Part four #8
Part four #8
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swsms
requested review from
aaaaaa2493 and
swsms
and removed request for
aaaaaa2493
src/blockchain/Blockchain.java
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| public synchronized Block tail() { | ||
| return blocks.get(blocks.size() - 1); |
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If you want, you may rewrite this code using ReentrantReadWritelock to separate lock for write and read operations.
src/blockchain/Blockchain.java
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| private boolean isValid(Block newBlock) { | ||
| Block tailBlock = blocks.get(blocks.size() - 1); | ||
| if (!newBlock.getHash().startsWith(getPrefix()) || !newBlock.getHashPreviousBlock() |
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Objects.equals(...,...) is better to avoid potential NPE
src/blockchain/Blockchain.java
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| for (int i = 1; i < blocks.size(); i++) { | ||
| Block prev = blocks.get(i - 1); | ||
| Block cur = blocks.get(i); | ||
| if (!cur.getHashPreviousBlock().equals(prev.getHash())) { |
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I think Objects.equals(...) is better here
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| private void adjustComplexity(Block newBlock) { | ||
| if (!withinAcceptable(newBlock)) { |
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It is good idea to encapsulate the condition's logic in a separated method
src/blockchain/data/Message.java
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| public class Message { | ||
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| private String author; |
| private String data; | ||
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| public Block(Integer id, Long minerId, String hashPreviousBlock, String hash, Long timestamp, |
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I think the constructor takes a lot of parameters. You may try to use the Builder pattern or combine some parameters together in a single entity
src/blockchain/Main.java
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| Blockchain<Message> blockchain = new Blockchain<>(persister, | ||
| new PlanMessageFormat()); | ||
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| Thread[] miners = new Thread[NUMBER_OF_MINERS]; |
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Java 8+ way:
List<Thread> miners = Stream
.generate(() -> new Thread(() -> System.out.println("hello")))
.limit(100)
.collect(Collectors.toList());
miners.forEach(Thread::start);
miners.forEach(Thread::interrupt);
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| package blockchain; | |||
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The code looks good and readable. Convenient separation into classes and methods.
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