What is the pessimistic lock and optimistic lock mechanism of Java

This article mainly explains "what is the pessimistic lock and optimistic lock mechanism of Java". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "what is the pessimistic lock and optimistic lock mechanism of Java?"

1. Brief introduction of locking mechanism

One of the most critical problems in concurrent programming is that multithreading processes the same resource concurrently, and a key solution to prevent conflicts in the use of resources is to lock resources: multi-line program serialization access. Lock is a way to control multiple threads to access shared resources. The lock mechanism allows only one thread task to access shared resources at any given time, realizing synchronous mutual exclusion of thread tasks, which is the most ideal but worst performance way. the mechanism of shared read lock allows many tasks to access resources concurrently.

2. Pessimistic lock

Pessimistic lock always assumes that the data read each time will be modified, so the read data should be locked, with strong resource monopoly and exclusive characteristics, in the whole data processing process, the data will be locked, such as the implementation of the synchronized keyword is a pessimistic mechanism.

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