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Apache HttpComponents Client
There is a newer version: 4.5.14
/*
 * ====================================================================
 * 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 *
 */

package org.apache.http.impl.conn;

import org.apache.http.annotation.NotThreadSafe;

import java.io.IOException;
import java.io.OutputStream;

/**
 * Internal class.
 *
 * @since 4.3
 */
@NotThreadSafe
class LoggingOutputStream extends OutputStream {

    private final OutputStream out;
    private final Wire wire;

    public LoggingOutputStream(final OutputStream out, final Wire wire) {
        super();
        this.out = out;
        this.wire = wire;
    }

    @Override
    public void write(final int b) throws IOException {
        try {
            wire.output(b);
        } catch (final IOException ex) {
            wire.output("[write] I/O error: " + ex.getMessage());
            throw ex;
        }
    }

    @Override
    public void write(final byte[] b) throws IOException {
        try {
            wire.output(b);
            out.write(b);
        } catch (final IOException ex) {
            wire.output("[write] I/O error: " + ex.getMessage());
            throw ex;
        }
    }

    @Override
    public void write(final byte[] b, final int off, final int len) throws IOException {
        try {
            wire.output(b, off, len);
            out.write(b, off, len);
        } catch (final IOException ex) {
            wire.output("[write] I/O error: " + ex.getMessage());
            throw ex;
        }
    }

    @Override
    public void flush() throws IOException {
        try {
            out.flush();
        } catch (final IOException ex) {
            wire.output("[flush] I/O error: " + ex.getMessage());
            throw ex;
        }
    }

    @Override
    public void close() throws IOException {
        try {
            out.close();
        } catch (final IOException ex) {
            wire.output("[close] I/O error: " + ex.getMessage());
            throw ex;
        }
    }

}