io.apigee.trireme.core

Interface ClassCache

All Known Implementing Classes:

SoftClassCache

public interface ClassCache

This interface describes a generic cache for compiled JavaScript classes. It may be attached to the NodeEnvironment so that multiple scripts in the same JVM can share the same set of compiled JavaScript code. This saves on memory in an environment where many JavaScript methods share the same JVM. Since Node.js applications tend to have many hundreds of JavaScript files required when they execute, and since each one compiles to bytecode, large Trireme installations may use a lot of PermGen space. This cache helps reduce that.

Method Summary

Methods

Modifier and Type	Method and Description
org.mozilla.javascript.Script	getCachedScript(String key) Return a cached copy of the script, or null if the object is not in the cache.
void	putCachedScript(String key, org.mozilla.javascript.Script script) Store the compiled script in the cache.

Method Detail

getCachedScript

org.mozilla.javascript.Script getCachedScript(String key)

Return a cached copy of the script, or null if the object is not in the cache. The implementation will be invoked simultaneously from multiple threads, possibly with the same key.

putCachedScript

void putCachedScript(String key,
                   org.mozilla.javascript.Script script)

Store the compiled script in the cache. Since a compiled Script is supposed to be immutable, there is no need to make a copy. The implementation will be invoked simultaneously from multiple threads, possibly with the same key.