You're reading from Blockchain with Hyperledger Fabric Build decentralized applications using Hyperledger Fabric 2

Product type Paperback

Published in Nov 2020

Publisher Packt

ISBN-13 9781839218750

Length 756 pages

Edition 2nd Edition

Languages

Java

Tools

Blockchain

Concepts

Blockchain

Authors (7):

Salman A. Baset

Venkatraman Ramakrishna

Salman Baset

Anthony O'Dowd

Petr Novotny

Nitin Gaur

Luc Desrosiers

+3 more

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Table of Contents (18) Chapters

Preface

1. Blockchain – An Enterprise and Industry Perspective

2. Exploring Hyperledger Fabric FREE CHAPTER

3. Business Networks

4. Setting the Stage with a Business Scenario

5. Designing Smart Contract Transactions and Ledger Data Structures

6. Developing Smart Contracts

7. Developing Applications

8. Advanced Topics for Developing Smart Contracts and Applications

9. Network Operation and Distributed Application Building

10. Enterprise Design Patterns and Considerations

11. Agility in a Blockchain Network

12. Governance – A Necessary Evil of Regulated Industries

13. Life in a Blockchain Network

14. Hyperledger Fabric Security

15. Blockchain's Future, Protocol Commercialization, and Challenges Ahead

16. Another Book You May Enjoy

17. Index

Transaction mechanisms

In the following two sections, we will discuss the two key transaction mechanisms related to contract design and implementation, specifically the ReadSet and WriteSet structures used to record information into transactions and the multiversion concurrency control used to ensure consistency between transactions.

The ReadSet and WriteSet

On receipt of a transaction invocation message from a client, the endorsing peer executes a transaction. The execution invokes the contract in the context of the peer's Worldstate and records all reads and writes of its data on the ledger into a ReadSet and WriteSet.

The transaction's WriteSet contains a list of key and value pairs that were modified during the execution by the contract. When the value of a key is modified by a putState function (that is, a new key and value are recorded or an existing key is updated with a new value), the WriteSet will contain the updated key and value pair.

When a...