Apache Safeguard is a library around Fault Tolerance, giving your application resilience in a highly distributed microservices framework. It is designed for use with CDI applications.
In today's microservices runtimes, Fault Tolerance allows an application to handle the situations where another service it is consuming is unavialable.
Fault Tolerance is a broad subject, has multiple areas of support typically found in a framework.
When a given invocation fails, you can declare a Fallback for that method.
Allows method invocations to be bounded to a specific duration. Once that boundary hits, an exception is thrown or a fallback is invoked.
Allows a method to be invoked a number of times, as well as for a given duration.
Allows invocations to a given method as long as it is returning successfully. Based on thresholds defined, when a method begins failing invocations will be blocked. After a duration has passed invocations will begin to attempt again.
A bulkhead throttles concurrent access to a method. The throttling can either by based on a semaphore or a thread pool. Semaphores are invoked on the caller's thread and are not bound by any limit to pending requests. Thread pools are used to invoke the component asynchronously and have a finite amount of waiting invocations.
Apache Safeguard is currently in development. You can use our snapshots from the Apache Snapshots repository. These builds are in no way endorsed.
<repositories> <repository> <id>apache-snapshot-repository</id> <url>http://repository.apache.org/snapshots/</url> <releases> <enabled>false</enabled> </releases> <snapshots> <enabled>true</enabled> </snapshots> </repository> </repositories> <dependencies> <dependency> <artifactId>safeguard-api</artifactId> <groupId>org.apache.geronimo.safeguard</groupId> <version>1.0-SNAPSHOT</version> </dependency> <dependency> <artifactId>safeguard-impl</artifactId> <groupId>org.apache.geronimo.safeguard</groupId> <version>1.0-SNAPSHOT</version> </dependency> </dependencies>
Apache Safeguard implements the MicroProfile Fault Tolerance v1.0 specification