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Let's first take a look at the legacy bank account class so you can see here that we collect the ID

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and the name of the person for which we are creating the bank account.

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And this this application here is sending this data to a service and a service will create the bank

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account for us.

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But now the service has changed and it requires a bit more information from apart from the ID and the

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name.

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So let's take a look at the service class here.

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You can see there is a bunch of variables here.

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We have ID, name, email and amount's.

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So basically we don't have this information.

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The legacy bank account application is not getting this information through the service.

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So basically, you need an adapter to adapt the new request.

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The actually the old request to to the new one, to the new service.

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So we will create a bank account adapter.

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And by doing the required information, the required extra information will be taken from personal info

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database class like we see here.

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So basically here we are, apart from the idea, we have all the information we need for the bank account.

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So we will take from the adapter.

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We will take inside the adapter.

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We will take those those info from the personal info DBI class.

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So basically, first of all, let's let's see the interface on which this bank account adapter is based

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on.

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We have a few operations here for getting the required information, for breaking the bank account and

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the adapter here implements this this interface.

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So as you can see here, we create a new legacy bank account, for instance, and also a deep connected

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instance.

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Both are needed because the legacy bank account will provide us the ID and the name, the information

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that is used to to provide in the past and the personal info database.

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It will provide the extra information that the new service for a congregation needs.

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And as you can see here, we have some letters and we get the ID and the name from the instance of the

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legacy bank account and the DBE Connector will get us the email and the amount.

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So you you may say that you can easily change this, but imagine that you have a very, very complex

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application of very complex client application, a legacy, one on which many, many systems are based.

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So you won't want to change this this application, because you may introduce issues, you may introduce

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bugs.

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And also, it's not advisable to to change this.

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You may want to create an adapter to adapt this old application to the new requirements.

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So let's take a look in the atlas here.

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So we created a legacy bank account with this idea and this name.

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And I have commented this this line here, because as you can see, we actually create a service for

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a creation and we try to apply only to get the idea and to get name getters from the legacy bank account.

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And this won't work.

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This won't compile because there are missing parameters.

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So if we take a look again into account creation service, you will see that for the constructor.

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We need also the email address and initial amount for that bank account.

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So that's why I come into this out.

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So basically, we we also create a personal info database here.

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We sign the email address for this for the same person and also the initial amount.

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And what we are doing here is we create an adapter, for instance, of the adapter we supply to the

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adapters constructor, the legacy bank account and also the personal info database.

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And the account creation service will be created based on the information supplied by the bank account

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adductor.

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So as you can see here, account creation service will create the account.

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Also, there is no error in the lines above here.

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So basically we supply all the information that is required in the contract between the client and the

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service.

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So let's run this and you will see that we will get accounts has been created a line here.

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So this is this is working.

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But if we were to use the legacy bank account.

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It would have been difficult to get this working because we only supply it with only two parameters

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here.

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That's it for the adoptive father.

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Join me in the next story where we are going to discuss about the breach button.

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So see you in the next aureole.