Line data    Source code

       1             : // Copyright (C) 2012 The Android Open Source Project
       2             : //
       3             : // Licensed under the Apache License, Version 2.0 (the "License");
       4             : // you may not use this file except in compliance with the License.
       5             : // You may obtain a copy of the License at
       6             : //
       7             : // http://www.apache.org/licenses/LICENSE-2.0
       8             : //
       9             : // Unless required by applicable law or agreed to in writing, software
      10             : // distributed under the License is distributed on an "AS IS" BASIS,
      11             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             : // See the License for the specific language governing permissions and
      13             : // limitations under the License.
      14             : 
      15             : package com.google.gerrit.server.util;
      16             : 
      17             : import com.google.common.base.MoreObjects;
      18             : import com.google.gerrit.common.Nullable;
      19             : import com.google.gerrit.exceptions.NotSignedInException;
      20             : import com.google.gerrit.server.CurrentUser;
      21             : import com.google.gerrit.server.IdentifiedUser;
      22             : import com.google.inject.AbstractModule;
      23             : import com.google.inject.Inject;
      24             : import com.google.inject.Module;
      25             : import com.google.inject.Provides;
      26             : import com.google.inject.ProvisionException;
      27             : import com.google.inject.name.Named;
      28             : import com.google.inject.name.Names;
      29             : 
      30             : /**
      31             :  * ThreadLocalRequestContext manages the current RequestContext using a ThreadLocal. When the
      32             :  * context is set, the fields exposed by the context are considered in scope. Otherwise, the
      33             :  * FallbackRequestContext is used.
      34             :  */
      35             : public class ThreadLocalRequestContext {
      36             :   private static final String FALLBACK = "FALLBACK";
      37             : 
      38             :   public static Module module() {
      39         152 :     return new AbstractModule() {
      40             :       @Override
      41             :       protected void configure() {
      42         152 :         bind(ThreadLocalRequestContext.class);
      43         152 :         bind(RequestContext.class)
      44         152 :             .annotatedWith(Names.named(FALLBACK))
      45         152 :             .to(FallbackRequestContext.class);
      46         152 :       }
      47             : 
      48             :       @Provides
      49             :       RequestContext provideRequestContext(@Named(FALLBACK) RequestContext fallback) {
      50         150 :         return MoreObjects.firstNonNull(local.get(), fallback);
      51             :       }
      52             : 
      53             :       @Provides
      54             :       CurrentUser provideCurrentUser(RequestContext ctx) {
      55         150 :         return ctx.getUser();
      56             :       }
      57             : 
      58             :       @Provides
      59             :       IdentifiedUser provideCurrentUser(CurrentUser user) {
      60         149 :         if (user.isIdentifiedUser()) {
      61         149 :           return user.asIdentifiedUser();
      62             :         }
      63           0 :         throw new ProvisionException(NotSignedInException.MESSAGE, new NotSignedInException());
      64             :       }
      65             :     };
      66             :   }
      67             : 
      68         152 :   private static final ThreadLocal<RequestContext> local = new ThreadLocal<>();
      69             : 
      70             :   @Inject
      71         152 :   ThreadLocalRequestContext() {}
      72             : 
      73             :   public RequestContext setContext(@Nullable RequestContext ctx) {
      74         151 :     RequestContext old = getContext();
      75         151 :     local.set(ctx);
      76         151 :     return old;
      77             :   }
      78             : 
      79             :   @Nullable
      80             :   public RequestContext getContext() {
      81         151 :     return local.get();
      82             :   }
      83             : }