URI Helper and WebTarget Injector For Linked Docker Services
<dependency>
<groupId>com.airhacks</groupId>
<artifactId>servicelink</artifactId>
<version>[RECENT]</version>
</dependency>A docker container started with a legacy link:
docker run (...) --link something:ping (...)
exposes the "ping" link name as environment variables with
HOST and PORT information (e.g. PING_PORT_8080_TCP_ADDR and PING_PORT_8080_TCP_PORT):
Servicelink extracts the information from the environment entries and makes the information available via Dependency Injection:
@Inject
@LegacyLink(linkName = "ping",portNumber = 8080,path = "/ping/resources/pings/echo/")
WebTarget ping;The link name doesn't have to be set in the annotation and can be derived from the field name. The portNumber defaults to 8080:
@Inject
@LegacyLink(path = "/ping/resources/pings/echo/")
WebTarget ping;The same semantics apply for the injection of links in user-defined networks. Links in user-defined networks do not manifest as environment variables and can be directly used without any additional treatment.
@Inject
@Link(linkName = "ping",portNumber = 8080,path = "/ping/resources/pings/echo/")
WebTarget ping;