diff options
Diffstat (limited to 'src/main')
| -rw-r--r-- | src/main/java/com/amazon/carbonado/capability/RemoteProcedure.java | 214 | ||||
| -rw-r--r-- | src/main/java/com/amazon/carbonado/capability/RemoteProcedureCapability.java | 52 |
2 files changed, 266 insertions, 0 deletions
diff --git a/src/main/java/com/amazon/carbonado/capability/RemoteProcedure.java b/src/main/java/com/amazon/carbonado/capability/RemoteProcedure.java new file mode 100644 index 0000000..637d17a --- /dev/null +++ b/src/main/java/com/amazon/carbonado/capability/RemoteProcedure.java @@ -0,0 +1,214 @@ +/*
+ * Copyright 2010 Amazon Technologies, Inc. or its affiliates.
+ * Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
+ * of Amazon Technologies, Inc. or its affiliates. All rights reserved.
+ *
+ * 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.amazon.carbonado.capability;
+
+import java.io.Serializable;
+
+import java.util.Collection;
+
+import com.amazon.carbonado.Cursor;
+import com.amazon.carbonado.Repository;
+import com.amazon.carbonado.RepositoryException;
+
+/**
+ * Defines a remote procedure which can be executed by {@link
+ * RemoteProcedureCapability}. Any data within the procedure instance is
+ * serialized to the remote host, and possibly the class definition
+ * too. Execution might have security restrictions applied.
+ *
+ * <p>The RemoteProcedure instance is Serializable, and so and serializable
+ * parameters can be passed with it. Storables and extra data can be sent
+ * through the {@link Request} object. Any data returned by procedure
+ * implementation must be sent through the {@link Reply} object.
+ *
+ * @param <R> reply object type
+ * @param <D> request data object type
+ * @author Brian S O'Neill
+ */
+public interface RemoteProcedure<R, D> extends Serializable {
+ /**
+ * Request handler for remote procedure implementation.
+ *
+ * @param repo repository as seen by host that procedure is running from
+ * @param request non-null request object
+ * @return false if request is still active when this method returns;
+ * request must eventually be explicitly finished
+ */
+ boolean handleRequest(Repository repo, Request<R, D> request) throws RepositoryException;
+
+ /**
+ * Client-side call into a remote procedure. To avoid leaking resources,
+ * the finish method must be invoked or all reply data be fully read. If an
+ * exception is thrown by a method defined in this interface, resources are
+ * automatically released.
+ *
+ * @param <R> reply object type
+ * @param <D> request data object type
+ * @see RemoteProcedureCapability#beginCall
+ */
+ public static interface Call<R, D> {
+ /**
+ * Send data to the remote procedure.
+ *
+ * @return this Call instance
+ * @throws IllegalArgumentException if data is null
+ * @throws IllegalStateException if a call has been executed
+ */
+ Call<R, D> send(D data) throws RepositoryException;
+
+ /**
+ * Send all data from the given cursor to the remote procedure.
+ *
+ * @return this Call instance
+ * @throws IllegalArgumentException if data is null
+ * @throws IllegalStateException if a call has been executed
+ */
+ Call<R, D> sendAll(Cursor<? extends D> cursor) throws RepositoryException;
+
+ /**
+ * Reset the internal object stream of the call, allowing cached
+ * objects to get freed.
+ *
+ * @return this Call instance
+ * @throws IllegalStateException if a call has been executed
+ */
+ Call<R, D> reset() throws RepositoryException;
+
+ /**
+ * Flushes all the data sent so far. Flush is invoked automatically
+ * when call is executed.
+ */
+ void flush() throws RepositoryException;
+
+ /**
+ * Executes the call and receive a reply. Calling this method does not
+ * block, but methods on the returned Cursor may block waiting for
+ * data.
+ *
+ * @throws IllegalStateException if a call has been executed
+ */
+ Cursor<R> fetchReply() throws RepositoryException;
+
+ /**
+ * Executes the call without expecting a reply. Method blocks waiting
+ * for procedure to finish.
+ *
+ * @throws IllegalStateException if a call has been executed
+ */
+ void execute() throws RepositoryException;
+
+ /**
+ * Executes the call without expecting a reply. Method does not block
+ * waiting for procedure to finish. Asynchronous execution is not
+ * allowed if the current thread is in a transaction. This is because
+ * transaction ownership becomes ambiguous.
+ *
+ * @throws IllegalStateException if a call has been executed or if
+ * current thread is in a transaction
+ */
+ void executeAsync() throws RepositoryException;
+ }
+
+ /**
+ * Request into a remote procedure, as seen by procedure implementation. To
+ * avoid leaking resources, the request or reply object must always be
+ * finished. If an exception is thrown by a method defined in this
+ * interface, resources are automatically released.
+ *
+ * @param <R> reply object type
+ * @param <D> request data object type
+ */
+ public static interface Request<R, D> {
+ /**
+ * Receive data from caller.
+ *
+ * @return null if no more data
+ */
+ D receive() throws RepositoryException;
+
+ /**
+ * Receive all remaining data from caller.
+ *
+ * @param c collection to receive data
+ * @return amount received
+ */
+ int receiveInto(Collection<? super D> c) throws RepositoryException;
+
+ /**
+ * Begin a reply after receiving all data. If no data is expected,
+ * reply can be made without calling receive.
+ *
+ * @throws IllegalStateException if reply was already begun or if
+ * request is finished
+ */
+ Reply<R> beginReply() throws RepositoryException;
+
+ /**
+ * Reply and immediately finish, without sending and data to caller.
+ *
+ * @throws IllegalStateException if a reply was already begun
+ */
+ void finish() throws RepositoryException;
+ }
+
+ /**
+ * Reply from remote procedure implementation. To avoid leaking resources,
+ * the finish method must always be invoked. If an exception is thrown by a
+ * method defined in this interface, resources are automatically released.
+ *
+ * @param <R> reply object type
+ */
+ public static interface Reply<R> {
+ /**
+ * Send reply data to the caller.
+ *
+ * @return this Reply instance
+ * @throws IllegalStateException if reply is finished
+ */
+ Reply<R> send(R data) throws RepositoryException;
+
+ /**
+ * Reply with all data from the given cursor to the caller.
+ *
+ * @return this Reply instance
+ * @throws IllegalStateException if reply is finished
+ */
+ Reply<R> sendAll(Cursor<? extends R> cursor) throws RepositoryException;
+
+ /**
+ * Reset the internal object stream of the reply, allowing cached
+ * objects to get freed.
+ *
+ * @return this Reply instance
+ * @throws IllegalStateException if reply is finished
+ */
+ Reply<R> reset() throws RepositoryException;
+
+ /**
+ * Flushes all the data sent so far. Flush is invoked automatically
+ * when reply is finished.
+ */
+ void flush() throws RepositoryException;
+
+ /**
+ * Finish the reply.
+ */
+ void finish() throws RepositoryException;
+ }
+}
diff --git a/src/main/java/com/amazon/carbonado/capability/RemoteProcedureCapability.java b/src/main/java/com/amazon/carbonado/capability/RemoteProcedureCapability.java new file mode 100644 index 0000000..92e0712 --- /dev/null +++ b/src/main/java/com/amazon/carbonado/capability/RemoteProcedureCapability.java @@ -0,0 +1,52 @@ +/*
+ * Copyright 2010 Amazon Technologies, Inc. or its affiliates.
+ * Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
+ * of Amazon Technologies, Inc. or its affiliates. All rights reserved.
+ *
+ * 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.amazon.carbonado.capability;
+
+import com.amazon.carbonado.RepositoryException;
+
+/**
+ * Capability which allows arbitrary code to run on a remote host and access
+ * its repository. The remote procedure might have security restrictions
+ * applied to it.
+ *
+ * <p>Examples:<pre>
+ * RemoteProcedureCapability cap = ...
+ * Cursor<MyRecord> c1 = cap.beginCall(new CustomQuery<MyRecord>(params)).fetchReply();
+ * ...
+ *
+ * Cursor<InputRecord> c2 = ...
+ * cap.beginCall(new Importer<InputRecord>()).sendAll(c2).finish();
+ * </pre>
+ *
+ * @author Brian S O'Neill
+ * @see RemoteProcedure
+ */
+public interface RemoteProcedureCapability extends Capability {
+ /**
+ * Begins a call to execute the given procedure on a remote host.
+ * Execution commences when the Call object is instructed to do so.
+ *
+ * @param <R> reply object type
+ * @param <D> request data object type
+ * @param proc procedure to execute
+ * @return object for defining the call and receiving a reply
+ */
+ <R, D> RemoteProcedure.Call<R, D> beginCall(RemoteProcedure<R, D> proc)
+ throws RepositoryException;
+}
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