DefaultBackingStoreSupplier.java
- /*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You 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 org.apache.commons.compress.archivers.zip;
- import java.io.IOException;
- import java.nio.file.Files;
- import java.nio.file.Path;
- import java.util.concurrent.atomic.AtomicInteger;
- import org.apache.commons.compress.parallel.FileBasedScatterGatherBackingStore;
- import org.apache.commons.compress.parallel.ScatterGatherBackingStore;
- import org.apache.commons.compress.parallel.ScatterGatherBackingStoreSupplier;
- /**
- * Implements {@link ScatterGatherBackingStoreSupplier} using a temporary folder.
- * <p>
- * For example:
- * </p>
- *
- * <pre>
- * final Path dir = Paths.get("target/custom-temp-dir");
- * Files.createDirectories(dir);
- * final ParallelScatterZipCreator zipCreator = new ParallelScatterZipCreator(Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors()),
- * new DefaultBackingStoreSupplier(dir));
- * </pre>
- *
- * @since 1.23
- */
- public class DefaultBackingStoreSupplier implements ScatterGatherBackingStoreSupplier {
- private static final String PREFIX = "parallelscatter";
- private final AtomicInteger storeNum = new AtomicInteger();
- private final Path dir;
- /**
- * Constructs a new instance. If {@code dir} is null, then use the default temporary-file directory.
- *
- * @param dir temporary folder, may be null, must exist if non-null.
- */
- public DefaultBackingStoreSupplier(final Path dir) {
- this.dir = dir;
- }
- @Override
- public ScatterGatherBackingStore get() throws IOException {
- final String suffix = "n" + storeNum.incrementAndGet();
- final Path tempFile = dir == null ? Files.createTempFile(PREFIX, suffix) : Files.createTempFile(dir, PREFIX, suffix);
- return new FileBasedScatterGatherBackingStore(tempFile);
- }
- }