org.apache.james.blob.memory.MemoryBlobStore.java Source code

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Here is the source code for org.apache.james.blob.memory.MemoryBlobStore.java

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package org.apache.james.blob.memory;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.commons.io.IOUtils;
import org.apache.james.blob.api.BlobId;
import org.apache.james.blob.api.BlobStore;
import org.apache.james.blob.api.ObjectStoreException;
import org.apache.james.util.CompletableFutureUtil;

import com.google.common.base.Preconditions;

public class MemoryBlobStore implements BlobStore {
    private final ConcurrentHashMap<BlobId, byte[]> blobs;
    private final BlobId.Factory factory;

    public MemoryBlobStore(BlobId.Factory factory) {
        this.factory = factory;
        blobs = new ConcurrentHashMap<>();
    }

    @Override
    public CompletableFuture<BlobId> save(byte[] data) {
        Preconditions.checkNotNull(data);
        BlobId blobId = factory.forPayload(data);

        blobs.put(blobId, data);

        return CompletableFuture.completedFuture(blobId);
    }

    @Override
    public CompletableFuture<BlobId> save(InputStream data) {
        Preconditions.checkNotNull(data);
        try {
            byte[] bytes = IOUtils.toByteArray(data);
            return save(bytes);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public CompletableFuture<byte[]> readBytes(BlobId blobId) {
        try {
            return CompletableFuture.completedFuture(retrieveStoredValue(blobId));
        } catch (ObjectStoreException e) {
            return CompletableFutureUtil.exceptionallyFuture(e);
        }
    }

    @Override
    public InputStream read(BlobId blobId) {
        return new ByteArrayInputStream(retrieveStoredValue(blobId));
    }

    private byte[] retrieveStoredValue(BlobId blobId) {
        return Optional.ofNullable(blobs.get(blobId))
                .orElseThrow(() -> new ObjectStoreException("unable to find blob with id " + blobId));
    }
}