diff options
Diffstat (limited to 'gerrit-server/src/main/java/com/google/gerrit/server/git/PerThreadRequestScope.java')
-rw-r--r-- | gerrit-server/src/main/java/com/google/gerrit/server/git/PerThreadRequestScope.java | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/git/PerThreadRequestScope.java b/gerrit-server/src/main/java/com/google/gerrit/server/git/PerThreadRequestScope.java new file mode 100644 index 0000000000..057e80d10a --- /dev/null +++ b/gerrit-server/src/main/java/com/google/gerrit/server/git/PerThreadRequestScope.java @@ -0,0 +1,99 @@ +// 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; + } +} |