src/main/java/com/amazonaws/kinesisvideo/internal/service/DefaultServiceCallbacksImpl.java [162:184]:
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    @Override
    public void initialize(@Nonnull final KinesisVideoProducer kinesisVideoProducer) {
        Preconditions.checkState(!isInitialized(), "Service callback object has already been initialized");
        this.kinesisVideoProducer = Preconditions.checkNotNull(kinesisVideoProducer);
    }

    @Override
    public boolean isInitialized() {
        return kinesisVideoProducer != null;
    }

    @Override
    public void createStream(@Nonnull final String deviceName,
                             @Nonnull final String streamName,
                             @Nonnull final String contentType,
                             @Nullable final String kmsKeyId,
                             final long retentionPeriod,
                             final long callAfter,
                             final long timeout,
                             @Nullable final byte[] authData,
                             final int authType,
                             final long customData)
            throws ProducerException {
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src/main/java/com/amazonaws/kinesisvideo/java/service/CachedInfoMultiAuthServiceCallbacksImpl.java [72:94]:
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    @Override
    public void initialize(@Nonnull final KinesisVideoProducer kinesisVideoProducer) {
        Preconditions.checkState(!isInitialized(), "Service callback object has already been initialized");
        this.kinesisVideoProducer = Preconditions.checkNotNull(kinesisVideoProducer);
    }

    @Override
    public boolean isInitialized() {
        return kinesisVideoProducer != null;
    }

    @Override
    public void createStream(@Nonnull final String deviceName,
                             @Nonnull final String streamName,
                             @Nonnull final String contentType,
                             @Nullable final String kmsKeyId,
                             final long retentionPeriod,
                             final long callAfter,
                             final long timeout,
                             @Nullable final byte[] authData,
                             final int authType,
                             final long customData)
            throws ProducerException {
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