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package org.apache.lucene.util;
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import java.io.IOException;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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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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* An interface for implementations that support 2-phase commit. You can use
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* {@link TwoPhaseCommitTool} to execute a 2-phase commit algorithm over several
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* {@link TwoPhaseCommit}s.
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* @lucene.experimental
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public interface TwoPhaseCommit {
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* The first stage of a 2-phase commit. Implementations should do as much work
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* as possible in this method, but avoid actual committing changes. If the
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* 2-phase commit fails, {@link #rollback()} is called to discard all changes
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* since last successful commit.
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public void prepareCommit() throws IOException;
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* Like {@link #commit()}, but takes an additional commit data to be included
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* <b>NOTE:</b> some implementations may not support any custom data to be
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* included w/ the commit and may discard it altogether. Consult the actual
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* implementation documentation for verifying if this is supported.
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* @see #prepareCommit()
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public void prepareCommit(Map<String, String> commitData) throws IOException;
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* The second phase of a 2-phase commit. Implementations should ideally do
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* very little work in this method (following {@link #prepareCommit()}, and
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* after it returns, the caller can assume that the changes were successfully
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* committed to the underlying storage.
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public void commit() throws IOException;
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* Like {@link #commit()}, but takes an additional commit data to be included
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* @see #prepareCommit(Map)
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public void commit(Map<String, String> commitData) throws IOException;
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* Discards any changes that have occurred since the last commit. In a 2-phase
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* commit algorithm, where one of the objects failed to {@link #commit()} or
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* {@link #prepareCommit()}, this method is used to roll all other objects
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* back to their previous state.
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public void rollback() throws IOException;