com.facebook.buck.artifact_cache.FullyReadOnCloseInputStream.java Source code

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Here is the source code for com.facebook.buck.artifact_cache.FullyReadOnCloseInputStream.java

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/*
 * Copyright 2015-present Facebook, Inc.
 *
 * 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 com.facebook.buck.artifact_cache;

import com.facebook.buck.log.Logger;
import com.google.common.io.ByteStreams;

import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * An {@link InputStream} wrapper that fully reads the underlying stream on close. This is because
 * we need to fully read an InputStream for the corresponding connection to be reused.
 */
public class FullyReadOnCloseInputStream extends FilterInputStream {

    private static final Logger LOGGER = Logger.get(FullyReadOnCloseInputStream.class);
    private boolean closed = false;

    public FullyReadOnCloseInputStream(InputStream in) {
        super(in);
    }

    @Override
    public void close() throws IOException {
        if (!closed) {
            closed = true;
            try {
                ByteStreams.copy(in, ByteStreams.nullOutputStream());
            } catch (IOException e) {
                LOGGER.info(e, "Exception when attempting to fully read the stream.");
            }
        }
        super.close();
    }
}