108 lines
3.5 KiB
Java
108 lines
3.5 KiB
Java
// Copyright (C) 2009 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package com.google.gerrit.httpd.rpc;
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import com.google.gerrit.common.errors.CorruptEntityException;
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import com.google.gerrit.common.errors.NoSuchEntityException;
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import com.google.gerrit.server.project.NoSuchChangeException;
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import com.google.gerrit.server.project.NoSuchProjectException;
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import com.google.gerrit.server.project.NoSuchRefException;
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import com.google.gwt.user.client.rpc.AsyncCallback;
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import com.google.gwtjsonrpc.client.VoidResult;
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import com.google.gwtorm.client.OrmException;
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import java.util.concurrent.Callable;
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/**
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* Base class for RPC service implementations.
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* <p>
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* Typically an RPC service implementation will extend this class and use Guice
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* injection to manage its state. For example:
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*
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* <pre>
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* class Foo extends Handler<Result> {
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* interface Factory {
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* Foo create(... args ...);
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* }
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* @Inject
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* Foo(state, @Assisted args) { ... }
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* Result get() throws Exception { ... }
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* }
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* </pre>
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*
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* @param <T> type of result for {@link AsyncCallback#onSuccess(Object)} if the
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* operation completed successfully.
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*/
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public abstract class Handler<T> implements Callable<T> {
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public static <T> Handler<T> wrap(final Callable<T> r) {
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return new Handler<T>() {
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@Override
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public T call() throws Exception {
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return r.call();
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}
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};
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}
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/**
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* Run the operation and pass the result to the callback.
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*
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* @param callback callback to receive the result of {@link #call()}.
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*/
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public final void to(final AsyncCallback<T> callback) {
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try {
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final T r = call();
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if (r != null) {
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callback.onSuccess(r);
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}
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} catch (NoSuchProjectException e) {
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callback.onFailure(new NoSuchEntityException());
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} catch (NoSuchRefException e) {
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callback.onFailure(new NoSuchEntityException());
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} catch (NoSuchChangeException e) {
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callback.onFailure(new NoSuchEntityException());
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} catch (OrmException e) {
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if (e.getCause() instanceof BaseServiceImplementation.Failure) {
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callback.onFailure(e.getCause().getCause());
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} else if (e.getCause() instanceof CorruptEntityException) {
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callback.onFailure(e.getCause());
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} else if (e.getCause() instanceof NoSuchEntityException) {
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callback.onFailure(e.getCause());
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} else {
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callback.onFailure(e);
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}
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} catch (BaseServiceImplementation.Failure e) {
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callback.onFailure(e.getCause());
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} catch (Exception e) {
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callback.onFailure(e);
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}
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}
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/**
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* Compute the operation result.
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*
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* @return the result of the operation. Return {@link VoidResult#INSTANCE} if
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* there is no meaningful return value for the operation.
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* @throws Exception the operation failed. The caller will log the exception
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* and the stack trace, if it is worth logging on the server side.
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*/
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public abstract T call() throws Exception;
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}
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