections::HashSet;
+use util::hash::H256;
+use util::kvdb::DBTransaction;
+use header::BlockNumber;
+use blockchain::block_info::BlockInfo;
+
+/// Block extras update info.
+pub struct ExtrasUpdate {
+	/// Block info.
+	pub info: BlockInfo,
+	/// DB update batch.
+	pub batch: DBTransaction,
+	/// Numbers of blocks to update in block hashes cache.
+	pub block_numbers: HashSet<BlockNumber>,
+	/// Hashes of blocks to update in block details cache.
+	pub block_details_hashes: HashSet<H256>,
+	/// Hashes of receipts to update in block receipts cache.
+	pub block_receipts_hashes: HashSet<H256>,
+	/// Hashes of transactions to update in transactions addresses cache.
+	pub transactions_addresses_hashes: HashSet<H256>,
+	/// Changed blocks bloom location hashes.
+	pub bloom_hashes: HashSet<H256>,
+}