Spring/spring-loaded
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Cache versioning so we can clear it when the format changes automatically.

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Without this the user must manually clear the cache.
This commit is contained in:
Andy Clement
2012-12-11 10:20:38 -08:00
parent 8ff073a398
commit 670cbed24f
1 changed files with 38 additions and 0 deletions
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38
org.springsource.loaded/src/main/java/org/springsource/loaded/MethodInvokerRewriter.java
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@@ -185,7 +185,14 @@ public class MethodInvokerRewriter {
if (cacheDir.exists()) {
recursiveDelete(cacheDir);
}
versionInIndex=false;
}
private static final int CACHE_VERSION_1_1_0=1;
private static final int CACHE_VERSION_1_1_1=2;
private static final int CURRENT_CACHE_VERSION = CACHE_VERSION_1_1_1;
private static boolean versionInIndex = false;
/**
* Load the cache index from the file '<cacheDir>/.index'.
@@ -203,11 +210,25 @@ public class MethodInvokerRewriter {
File cacheIndexFile = new File(cacheDir, ".index");
if (cacheIndexFile.exists()) {
try {
boolean clearCache = false;
int cacheVersion = CACHE_VERSION_1_1_0; // if no version tag, assume 1.1.0
try {
FileReader fr = new FileReader(cacheIndexFile);
BufferedReader br = new BufferedReader(fr);
String line;
boolean handledVersionString = false;
while ((line = br.readLine()) != null) {
if (!handledVersionString) {
if (line.startsWith("Version")) {
int colon = line.indexOf(":");
if (colon!=-1) {
cacheVersion = Integer.parseInt(line.substring(colon+1));
}
handledVersionString = true;
continue;
}
}
StringTokenizer st = new StringTokenizer(line, ":");
boolean changed = st.nextToken().equals("y");
String len = st.nextToken();
@@ -220,6 +241,19 @@ public class MethodInvokerRewriter {
} catch (IOException ioe) {
ioe.printStackTrace();
}
if (cacheVersion!=CURRENT_CACHE_VERSION) {
clearCache=true;
versionInIndex=false;
} else {
versionInIndex=true;
}
if (clearCache) {
if (DEBUG_CACHING) {
System.out.println("SpringLoaded: cache looks old (version "+cacheVersion+") - clearing it");
}
deleteCacheFiles();
anyNecessaryCacheCleanupDone = true;
}
} catch (NoSuchElementException nsme) {
// rogue entry in the cache
if (DEBUG_CACHING) {
@@ -338,6 +372,10 @@ public class MethodInvokerRewriter {
try {
FileWriter fw = new FileWriter(cacheIndexFile, true);
BufferedWriter bw = new BufferedWriter(fw);
if (!versionInIndex) {
versionInIndex = true;
bw.write("Version:"+CURRENT_CACHE_VERSION+"\n");
}
bw.write((changed ? "y" : "n") + ":" + bytes.length + ":" + slashedclassname + "\n");
bw.flush();
fw.close();