// Copyright (C) 2012 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.util;
import com.google.common.base.Objects;
import com.google.gerrit.common.errors.NotSignedInException;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.IdentifiedUser;
import com.google.inject.AbstractModule;
import com.google.inject.Inject;
import com.google.inject.Module;
import com.google.inject.Provides;
import com.google.inject.ProvisionException;
import com.google.inject.name.Named;
import com.google.inject.name.Names;
import javax.annotation.Nullable;
/**
* ThreadLocalRequestContext manages the current RequestContext using a
* ThreadLocal. When the context is set, the fields exposed by the context
* are considered in scope. Otherwise, the FallbackRequestContext is used.
*/
public class ThreadLocalRequestContext {
private static final String FALLBACK = "FALLBACK";
public static Module module() {
return new AbstractModule() {
@Override
protected void configure() {
bind(ThreadLocalRequestContext.class);
bind(RequestContext.class).annotatedWith(Names.named(FALLBACK))
.to(FallbackRequestContext.class);
}
@Provides
RequestContext provideRequestContext(
@Named(FALLBACK) RequestContext fallback) {
return Objects.firstNonNull(local.get(), fallback);
}
@Provides
CurrentUser provideCurrentUser(RequestContext ctx) {
return ctx.getCurrentUser();
}
@Provides
IdentifiedUser provideCurrentUser(CurrentUser user) {
if (user instanceof IdentifiedUser) {
return (IdentifiedUser) user;
}
throw new ProvisionException(NotSignedInException.MESSAGE,
new NotSignedInException());
}
};
}
private static final ThreadLocal<RequestContext> local =
new ThreadLocal<RequestContext>();
@Inject
ThreadLocalRequestContext() {
}
public RequestContext setContext(@Nullable RequestContext ctx) {
RequestContext old = getContext();
local.set(ctx);
return old;
}
@Nullable
public RequestContext getContext() {
return local.get();
}
}