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/*
 * Copyright 2011 the original author or authors.
 *
 * 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 org.gradle.cache;

import org.gradle.internal.serialize.Serializer;

import java.io.Closeable;
import java.io.File;

/**
 * Represents a directory that can be used for caching.
 *
 * By default, a shared lock is held on this cache by this process, to prevent it being removed or rebuilt by another process
 * while it is in use. You can change this use {@link CacheBuilder#withLockOptions(LockOptions)}.
 *
 * 
You can use {@link CacheBuilder#withInitializer(org.gradle.api.Action)} to provide an action to initialize the contents
 * of the cache, for building a read-only cache. An exclusive lock is held by this process while the initializer is running.
 *
 * You can also use {@link #useCache(org.gradle.internal.Factory)} to perform some action on the cache while holding an exclusive
 * lock on the cache.
 * 
 */
public interface PersistentCache extends CacheAccess, Closeable, CleanableStore {
    /**
     * Returns the base directory for this cache.
     */
    @Override
    File getBaseDir();

    /**
     * Creates an indexed cache implementation that is contained within this cache. This method may be used at any time.
     *
     * The returned cache may only be used by an action being run from {@link #useCache(org.gradle.internal.Factory)}.
     * In this instance, an exclusive lock will be held on the cache.
     *
     */
     PersistentIndexedCache createCache(PersistentIndexedCacheParameters parameters);

    /**
     * Creates an indexed cache implementation that is contained within this store. This method may be used at any time.
     *
     * The returned cache may only be used by an action being run from {@link #useCache(org.gradle.internal.Factory)}.
     * In this instance, an exclusive lock will be held on the cache.
     *
     */
     PersistentIndexedCache createCache(String name, Class keyType, Serializer valueSerializer);

     boolean cacheExists(PersistentIndexedCacheParameters parameters);

    /**
     * Closes this cache, blocking until all operations are complete.
     */
    @Override
    void close();
}