Expose JGit repository cache configuration parameters

Allow to configure core.repositoryCacheCleanupDelay and
core.repositoryCacheExpireAfter parameters in gerrit.config.

Change-Id: I8e0d7f0a4154d56759d89c38f9118fd72a7ee953

2 files changed, 32 insertions, 0 deletions

diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index 27c8f0f9fb..a956d522bd 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -1412,6 +1412,33 @@ that are merged have more than one common predecessor.
 +
 Default is true.
 
+[[core.repositoryCacheCleanupDelay]]core.repositoryCacheCleanupDelay::
++
+Delay between each periodic cleanup of expired repositories.
++
+Values can be specified using standard time unit abbreviations (`ms`, `sec`,
+`min`, etc.).
++
+Set it to 0 in order to switch off cache expiration. If cache expiration is
+switched off, the JVM can still evict cache entries when it is running low
+on available heap memory.
++
+Set it to -1 to automatically derive cleanup delay from
+`core.repositoryCacheExpireAfter` (lowest value between 1/10 of
+`core.repositoryCacheExpireAfter` and 10 minutes).
++
+Default is -1.
+
+[[core.repositoryCacheExpireAfter]]core.repositoryCacheExpireAfter::
++
+Time an unused repository should expire and be evicted from the repository
+cache.
++
+Values can be specified using standard time unit abbreviations (`ms`, `sec`,
+`min`, etc.).
++
+Default is 1 hour.
+
 [[database]]
 === Section database
 
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/git/LocalDiskRepositoryManager.java b/gerrit-server/src/main/java/com/google/gerrit/server/git/LocalDiskRepositoryManager.java
index 093d036b23..ad5cf20650 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/git/LocalDiskRepositoryManager.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/git/LocalDiskRepositoryManager.java
@@ -31,6 +31,7 @@ import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.lib.RepositoryCache;
 import org.eclipse.jgit.lib.RepositoryCache.FileKey;
+import org.eclipse.jgit.lib.RepositoryCacheConfig;
 import org.eclipse.jgit.lib.StoredConfig;
 import org.eclipse.jgit.storage.file.WindowCacheConfig;
 import org.eclipse.jgit.util.FS;
@@ -84,6 +85,10 @@ public class LocalDiskRepositoryManager implements GitRepositoryManager,
 
     @Override
     public void start() {
+      RepositoryCacheConfig repoCacheCfg = new RepositoryCacheConfig();
+      repoCacheCfg.fromConfig(serverConfig);
+      repoCacheCfg.install();
+
       WindowCacheConfig cfg = new WindowCacheConfig();
       cfg.fromConfig(serverConfig);
       if (serverConfig.getString("core", null, "streamFileThreshold") == null) {