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    • org.gradle.testfixtures.internal.InMemoryIndexedCache Maven / Gradle / Ivy

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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.testfixtures.internal;

import org.gradle.api.Transformer;
import org.gradle.cache.PersistentIndexedCache;
import org.gradle.internal.UncheckedException;
import org.gradle.internal.serialize.InputStreamBackedDecoder;
import org.gradle.internal.serialize.OutputStreamBackedEncoder;
import org.gradle.internal.serialize.Serializer;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * A simple in-memory cache, used by the testing fixtures.
 */
public class InMemoryIndexedCache implements PersistentIndexedCache {
    private final Map entries = new ConcurrentHashMap();
    private final Set producing = new HashSet();
    private final Serializer valueSerializer;

    public InMemoryIndexedCache(Serializer valueSerializer) {
        this.valueSerializer = valueSerializer;
    }

    @Override
    public V get(K key) {
        byte[] serialised = entries.get(key);
        if (serialised == null) {
            return null;
        }
        try {
            ByteArrayInputStream instr = new ByteArrayInputStream(serialised);
            InputStreamBackedDecoder decoder = new InputStreamBackedDecoder(instr);
            return valueSerializer.read(decoder);
        } catch (Exception e) {
            throw UncheckedException.throwAsUncheckedException(e);
        }
    }

    @Override
    public V get(K key, Transformer producer) {
        // Contract is that no more than one thread may be producing entries at the same time
        synchronized (producing) {
            while (!producing.add(key)) {
                try {
                    producing.wait();
                } catch (InterruptedException e) {
                    throw UncheckedException.throwAsUncheckedException(e);
                }
            }
        }
        try {
            if (!entries.containsKey(key)) {
                put(key, producer.transform(key));
            }
            return get(key);
        } finally {
            synchronized (producing) {
                producing.remove(key);
                producing.notifyAll();
            }
        }
    }

    @Override
    public void put(K key, V value) {
        ByteArrayOutputStream outstr = new ByteArrayOutputStream();
        OutputStreamBackedEncoder encoder = new OutputStreamBackedEncoder(outstr);
        try {
            valueSerializer.write(encoder, value);
            encoder.flush();
        } catch (Exception e) {
            throw UncheckedException.throwAsUncheckedException(e);
        }

        entries.put(key, outstr.toByteArray());
    }

    @Override
    public void remove(K key) {
        entries.remove(key);
    }
}
    
    
    
    

    




    
    
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