Bulk-fetching emails in the new Gmail API

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Here is an example of batch request in Java where I get all the threads using threads ids. This can be easily adapted for your need.

BatchRequest b = service.batch();
//callback function. (Can also define different callbacks for each request, as required)
JsonBatchCallback<Thread> bc = new JsonBatchCallback<Thread>() {

    @Override
    public void onSuccess(Thread t, HttpHeaders responseHeaders)
            throws IOException {
        System.out.println(t.getMessages().get(0).getPayload().getBody().getData());
    }

    @Override
    public void onFailure(GoogleJsonError e, HttpHeaders responseHeaders)
            throws IOException {

    }
};

// queuing requests on the batch requests
for (Thread thread : threads) {
    service.users().threads().get("me", threads.getId()).queue(b, bc);
}


b.execute();

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