Rewrite our build as modular maven components

This refactoring splits the code up into different components, with
their own per-component CLASSPATH.  By moving all of our classes
into isolated components we can better isolate the classpaths and
try to avoid unexpected dependency problems.  It also allows us to
more clearly define which components are used by the GWT UI and
thus must be compiled under GWT, and which components are run on
the server and can therefore use more of the J2SE API.

Change-Id: I833cc22bacc5655d1c9099ed7c2b0e0a5b08855a
Signed-off-by: Shawn O. Pearce <sop@google.com>

gerrit-server/src/main/java/com/google/gerrit/server/project/ProjectCacheImpl.java

@@ -0,0 +1,119 @@
+// Copyright (C) 2008 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.project;
+
+import com.google.gerrit.reviewdb.Project;
+import com.google.gerrit.reviewdb.ProjectRight;
+import com.google.gerrit.reviewdb.ReviewDb;
+import com.google.gerrit.server.cache.Cache;
+import com.google.gerrit.server.cache.CacheModule;
+import com.google.gerrit.server.cache.SelfPopulatingCache;
+import com.google.gerrit.server.config.WildProjectName;
+import com.google.gwtorm.client.OrmException;
+import com.google.gwtorm.client.SchemaFactory;
+import com.google.inject.Inject;
+import com.google.inject.Module;
+import com.google.inject.Singleton;
+import com.google.inject.TypeLiteral;
+import com.google.inject.name.Named;
+
+import java.util.Collection;
+import java.util.Collections;
+
+/** Cache of project information, including access rights. */
+@Singleton
+public class ProjectCacheImpl implements ProjectCache {
+  private static final String CACHE_NAME = "projects";
+
+  public static Module module() {
+    return new CacheModule() {
+      @Override
+      protected void configure() {
+        final TypeLiteral<Cache<Project.NameKey, ProjectState>> type =
+            new TypeLiteral<Cache<Project.NameKey, ProjectState>>() {};
+        core(type, CACHE_NAME);
+        bind(ProjectCacheImpl.class);
+        bind(ProjectCache.class).to(ProjectCacheImpl.class);
+      }
+    };
+  }
+
+  private final ProjectState.Factory projectStateFactory;
+  private final Project.NameKey wildProject;
+  private final ProjectState.InheritedRights inheritedRights;
+  private final SchemaFactory<ReviewDb> schema;
+  private final SelfPopulatingCache<Project.NameKey, ProjectState> byName;
+
+  @Inject
+  ProjectCacheImpl(final ProjectState.Factory psf,
+      final SchemaFactory<ReviewDb> sf,
+      @WildProjectName final Project.NameKey wp,
+      @Named(CACHE_NAME) final Cache<Project.NameKey, ProjectState> byName) {
+    projectStateFactory = psf;
+    schema = sf;
+    wildProject = wp;
+
+    this.byName =
+        new SelfPopulatingCache<Project.NameKey, ProjectState>(byName) {
+          @Override
+          public ProjectState createEntry(final Project.NameKey key)
+              throws Exception {
+            return lookup(key);
+          }
+        };
+
+    this.inheritedRights = new ProjectState.InheritedRights() {
+      @Override
+      public Collection<ProjectRight> get() {
+        return ProjectCacheImpl.this.get(wildProject).getLocalRights();
+      }
+    };
+  }
+
+  private ProjectState lookup(final Project.NameKey key) throws OrmException {
+    final ReviewDb db = schema.open();
+    try {
+      final Project p = db.projects().get(key);
+      if (p == null) {
+        return null;
+      }
+
+      final Collection<ProjectRight> rights =
+          Collections.unmodifiableCollection(db.projectRights().byProject(
+              p.getNameKey()).toList());
+
+      return projectStateFactory.create(p, rights, inheritedRights);
+    } finally {
+      db.close();
+    }
+  }
+
+  /**
+   * Get the cached data for a project by its unique name.
+   *
+   * @param projectName name of the project.
+   * @return the cached data; null if no such project exists.
+   */
+  public ProjectState get(final Project.NameKey projectName) {
+    return byName.get(projectName);
+  }
+
+  /** Invalidate the cached information about the given project. */
+  public void evict(final Project p) {
+    if (p != null) {
+      byName.remove(p.getNameKey());
+    }
+  }
+}