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// Copyright (C) 2009 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.git;
import com.google.gerrit.server.RequestCleanup;
import com.google.gerrit.server.util.ThreadLocalRequestScopePropagator;
import com.google.inject.Key;
import com.google.inject.OutOfScopeException;
import com.google.inject.Provider;
import com.google.inject.Scope;
import java.util.HashMap;
import java.util.Map;
class PerThreadRequestScope {
static class Propagator
extends ThreadLocalRequestScopePropagator<PerThreadRequestScope> {
Propagator() {
super(REQUEST, current);
}
@Override
protected PerThreadRequestScope continuingContext(
PerThreadRequestScope ctx) {
return new PerThreadRequestScope();
}
}
private static final ThreadLocal<PerThreadRequestScope> current =
new ThreadLocal<PerThreadRequestScope>();
private static PerThreadRequestScope requireContext() {
final PerThreadRequestScope ctx = current.get();
if (ctx == null) {
throw new OutOfScopeException("Not in command/request");
}
return ctx;
}
static PerThreadRequestScope set(PerThreadRequestScope ctx) {
PerThreadRequestScope old = current.get();
current.set(ctx);
return old;
}
static final Scope REQUEST = new Scope() {
public <T> Provider<T> scope(final Key<T> key, final Provider<T> creator) {
return new Provider<T>() {
public T get() {
return requireContext().get(key, creator);
}
@Override
public String toString() {
return String.format("%s[%s]", creator, REQUEST);
}
};
}
@Override
public String toString() {
return "PerThreadRequestScope.REQUEST";
}
};
private static final Key<RequestCleanup> RC_KEY =
Key.get(RequestCleanup.class);
final RequestCleanup cleanup;
private final Map<Key<?>, Object> map;
PerThreadRequestScope() {
cleanup = new RequestCleanup();
map = new HashMap<Key<?>, Object>();
map.put(RC_KEY, cleanup);
}
synchronized <T> T get(Key<T> key, Provider<T> creator) {
@SuppressWarnings("unchecked")
T t = (T) map.get(key);
if (t == null) {
t = creator.get();
map.put(key, t);
}
return t;
}
}
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