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package org.apache.lucene.store;
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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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import java.io.IOException;
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* <p>Base class for Locking implementation. {@link Directory} uses
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* instances of this class to implement locking.</p>
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* <p>Note that there are some useful tools to verify that
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* your LockFactory is working correctly: {@link
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* VerifyingLockFactory}, {@link LockStressTest}, {@link
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* LockVerifyServer}.</p>
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* @see LockVerifyServer
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* @see VerifyingLockFactory
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public abstract class LockFactory {
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protected String lockPrefix = null;
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* Set the prefix in use for all locks created in this
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* LockFactory. This is normally called once, when a
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* Directory gets this LockFactory instance. However, you
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* can also call this (after this instance is assigned to
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* a Directory) to override the prefix in use. This
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* is helpful if you're running Lucene on machines that
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* have different mount points for the same shared
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public void setLockPrefix(String lockPrefix) {
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this.lockPrefix = lockPrefix;
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* Get the prefix in use for all locks created in this LockFactory.
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public String getLockPrefix() {
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return this.lockPrefix;
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* Return a new Lock instance identified by lockName.
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* @param lockName name of the lock to be created.
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public abstract Lock makeLock(String lockName);
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* Attempt to clear (forcefully unlock and remove) the
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* specified lock. Only call this at a time when you are
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* certain this lock is no longer in use.
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* @param lockName name of the lock to be cleared.
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abstract public void clearLock(String lockName) throws IOException;